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Voltmeter Ammeter | | Voltmeter Ammeter can measure voltage with 100mV and current up to 10A with 10mA resolution. It is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. | | |
ESR Meter / Transistor Tester / LC Meter | | ESR Meter / Transistor Tester / LC Meter kit is an amazing auto-ranging multimeter that automatically identifies and analyzes components being tested. It measures ESR values, capacitance (100pF - 20,000uF), inductance (10uH - 20H), resistance (0.1 Ohm - 20 MOhm), tests many different types of transistors such as NPN, PNP, FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. It also analyzes transistor's characteristics such as voltage and gain. It is an irreplaceable tool for troubleshooting and repairing electronic circuits. | | |
60MHz Frequency Meter / Counter | | Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. | | |
1Hz - 2MHz XR2206 Function Generator | | 1Hz - 2MHz XR2206 Function Generator produces high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Output of 1Hz - 2MHz XR2206 Function Generator can be connected directly to 60MHz Counter for setting precise frequency output. | | |
USB IO Board | | USB IO Board is a tiny spectacular little input / output development board featuring PIC18F2455 / PIC18F2550 microcontroller. When attached to a computer IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB IO Board is self-powered by USB port and can provide up to 500mA power for your projects. USB IO Board is breadboard compatible. | | |
Stereo FM Transmitter | | High quality BA1404 Stereo FM Transmitter with crystal clear stereo sound, excellent frequency stability and good transmission range. | | |
Audiophile Headphone Amplifier | | Audiophile headphone amplifier greatly improves the sound quality, adding three dimensional layered soundstage to any audio source whether it is your desktop computer, laptop, phone, MP3 player, Raspberry Pi, XBOX, SONY Playstation, etc. The kit uses high quality audio grade components such as Burr Brown OPA2132/OPA2134 opamp, ALPS volume control potentiometer, TI TLE2426 rail splitter, Ultra-Low ESR 470uF Panasonic FM capacitors, WIMA input and decoupling capacitors and Vishay Dale resistors. 8-DIP machined IC socket allows to swap opamp with many other chips such as OPA2227, OPA2228, dual OPA132, OPA627, etc. It's small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from single 9V battery. | | |
USB Voltmeter | | USB Voltmeter is a PC based dual channel voltmeter built around PIC18F2550 microcontroller that measures voltage from 0.00V up to 500.00V with 10mV resolution. USB Voltmeter sends measured data to PC via standard USB connection displaying data on a computer monitor. USB Voltmeter is self-powered drawing very little current from USB port. Voltage readings are displayed via included USB Voltmeter software. |
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USB 0-500MHz RF Power Meter | | USB 0-500MHz RF Power Meter allows to measure RF power of transmitters in dBm, Watts (nW, uW, mW and W range) and voltage. USB RF Power Meter is based on popular AD8307 watt power meter IC and PIC18F2550 microcontroller. Simply connect it to a PC via USB port and measurement readings will be displayed on a computer using included USB RF Power Meter software. Software settings can be configured to use 10-50dBm attenuator and thus allowing to measure higher RF power. |
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USB IO Board Stick | | USB IO Board Stick is a tiny spectacular input / output development board / parallel port replacement that can be used to control many different devices via USB port. It may also be used for data acquisition such as collecting data from sensors, buttons, voltage/current measurements, etc. It plugs right into computer's USB port so no USB cable is required. | | |
FM Transmitter | | Tiny FM Transmitter transmits audio through on-board microphone for up to 300 meters. Transmitter has high sensitivity microphone and good frequency stability. May be used as a bug, for room monitoring, baby listening, nature research, etc. Frequency is adjusted through variable coil. Comes with 9V battery clip. | |
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Micro SD MP3 Player | | Complete MP3 player that plays MP3 audio files stored on microSD memory card. New audio DAC chip supports microSD cards up to 128GB (FAT32 format), and provides excellent sound quality and base. | |
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500mW FM / VHF Transmitter Amplifier / Booster | | High performance low noise 500mW RF amplifier / booster kit for boosting output power all low power FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier chip is an integrated circuit containing multiple transistor stages and all other parts conveniently within a single small package. Boosting your FM transmitter has never been easier and the output signal can also directly drive 2n4427 or 2n3866 transistors for 1W or 5W of RF output power. |
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Latest Electronic Kits & Components | |
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BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPhone or a computer. 
XR2206 Function Generator produces high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated. Output frequency can be adjusted from 1Hz up to 2MHz. 
60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is a very useful bench test equipment for testing and finding unknown frequency of oscillators, radio receivers, transmitters, function generators, crystals, etc. It has excellent input sensitivity thanks to onboard amplifier.
 Build your own Special Edition Accurate LC Meter and start making custom made precision coils and inductors. Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. It can measure inductance starting from only 10nH - 1000nH, 1uH - 1000uH, 1mH up to 100mH and capacitance from 0.1pF up to 900nF. Accurate LC Meter is designed for professionals that require unprecedented measurement accuracy and includes high preci-sion components that are only found in premium quality kits. Control appliances wirelessly with 4-Channel RF Remote Control. Works through the walls with 200m / 650ft range. You can control lights, fans, garage door, robots, security systems, motor-driven curtains, window blinds, door locks, sprinklers or anything else you can think of.
 Voltmeter Amperemeter can measure voltage up to 70V with 100mV resolution and current up to 10A with 10mA resolution. It is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. The meter uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) and 16x2 green backlighted LCD display. Circuit design uses very few components and may be mounted on a small PCB. The meter can also be modified and calibrated through three buttons to measure voltage higher than 70V and current greater than 10A.
Posted on Wednesday, November 08, 2023
This little 88-108MHz FM transmitter has a range of up to 1 mile in the open. The transmitter consists of three stages. The first stage is an audio pre-amplifier built around 2SC9014 transistor, second stage is an oscillator built using 2SC9018 transistor, and third stage is an RF amplifier built around 2SC9018 transistor. RF amplifier stage increases an output power, range and stability by separating the antenna from the oscillator.
Posted on Tuesday, June 07, 2022
Simple circuit and easy to assemble DIY TDA7000 FM radio receiver with LM386 amplifier chip. Assembling an FM radio is always something interesting to the electronics enthusiast. TDA7000 which integrates a mono FM radio all the way from the aerial input to the audio output. Outside of the TDA7000 IC there is only one tunable LC circuit for the local oscillator, a few inexpensive ceramic capacitors and one resistor. The TDA7000 dramatically reduces assembly and post production alignment costs because only the oscillator circuit needs adjustment during manufacture to set the limits of the tuned frequency band. The complete FM radio can be made small enough to fit inside a calculator, cigarette lighter, key-ring fob or even a slim watch. The TDA7000 can also be used as receiver in equipment such as cordless telephones, CB radios, radio-controlled models, paging systems, the sound channel of a TV set or other FM demodulating systems.
Posted on Wednesday, May 04, 2022
Build your own fairly simple high quality stereo FM transmitter circuit as shown in the photo. The circuit is based on the BA1404 chip from ROHM Semiconductors and S9018 amplifier for extending tansmitter's range. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuits. The FM modulator can be operated from 76 to 108MHz and the power supply for the circuit can be anything between 6 to 12 volts.
Posted on Wednesday, April 13, 2022
I have gone without a variable lab bench power supply for too long now. The power supply that I have been using to power most of my projects has been shorted out too many times. I have actually killed 2 by accident and needed a replacement. I had many 18650 lipo batteries lying around my workshop so I decided to use them to build a portable variable bench power supply that could be easily moved around and used on the go. The power supply consists of DC-DC step up power module, voltage and current display, a switch, standard size 10K trim pots, XT-60 and a balance connector for charging an array of 8x4 18650 batteries.
Posted on Wednesday, March 30, 2022
1 Watt FM Transmitter amplifier with a reasonably balanced design specified to boost a RF frequency in the 88 – 108 MHz spectrum. It may be considered a fairly sensitive configuration when used with quality RF power amplifier transistors, trimmers and inductors. It involves a power amplification factor of 9 to 12 dB (9 to 15 times). At an input power of 0.1W the output may be well over 1W. It's advisable to choose T1 transistor on the basis of the input voltage. For 12V voltage it is recommended to use transistors such as 2N4427, KT920A, KT934A, KT904, BLX65, 2SC1970, BLY87. For 18-24V voltage may may want to use transistors such as 2N3866, 2N3553, KT922A, BLY91, BLX92A. You may also consider using 2N2219 with 12V input voltage however that would only produce an output power of around 0.4W.
Posted on Monday, March 14, 2022
Modern model railroads are digitally controlled using a Digital Command Control (DCC) protocol similar to network packets. These data packets contain device address and instruction set that is embedded in the form of AC voltage and fed to train track to control locomotives. The great advantage of DCC over analog DC control is that you can independently control the speed and direction of many locomotives on the same train track as well as control many other lights and accessories using that same signal and voltage. Commercial DCC decoders are available on the market however their cost can add up pretty quickly if you have a lot of devices to control. Luckily you can build a simple Arduino DCC decoder yourself to decode DCC signal and control up to 17 LEDs / accessories per each DCC decoder.
Posted on Tuesday, February 01, 2022
This is perhaps one of the simplest and smallest FM receivers for receiving local FM stations. It's simple design makes it ideal for a pocket sized FM receiver. The audio output of the receiver is amplified through LM386 amplifier chip that can drive a small speaker or headphones. The circuit is powered by three AAA or AA battery cells. FM receiver section uses two RF transistors for converting frequency modulated signals to audio. L1 coil and 22pF variable capacitor form a tuned tank circuit that is used for tuning to any available FM stations.
Posted on Thursday, January 20, 2022
This a build of a well known FM transmitter called Veronica. Transmitter was built on two separate boards. The first board (pictured above) is the Veronica transmitter itself with output power of 600mW when powered by 12V voltage or 1W when powered by 16V voltage. The second board is an RF power amplifier that uses 2SC1971 transistor to amplify Veronica's output signal to around 7 Watts. Although transmitter can be powered with 9-16V voltage, it is recommended that both transmitter and amplifier is powered by 12V voltage as 600mW is an upper limit for driving 2SC1971 transistor.
Posted on Monday, January 03, 2022
I had been fascinated with the idea of making simple stereo encoder for building Stereo FM Transmitter. Not that stereo means much to me away from the computer. I use an FM broadcast transmitter to relay the output of my computers to FM radios in the kitchen, the bedroom, the driveway, and out in the garden. Under those circumstances, I find that mono is plenty, whether it is music or radio programs from over the internet, since I am primarily occupied with something else anyway. When on my hands and knees in the garden, all the way up to my elbows in planting a bush, the music really does not seem any more sweet when its stereo. But that did not stop me from being fascinated with the idea of making a stereo encoder. Stereo always seemed like a lot of circuitry and bother for the slight benefit that came with it. That is, until a few weeks ago.
Posted on Friday, December 24, 2021
High sensitivity TEA5711 receiver allows the reception of distant stations from over 150 miles (240 km) away. Good selectivity is obtained with narrow bandwidth ceramic filters. AFC automatic frequency control locks on stations for drift-free reception. Stereo separation which depends on signal strength is very apparent on strong signals. And with high quality headphones, the sound is rich with deep base and high treble, for hours of enjoyable stereo music.
1Hz - 2MHz XR2206 Function Generator
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Presented here is a premium quality 1Hz - 2MHz XR2206 Function Generator kit capable of producing high quality sine, square and triangle waveforms of high-stability and accuracy. The output waveforms can be both amplitude and frequency modulated.
Coarse frequency adjustment is accomplished using 4-DIP switch for the following four frequency ranges; (1) 1Hz-100Hz, (2) 100Hz-20KHz, (3) 20KHz-1MHz, (4) 150KHz-2MHz. Frequency output can be fine tuned using P1 and P2 potentiometers. The kit includes output that can be connected to 60MHz Counter kit to measure output frequency. 1Hz - 2MHz XR2206 Function Generator kit includes premium quality components, including Audio Grade Capacitors, Gold Plated RCA Connector, WIMA Capacitors, 1% Metal Film Resistors and premium quality PCB with red solder mask and plated through holes.
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Special Edition Accurate LC Meter Kit
| Build your own Special Edition Accurate LC Meter (Inductance Meter / Capacitance Meter) and start making custom made precision coils and inductors. Accurate LC Meter allows to measure incredibly small inductance making it perfect tool for making all types of RF coils and inductors. It can measure inductance starting from only 10nH - 1000nH, 1uH - 1000uH, 1mH up to 100mH and capacitance from 0.1pF up to 900nF.
Special Edition LC Meter includes top notch high precision components that are only found in premium quality kits. It includes high quality double-sided printed circuit board (PCB) with red solder mask and pre-soldered tracks for easier soldering, detachable LCD display with yellow-green LED backlight, programmed PIC16F628A microcontroller chip, high precision capacitors and inductor, 1% Metal Film resistors, Machined IC Sockets, gold plated header pins, LCD header connectors and all the other components that are needed to build a premium quality kit. Thanks to the use of LCD connectors LCD display can be detached from the main PCB board at any time even after the kit has been assembled. All components are through-hole and are easy to solder. Special Edition Accurate LC Meter is designed for professionals that require unprecedented measurement accuracy and offers great value at low cost.
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10Hz - 60MHz Frequency Meter / Counter Kit
| This is 60 MHz Frequency Meter / Counter for measuring frequency from 10 Hz to 60 MHz with 10 Hz resolution. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. The meter provides very stable readings and has excellent input sensitivity thanks to onboard amplifier and TTL converter, so it can even measure weak signals from crystal oscillators. With the addition of prescaller it is possible to measure the frequency of 1GHz and above. The meter measuring range has been recently upgraded and it can now measure from 10Hz to 60MHz instead of 10Hz to 50MHz.
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PIC Volt Ampere Meter
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PIC Voltmeter Amperemeter can measure voltage 0-70V with 100mV resolution and current consumption 0-10A with 10mA resolution. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.
The meter uses PIC16F876A microcontroller with built-in ADC (Analog to Digital Converter) and 16 x 1 green backlighted LCD display. With slight modification it is possible to measure higher voltage and current.
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BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit
| Be "On Air" with your own radio station! BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit is an exciting transmitter that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground. Add 500mW FM / VHF Transmitter Amplifier / Booster for even longer range.
Special Edition BA1404 HI-FI Stereo FM Transmitter Kit includes premium components with audio grade gold capacitors, 1% Metal Film Resistors and quality PCB with Red Solder Mask and Plated-Through Holes. The kit is based on the popular BA1404 stereo broadcaster IC which contains all the complex circuitry for generating the stereo FM signal. 38 KHz crystal provides a rock solid stability of sub-carrier for stereo signal.
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USB IO Board with PIC18F2455/PIC18F2550 Microcontroller
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USB IO Board is a tiny spectacular little development board / parallel port replacement featuring PIC18F2455/PIC18F2550 microcontroller. USB IO Board is compatible with Windows / Mac OSX / Linux computers. When attached to Windows IO board will show up as RS232 COM port. You can control 16 individual microcontroller I/O pins by sending simple serial commands. USB Input / Output Board is self-powered by USB port and can provide up to 500mA for electronic projects. USB IO Board is breadboard compatible. Simply solder included 12-PIN & 8-PIN male headers on the bottom side of the PCB and the board can be plugged into a breadboard for quick prototyping.
These are examples of what can be built using USB IO Board:
 USB Relay Controller (turn ON/OFF lights or appliances in the house).
Control LEDs, toys, electronic gadgets, wireless control, etc.
USB LCD Controller
USB Volt / Ampere / Wattage Meter. USB CNC Controller
USB Data Logger
USB Temperature Meter / Logger
USB Thermostat
USB Humidity Meter / Logger
USB Digital RF Power Meter
USB Stepper Motor Controller
USB RC Servo Controller
and much more
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5W PLL Stereo FM Transmitter
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5W PLL Stereo FM Transmitter features PLL synthesized drift free operation with high quality BH1415 chip. 5W RF output power is achieved with 2SC1971 6W transistor in the output stage. Front panel digital control comes with LED display and case is made high quality aluminum. The board features EMI filtering on audio and power inputs and comes with Microphone and Audio inputs. Once transmitter is turned on it starts broadcasting with previously selected frequency. Overall this 5W PLL Stereo FM Transmitter provides professional broadcast audio quality and rivals commercial broadcasts.
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500mW FM / VHF Transmitter Amplifier / Booster
| This is a high performance low noise 500mW amplifier / booster for all low power FM transmitters such as BA1404, BH1417, BH1415, 433MHz transmitter modules, etc. The amplifier chip is an integrated circuit containing multiple transistor stages and all other parts conveniently within a single small package. Boosting your FM transmitter has never been easier and the output signal can also directly drive 2n4427 or 2n3886 transistors for 1W or 5W of RF output power.
SPECIFICATIONS
- Output Power: 500mW
- Input Frequency: 50MHz - 1300MHz
- Voltage Supply: 9-12V
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Phone FM Transmitter
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This Phone FM transmitter connects in series to your telephone line and transmits the telephone conversation over the FM band when you pick up the telephone handset. Transmitted signal can be tuned by any FM receiver. The circuit includes an "On Air" LED indicator and also provides a switch which can be used to turn off the transmitter. A unique feature of the circuit is that no battery is needed to operate the circuit since power is taken from the telephone line.
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Special Edition Accurate LC Meter Kit with Green Backlight LCD
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Build your own LC Meter and start making custom made coils and inductors. This LC Meter allows to measure incredibly small inductance making it perfect tool for making all types of RF coils and inductors. LC Meter can measure inductance starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitance from 0.1pF up to 900nF. The circuit includes an auto ranging and reset switch to make sure the readings are as accurate as possible.
This is a Special Edition LC Meter with upgraded top notch components. It includes upgraded high precision capacitors, inductor, 1% Metal Film resistors and Gold Plated Machined IC Sockets, header pins and LCD header connectors. This edition is designed for professionals that require unprecedented measurement accuracy.
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USB Relay Controller
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This is a new project USB Relay Controller that allows to control from eight to fifteen external devices through computer's USB port. You may control different appliances in your house such as lights, fans, garden sprinklers, computers, printers, TV sets, radios, music systems, air conditioners, fish tanks, or anything else you can think off, all conveniently through your computer. The software features iPhone based interface and it is fun to work with.
Stay tuned for more details ...
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BA1404 HI-FI Stereo FM Transmitter Kit
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Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
The circuit is based on the popular BA1404 stereo broadcaster IC which contains all the complex circuitry for generating the stereo FM signal. 38 KHz crystal provides a stable sub-carrier for the stereo signal. The oscillator circuit is stable enough for reliable reception even on digitally tuned FM radios. PCB includes green solder mask layer for easier soldering and protects wires that do not need soldering.
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Accurate LC Meter Kit
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ...
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DS18S20 Dual Temperature Meter
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This is extremely simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Meter can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit). Never before such a useful and powerful circuit could be built with so little components and yet provide endless possibilities. This is all possible thanks to the use of PIC16F628 microcontroller and 2x16 character LCD display that act like a small computer which can be customizable thanks to upgradeable hex firmware.
Presented PIC temperature meter uses two very exciting DS18S20 1-Wire digital temperature sensors. Unlike regular sensors where temperature readings are passed as varying voltage, DS18S20 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable.
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4-Channel Remote Control System with Four Relays
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Having the ability to control various appliances inside or outside of your house wirelessly is a huge convenience, and can make your life much easier and fun. RF remote control provides long range of up to 200m and can find many uses for controlling different devices around the house.
4 button RF remote is used to turn ON / OFF 4 different devices independently. 10A Relay outputs can switch appliances that use 110V / 220V mains voltage.
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RF Amplifier Remote Volume Control with Power Control, Input Source Selection and Speaker Protection
| This is very simple yet unique RF Amplifier Remote Volume Control based on PIC16F628 microcontroller that offers features that other remote volume controls do not.
1) Long Range Wireless 433MHz RF Radio Remote Control allows to control amplifier even through the walls
2) Allows to control audio volume with high quality Motorized ALPS Stereo Potentiometer
3) Allows to turn ON / OFF Audio Amplifier
4) Automatically turns ON speakers 2 seconds after the power has been turned ON to eliminate the power-on noise
5) Automatically turns Speakers OFF 1/2 second before power is disconnected to eliminate the power-off noise
6) Allows to switch input between two audio sources
More information will be available soon ...
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PIC Temperature Meter with Thermostat and Backlighted LCD
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This is our upcoming project that is similar to PIC Dual Temperature Meter but with the thermostat option built-in. Besides displaying customized temperature readings in Celsius and/or Fahrenheit degrees it will turn on heater if the temperature drops below specified temperature or it can be set to turn on the fan or air conditioning system if the temperature reaches above specified temperature that is set by UP / DOWN buttons. Thermostat can display both Celsius and Fahrenheit values (together or individually) and is capable of measuring temperatures from -55 to 125 degrees Celsius (-67 to 257 degrees Fahrenheit)
Presented PIC temperature meter with thermostat uses very exciting DS1820 1-Wire digital temperature sensor. Unlike regular sensors where temperature readings are passed as varying voltage, DS1820 passes temperature information in a digital format as data. This brings many new possibilities and enables to pass temperature information over much longer distances just over a two wire cable.
Stay tuned for full details on this project.
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RF Remote Control with Four Independent ON / OFF Relay Outputs
| This is a new project that uses four button RF remote control to turn ON / OFF four different devices independently. Any of the four outputs can be configured to work independently in either momentary or ON / OFF mode. Outputs are buffered by BC549 transistors and can drive devices directly or be connected to 5V / 12V Relays to turn ON / OFF appliances that use higher 110V / 220V voltage.
Remote control provides long range of up to 200m / 650ft and can find many uses for controlling different indoor and outdoor devices. We will be providing all components for building this project. Stay tuned for more information.
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24-Bit 192KHz PCM1793 Audio DAC
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24-Bit 192KHz PCM1793 DAC is perfect solution for upgrading audio components such as CD Player, DVD Player, Blue Ray Player, Computer, and Satellite receiver. It can be easily connected via Coaxial S/PDIF or Optical Cable and provides convenient analog output connectors. PCM1793 Audio DAC board features advanced Burr-Brown PCM1793 DAC chip, high quality OPA2134 op-amp, and latest DIR9001 digital line receiver. PCB board is built with high quality components such as Nichicon Audio capacitors, WIMA capacitors, gold plated connectors, gold plated PCB tracks and metal film resistors. PCM1793 DAC provides detailed heights and exceptionally good sound stage. |
A4 Power Amplifier
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As the stunningly original name suggests, the A4 contains 4 separate power amplifiers. This unit offers great flexibility - the following modes of operation are available: * Four-channel 50 watts per channel operation for surround-sound or multi-room operation. * Two-channel bi-amped mode, for suitably bi-wireable loudspeakers. * Two channel Bridged mode, offering around 150 watts per channel.
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8W PLL Stereo FM Transmitter with LCD
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Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16x1 LCD.
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LM3886 Power Amp with DIY Chassis
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This is a simple chassis using just 4 aluminum panels and 2 heatsinks. Designed around dimensions to tightly pack in a LM3886 chip amp kit.
The top and bottom panels sit in ridges cut into the heatsinks with a table saw, and then the front and back panels just bolt into the end fins. Rear panel fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held by M4 bolts tapped directly into the heatsinks so no additional brackets are required. Heatsinks are 75 x 160 x 50mm with a 10mm thick base.
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100W HiFi MOSFET Amplifier
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This is a high fidelity 100W MOSFET Amplifier. The benefits of using MOSFETs in the output stage is that they have a high input impedance at low frequencies, and are capable of extremely high slew-rates. This very attribute makes them rather prone to HF oscillation when improperly compensated, but with careful design they're capable of delivering an impressive performance.
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Dual Channel 70V PIC Voltmeter
| This is a sneak preview of upcoming PIC voltmeter project. You may use this PIC voltmeter for your power supply, as a battery meter for car, RC cars, RC helicopters, to monitor voltages in your computer or it could be used as a small portable voltmeter.
PIC voltmeter can measure 0-70 Volts which should be more than enough for most of electronic projects providing excellent reading accuracy and resolution. It has two input channels for measuring two voltage sources at the same time. This PIC voltmeter project uses PIC16F876 microcontroller with built-in ADC (Analog to Digital Converter) and 2x16 backlighted LCD display. Circuit design uses very few components and may be mounted on a small PCB. Stay tuned for more info.
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AVR Programmer
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This simple AVR Programmer will allow you to painlessly transfer hex program to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very short amount of time.
Entire AVR programmer has been build with using very simple parts and easily fits in the case of the serial connector. The socket pcb has been created to to fit a 28-DIP AVR Atmega8 microcontroller, but you can easily build a socket pcb for any other AVR microcontroller. This AVR programmer is compatible with a popular PonyProg that even shows you a status bar of the programming progress.
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BH1417 PLL Stereo FM Transmitter
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This is a high quality PLL Stereo FM Transmitter with build-in VHF amplifier with impressive transmission range. It is based on BH1417 chip that offers high quality crystal clear stereo transmission. Eight available frequencies are controlled by grounding 3 pins on header connector. This transmitter comes assembled and is ready to use.
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Single chip USB MP3 Player
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This MP3 player module is based on the latest innovative BU9432 chip from RHOM. It features USB 1.1 / 2.0 Controller, MP3 decoder, system controller for loading MP3 files form a USB flash drive, USB hard drive, USB CD-ROM or USB DVD-ROM drive all in one chip.
Once USB flash drive is connected, BU9432 automatically searches for MP3 files for playback. Audio is controlled by tactile buttons; Play, Stop, Previous Song and Next Song.
BU9432 can decode VBR MP3, MP2, MP1, Layer 1, 2, 3 files with Sampling rate: 8K - 48KHz and Bit rate: 8Kbps - 448Kbps. It can also recognize FAT16 and FAT32 USB flash drive / hard drive with capacity from 32MB to 2TBytes. Audio playback is exceptionally good with 93dB signal to noise ratio and 88dB dynamic range.
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BA1404 - HI-FI Stereo FM Transmitter Project
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This high quality stereo FM transmitter prototype is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.
The transmitter can work from a single 1.5V cell battery and provide excellent crystal clear stereo sound. It can also be supplied from two 1.5V battery cells to provide the maximum range.
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ELNA SILMIC II Audio Aluminum Capacitors Now Available
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The SILMIC II series are Elna's highest grade audio aluminum electrolytic capacitors that exhibit superior acoustic characteristics. An entirely new type of electrolytic separating paper is used, containing silk fibers. The extreme softness of silk can mitigate vibrational energy (generated by the electrodes, by external vibrations and by electromagnetic fields). Due to it's new electrolytic and foil design the signal propagation speed has increased (the ESR is reduced) and a more powerful, yet-mellow, sound is possible than before. When these capacitors were subjected to aural evaluations, the high range peak and midrange roughness were reduced substantially. Also, the low range richness and power were increased in the obtained high-quality sound.
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BH1415 HI FI Stereo Encoder with Limiter and Low Pass Filter
| This is the latest BH1415 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission.
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BH1417 HI FI Stereo Encoder with Limiter and Low Pass Filter
| This is the latest BH1417 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission.
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TDA7000 FM Receiver / TV Tuner / Aircraft Receiver
| This simple one chip FM receiver / TV tuner will allow you to receive frequencies from 70 up to 120MHz. With this small receiver it is possible to pick up TV stations, entire 88 - 108MHz FM band, aircraft conversation and many other private transmissions. It is a perfect companion to any FM Transmitter especially if FM band in your area is very crowded. TDA7000 receiver offers very good sensitivity therefore it will even allow you to pickup weaker signals that cannot be heard on conventional FM receivers.
A neat feature of presented TDA7000 FM receiver is a voltage controlled oscillator similar to TV tuners that are used in television sets ...
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Microcontroller Voltmeter / Ammeter with LCD
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This multimeter was designed to measure output voltage 0-30V and current with 10mA resolution in a Power Supply, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional function of the multimeter is that it can control (switch on and off) an electric fan used to cool the main heatsink. The power threshold at which the fan switches on can be adjusted using One Touch Button Setup.
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PCM2706 High Fidelity USB Soundcard / USB Headphones
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This is a high fidelity external USB Soundcard / USB Headphones project that can be built for your PC or Mac. It is based on the latest PCM2706 IC which functions as a high quality, crystal clear 16-BIT Stereo DAC. It is a single chip digital-to-analog converter that offers two D/A output stereo channels, digital S/PDIF output and requires very few external components. PCM2706 includes integrated USB 1.0 & USB 2.0 compliant interface controller and it is conveniently powered directly from USB connection. PCM2706 is a USB plug-and-play device and does not require any driver installation under Windows XP and Mac OSX.
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BH1417 Stereo PLL FM Transmitter
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This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL circuit that provides rock solid frequency transmission which means no more frequency drift, FM oscillator and RF output buffer.
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LCD Controllel Project
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This is our upcoming project where you will learn how to use your computer's parallel port to send text messages to two line 16 character LCD display. Once you will build PC to LCD interface which only requires a parallel port connector, cable and an LCD, you can set your imagination free and build a lot of interesting projects like car MP3 player, display date and time, weather information, and much more.
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Parallel Port Controller Project
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This is a very easy and fun to build project that will allow you to control up to eight external devices through your computer's parallel port. You may for instance control different appliances such as lamps, computers, printers, tv sets, radios, music systems, air conditioners, air fans, garden sprinklers and anything else you can think of, all through your computer.
In the future versions you will be able to program at what time a particular device should be turned on or off. If you should have any suggestions for any additional features please let us know.
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ICL7107 - DIGITAL LED VOLTMETER
|  This digital voltmeter is ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5 Digit LED display with a negative voltage indicator. It measures DC voltages from 0.1 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA. |
ICL7107 - DIGITAL LED AMPERE METER
|  Ammeter is a great addition to any Laboratory Power Supply as it will allow you measure the current consumption and help determine if there are any problems with the circuit that you are building or testing. This amper meter is capable of measuring the current consumption from 1mA up to 10A with selected 1mA, 10mA and 100mA resolutions, and consumes only about 25mA of current.
The ammeter is based on single ICL7107 chip and 3.5 Digit seven segment LED display. Due to a relatively small number of components that the circuit is using it is possible to fit it on a small 3cm x 7cm printed circuit board. |
New TX200 transmitter with optional PLL and stereo encoder
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Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around the house and yard. TX200 uses only two coils; one in the oscillator and the other one in the 200mW VHF amplifier so it should be fairly easy for anyone to build.
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Varicaps (Tuning Diodes)
|  New replacements for hard to find varicap diodes. These variable capacitance diodes change its capacitance as voltage is applied to them. They are perfect for tuning the frequency of PLL based FM transmitters, VCO FM Transmitters, FM / VHF receivers, TV tuners, etc.
MV2105 - 2-16pF varicap diode replacement for BB105 and BB205 varicap diodes.
MV2109 - 2-36pF varicap diode replacement for BB109, BB209 and BB405 varicap diodes.
MV104 - 2-42pF DUAL varicap diode replacement for KV1310, BB104, BB204 and BB304 varicap diodes.
Please refer to TX200 FM transmitter page to see examples on how you can implement varicap diodes in your own projects http://electronics-diy.com/tx200.php |
Very Accurate LC METER based on PIC16F84A IC
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Finding a "good" LC Meter (inductance / capacitance meter) that would accurately measure all inductor types and coils is not an easy task. We have been searching for this type of LC meter for a long time now. We have been considering many commercial LC meter versions, but most of them were either too pricey or limited in measurement ranges.
Finally, after studying different PIC16F84 based LC meter designs, a lot of testing and tweaking, we have came up with a unique design. The LC Meter is very compact and fairly simple to build. It's based on the PIC16F84A, LM311 ICs, and LCD module.
The heart of the meter is a PIC16F84A IC that performs LC calculations, and LM311 IC that functions as a frequency generator. The LC Meter can measure surprisingly small inductances; starting from 10nH, whole uH range and mH up to 100mH. It also measures capacitances starting from 0.1pF up to 900nF.
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Tunable RF Coils
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We will soon carry the following tunable RF coils that are perfect for precise frequency tuning of your transmitter. The magnet wire is halfway embedded within the plastic, providing excellent frequency stability. One of these coils have been tested in the TX200 transmitter as a substitution for an air coil and a variable capacitor. As a result the frequency stability was greatly improved. The coils are 7mm x 10mm and each comes with its own metal can, which may be removed. Tunable RF coils come in the following inductance ranges:
2.5 turns 48 - 59nH (Red)
3.5 turns 65 - 79nH (Orange)
4.5 turns 90 - 109nH (Yellow)
5.5 turns 109 - 132nH (Green)
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BA1404 Stereo FM Transmitter IC in stock
|  As of today we are starting the sale of the popular BA1404 IC which has integrated stereo encoder and FM transmitter, all in one package. We also carry 38KHz crystals so if you have been waiting to build your own stereo FM transmitter to transmit your music around the house, grab a schematic from the "Schematics" section and start building one today. |
PLL Module for your FM Transmitter
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For a fraction of price of the PLL transmitter kit you can build this small PLL module that will allow you to upgrade your existing FM transmitter to be; fully digitally tuned and to have rock solid frequency stability. The circuit is based on SAA1057 Philips frequency synthesizer, PIC16F84A microcontroller from PICMicro and 4MHz crystal.
The PLL module works amazingly well and connection to the FM transmitter is very easy. In fact it requires only four components; two varicap diodes, 100K resistor and 1-10pF capacitor. I will post a tutorial on how to connect this PLL module to the TX200 transmitter once I find some more time.
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Digital Voltmeter with 3.5 LCD Display
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Build an inexpressive 0.1 - 199.9V LCD digital voltmeter that can be easily configured as amper and temperature meter. This module is based on a popular ICL7106 IC that can measure its own voltage supply and offers very low power consumption.
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High quality PIC programmer
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This is the most attractive USB PIC Programmer that has great features in a compact design. It comes with a 40-pin ZIF (zero insertion force) socket, upgradeable firmware on PIC16F628 chip, ICSP (In Circuit Serial Programming), easy to use GUI software, and can program wide range of PICMicro microcontrollers.
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Control stepper motor through your computer's parallel port
|  Build an easy stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer's parallel port.
The project comes with a program that has easy to use graphical interface, allows you to control the motor speed, direction in real-time and it also allows you to use and learn about different stepping methods, such as single stepping, high torque stepping and half stepping modes.
Stepper motor controller also displays an animation that helps you visualize the current as it flows through individual coils. It is a wonderful tool to learn how stepper motors work. |
HI-FI NJM2035 Stereo Encoder
|  This stereo encoder is the perfect for those looking for a high quality stereo sound transmission at a low cost. This stereo encoder produces an excellent crystal clear stereo sound and very good channel separation that can match with many more expensive stereo encoders available on the market. This is all possible thanks to NJM2035 chip and 38KHz quartz crystal that controls the 19kHz pilot tone. You will never have to calibrate or re-adjust the circuit's frequency. |
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Digital ON-OFF Tactile Button Relay Switch |
Small circuit, with which we can use to get rid of the standard switch and operate any type of load with a push of a tactile button. Voltage between 5 and 18 V DC ( depends on the operating voltage of the relay coil ) in terminal CN1. Output Current is 10A ( depends on relay contacts ) in terminal CN3 activated by external positive pulse or short-circuiting the terminal CN2. Circuit is protected against double pulses and rebounds.
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88-108Mhz FM Preamplifier |
This VHF amplifier working on Band 2 Radio Spectrum tuning approximately 88 - 108 Mhz
The Preamplifier circuit uses two 2N3819 FET's in cascade configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realizing full high frequency gain. The bottom FET is tunable allowing a peak for a particular station.
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Frequency Meter 10Hz - 1300MHz |
This is 7-digit frequency meter measuring frequency from 10 Hz up to 1300 MHz. It is based on ideas of PIC16F84 based frequency meter.
The measuring range is divided into two subranges: 10Hz - 25MHz and 25 MHz - 1300MHz. The decimal point is after MHz digit, but can be set at any position.
It contains:
* PIC 16F84
* 74HC137 (BCD -> 1 of 8 decoder)
* SAB6456 VHF-UHF divider by 256
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ESR METER: Equivalent Series Resistance Capacitor Tester |
The project came from an italian magazine Nuova Elettronica N212. It's very simple but interesting ESR Meter. I've built it and tested some capacitors and it's very useful.
It measures the ESR (Equivalent Series Resistance) of capacitor (electrolytic and not) that s used to tell if a capacitor is good or not. ESR Meter uses a bridge circuit that works at 100KHz.
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Stereo Limiter |
Stereo Broadcast Limiter Circuit for Ramsey.
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Current Sensor |
High-wattage appliances like
electric irons, ovens and heaters
result in unnecessary
power loss if left ‘on’ for hours unnoticed.
Here is a circuit that senses the
flow of current through the appliances
and gives audible beeps every fifteen
minutes to remind you of power-’on’
status.
This is a non-contact version of current
monitor and can sense the flow
of current in high-current appliances
from a distance of up to 30 cm . It uses
transistors in the input to provide very
high input impedance (1.5 T-ohms),
very low input current (10 pA) and
high-speed switching performance.
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Thermal Fan Controller |
The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. I designed this circuit to use 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so a small power transistor will be fine as the switch. I used a BD140 (1A, 6.5W), but almost anything you have to hand will work just as well.
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300 MHz Prescaler |
A preamp that drives the CMOS counter input and a divide by 10 prescaler to extend the range of A Little More Serious Frequency Meter. The MCT10280 prescaler can be set to divide by 80, 40, 20, or 10, as a function of which pins are tied to the power supply. I set this one to divide by 10 since it is adequate for my needs, and the mental calculation of multiplying the meter reading by 10 is not taxing. ...
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4 Channel Stereo Audio Selector |
The add-on circuit presented here is useful for stereo systems. This circuit has provision for connecting stereo outputs from four different sources/channels as inputs and only one of them is selected/connected to the output at any one time.
When power supply is turned ‘on’, channel A (AR and AL) is selected. If no audio is present in channel A, the circuit waits for some time and then selects the next channel (channel B). This search operation continues until it detects audio ...
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6 Channel Audio Mixer |
The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor.
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Arduino Sinewave Generator |
Arduino Sine wave Generator using the direct digital synthesis Method.
Here we describe how to generate sine waves with an Arduino board in a very accurate way. Almost no additional hardware is required. The frequency range reaches form zero to 16 KHz with a resolution of a millionth part of one Hertz! Distortions can be kept less than one percent on frequencies up to 3 KHz. This technique is not only useful for music and sound generation another range of ...
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100 Seconds Duration On Switch with Touch Control |
This is a touch control switch which keeps the circuit on about 100 seconds after touching the plate connected to the 2 numbered pin. At the end of this time duration, relay releases and the circuit gets to off position.
The impedance of the trigger input of the 555 timer IC is very high and the inductive voltage on the human body is enough to trigger it. The circuit works based on this principle. You can use a piece of metal ...
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Publish Your Circuit |
Would you like to have your circuit published on electronics-diy.com?
Make it available to the world now. All credits will be yours and we will list your name, e-mail address and your website URL if you have one.
Submit Project
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Let us know how we can better serve you or what electronic projects or kits you would you like to see at Electronics-DIY.
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