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.

 Accurate LC Meter

 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.

 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.

 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 includes 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.

  Latest Electronic Kits & Components
Special Edition Accurate LC Meter Kit with Green Backlight LCD - FREE CASE
60MHz Frequency Meter / Counter Kit - Green Backlight LCD
1Hz - 2MHz XR2206 Function Generator Kit
Voltmeter Ammeter Kit
BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit
USB IO Board Kit
Mini Spy Microphone
Mini FM Transmitter
40 PIN Machined Break Away Male Header Connector
1x4 Female Header Connector
3-32V to 5-35V 4A Adjustable DC to DC Step Up Power Converter
USB to Serial Arduino Programmer
76MHz - 110MHz FM Transmitter with Booster
ICL8038 - Precision Waveform Generator
10K ALPS Stereo Audio Potentiometer
2200uF 10V Panasonic FM Capacitor
1000uF 10V Panasonic FM Capacitor
100uF 25V Panasonic FM Capacitor
220uF 25V Panasonic FM Capacitor
1000uF 6.3V Panasonic FM Capacitor
47uF 25V Panasonic FM Capacitor
22uF 50V Panasonic FM Capacitor
3300uF 16V Panasonic FM Capacitor
2200uF 6.3V Panasonic FM Capacitor
2200uF 16V Panasonic FM Capacitor
4700uF 6.3V Panasonic FM Capacitor
470uF 16V Panasonic FM Capacitor
100uF 50V Panasonic FM Capacitor
1000uF 16V Panasonic FM Capacitor
40 PIN Machined Break Away Female Header Connector
Miniature 3.5mm Stereo Audio Jack - PCB Mount
PCB for Audiophile Headphone Amplifier
Arduino Prototype Kit
1A USB LIPO Battery Charger
12V 27A Alkaline Battery
Laser Module - 5mW 650nm Red
ENC28J60 Ethernet Controller
Barometric Pressure & Temperature Sensor - BMP280
RJ45 Ethernet Jack
3.5mm Stereo Audio Jack - Panel Mount
Audiophile Headphone Amplifier Kit
USB IO Board Stick Kit
Jumper - 2 PIN
3.3V 250mA Ultra Low Noise LDO Voltage Regulator
Murata EMI Noise Suppression Filter
4-Channel 315MHz Wireless RF Remote Control (Transmitter + Receiver)
1x8 Female Header Connector
1x6 Female Header Connector
EasyDriver Stepper Motor Driver
25MHz Ceramic Resonator
Mini Tactile Switch (Pack of 2)
Ultrasonic Distance Measuring Sensor - HC-SR04
3.3V SMD Voltage Regulator
128x64 OLED Display
1-5V to 5V DC to DC Step Up Power Supply Board
Micro USB Female Connector Type B

 more electronic kits

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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.





























Analog Capacitor ESR Tester

Posted on Wednesday, November 16, 2016


I finally got round to making my capacitor ESR tester this week after finding a nice simple 5 transistor version. Unfortunately, for me, the design was only SMD so, I decided to replicate his schematic in Eagle PCB using a through hole component design. I will not be going into much detail regarding ESR or Equivalent Series Resistance Meters as, there is already plenty of other sources of information on the subject. Yet, every tinkering knows capacitors are guilty of a lot of sins in electronics. Capacitors love to throw red herrings! They can appear physically fine (no bulge), show good capacitance and hide in circuit, standing to attention like the Queens Guards hiding shorts and high resistance under their big hats. This is where the ESR tester can be a saviour, with the ability to test for "out of specification" high resistance, within the capacitor. They can also be used to test "in circuit", without the need to remove every capacitor in the circuit.



300mW FM Transmitter with 2SC2538

Posted on Sunday, October 30, 2016


The above FM transmitter has RF output power of 300 mW and covers more than one kilometer distance. Frequency adjustment is accomplished with MV2105 varactor diode and R7 10K potentiometer. 2SC2538 is a class C 300mW amplifier.



500mW FM / VHF Transmitter Amplifier / Booster

Posted on Monday, October 24, 2016


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 2n3866 transistors for 1W or 5W of RF output power.



15W Transmitter Power Amplifier 88-108MHz

Posted on Friday, October 21, 2016


The power amplifier boosts 88-108MHZ 1-2W FM transmitter's power to 15 W. It includes multi-level low pass filter and has a high conversion efficiency with strong Yi-wave suppression. With good antena expected transmission coverage is at least 15Km. It uses high power 175 MHZ 4A 25W 2SC1972 RF transistor that must to be mounted to heatsink for proper heat dissipation.



DIY USB 5V Solar Power Pack

Posted on Friday, September 30, 2016


Solar energy is renewable, free, widely available and clean form of energy. It is considered as a serious source of energy for many years because of the vast amounts of energy that is made freely available, if harnessed by modern technology. Many people are familiar with so-called photovoltaic cells, or solar panels, found on things like spacecraft, rooftops, and handheld calculators. The cells are made of semiconductor materials like those found in computer chips. When sunlight hits the cells, it knocks electrons loose from their atoms. As the electrons flow through the cell, they generate electricity. In this project, we are building a power bank which harvests energy by using a solar panel. The energy gained by the solar panel is stored in a LiPo battery. Then the battery is used to supply a stable 5V which is used by USB gadgets. The power bank can also be charged by an external 5V source. The best thing for this power bank during day that you donít need to remember to charge it. It charges itself by using the sunlight and you donít come up with an empty bank.



ICL8038 Function Generator

Posted on Thursday, June 30, 2016


Function generator with adjustable frequency from 0 Hz to over 400 kHz, adjustable amplitude, DC offset, duty, and of course the function selection Ė square, triangle, and sine. Generator based on good old ICL8038 integrated chip generator that gives pretty good shaped signals as for amateur purposes. This circuit has been designed a little differently than ICLís note or other similar circuits are suggesting. I tested a bunch of different configurations with different peripherals and chosen the best Ė so to get good waveshape at 400kHz. I got rid of some of the elements, I added my own solutions. The two ICL chips that i have can oscillate around up to 420-430kHz, and practically we can get good waveforms up to that frequency.



2-5 Km Long Range FM Transmitter

Posted on Friday, June 24, 2016


The proposed long range transmitter circuit really is very steady, harmonic free design which you can use with standard fm frequencies between 88 and 108 MHz. This will likely encompass 5km spectrum (long range). It includes an extremely consistent oscillator for the reason that you employ LM7809 stabilizer that is a 9V stabilized power source for T1 transistor and for frequency realignment that may be reached by means of the 10K linear potentiometer. The output strength of this long range rf transmitter is approximately 1W. Transistor T1 is employed as an oscillator stage to present a small power steady frequency. To fine-tune the freq. apply the 10k linear potentiometer this way: should you moderate, in the direction of ground, the freq. would probably decrease but when you fine-tune it in direction of + it would climb. Essentially the potentiometer is needed just as a flexible power source for the a pair of MV2019 varicap diodes. Both of these diodes function as a changeable capacitor whilst you regulate the pot. By tweaking the diode capacitance the L1 + diodes circuit renders a resonance circuit for T1. Feel free to employ transistors similar to BF199, BF214 however be careful not to use BCs. At this point you donít receive yet the long range fm wireless transmitter due to the fact that the electric power is fairly reduced, a maximum of 0.5 mW.



0-30V Mini Bench Power Supply

Posted on Thursday, June 02, 2016


After many years of employing this ugly and clumsy bench power supply, I decided it was time to build something better, smaller and nice looking. It began as a variable power supply based on an LM338 5A voltage regulator and external power adapter. LM338's Data Sheet has several very helpful application notes and circuits. I chose one that illustrated variable output and included protection diodes. Diodes are included to protect the regulator from damage in case the input is accidentally shorted to ground. This is a distinct possibility if using jumpers to attach it to the power supply. Also the output of station supply may be shorted if some other device fails. Without the diodes, if this happens, the capacitors will dump their charge back through the regulator. Since the current spike may be many amps, the regulator may fail. The diodes steer the current around the regulator and into ground, thereby protecting it from damage. With adequate input the LM338 makes a fabulous variable power supply. This small supply is user friendly and fits nicely on my cluttered bench.



Pen FM Transmitter Bug

Posted on Friday, May 20, 2016


Pen FM Transmitter bug projects have been very popular. The idea of being able to hide a transmitter in a pen is very appealing. In an effort to reduce the size of this design, we have used surface-mount components. Firstly, the thought of using the coil in the tank circuit for transmitting RF was a little far fetched, but we used it as an example for those who were interested in experimenting with our circuits. Now we have gone back to a conventional antenna, the whip. The whip or straight-line antenna can be coiled, wound longitudinally or folded. The way it is wound makes a big difference to its effectiveness, but when you are limited in space, you have to accept these limitations. Even though we have used this antenna set up in our previous pen bugs we have considerably improved the circuit to the point were it has low battery consumption, but high RF output. The size of this design has been reduced considerably by using surface-mount components.



76MHz - 110MHz FM Transmitter with Booster

Posted on Monday, May 16, 2016


Three stage FM transmitter with an on board signal booster for increased transmitting range. It broadcasts audio on 76MHz - 110MHz FM frequency via included on board microphone or from MP3 player, Phone, iPod, Computer, Laptop, CD Player, TV, Satellite Receiver via on board 3.5mm connector. It transmit sound with excellent clarity throughout your home, office, yard, camp ground, etc. Transmitter is supplied by 3-12V DC voltage and uses one 2SC9014 and two 2SC9018 low noise RF transistors.



1Hz - 2MHz XR2206 Function Generator


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.




Special Edition Accurate LC Meter Kit

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.




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.




PIC Volt Ampere Meter



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.




BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit

BA1404 HI-FI Stereo FM Transmitter 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.




USB IO Board with PIC18F2455/PIC18F2550 Microcontroller

USB IO Board PIC18F2455/PIC18F2550

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.

USB IO Board PIC18F2455/PIC18F2550

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




5W PLL Stereo FM Transmitter


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.




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




Phone FM Transmitter


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.




Special Edition Accurate LC Meter Kit with Green Backlight LCD


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.




USB Relay Controller


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 ...




BA1404 HI-FI Stereo FM Transmitter Kit


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.




Accurate LC Meter Kit





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 ...




DS18S20 Dual Temperature Meter

DS18S20 Dual Temperature Meter

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.




4-Channel Remote Control System with Four Relays


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.




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 ...




PIC Temperature Meter with Thermostat and Backlighted LCD



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.




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.







24-Bit 192KHz PCM1793 Audio DAC



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


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.




8W PLL Stereo FM Transmitter with LCD


Very stable FM transmitter based on TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84 microcontroller. Frequency is displayed on 16x1 LCD.




LM3886 Power Amp with DIY Chassis


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.




100W HiFi MOSFET Amplifier


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.




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.




AVR Programmer



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.




Upcoming PIC Voltmeter Project

Soon we will post a PIC Voltmeter project with 2x16 LCD display that can measure dc voltage from 0 to 70V. PIC Voltmeter is using PIC16F876 microcontroller that features built-in analog to digital converter (ADC) and uses very few external components. Voltage readings are very accurate and this microcontroller based meter is a perfect addition to your laboratory power supply.




BH1417 PLL Stereo FM Transmitter



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.




Single chip USB MP3 Player



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.




BA1404 - HI-FI Stereo FM Transmitter Project


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.




SAA1057 PLL Frequency Synthesizer IC in Stock

We have just received a new batch of hard to find SAA1057 ICs. SAA1057 is a popular integrated circuit that is used as PLL Frequency Synthesizer in AM / FM transmitters.




ELNA SILMIC II Audio Aluminum Capacitors Now Available


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.




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.




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.




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 ...




Microcontroller Voltmeter / Ammeter with LCD


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.




PCM2706 High Fidelity USB Soundcard / USB Headphones


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.




BH1417 Stereo PLL FM Transmitter


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.




LCD Controllel Project


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.




Parallel Port Controller Project


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.




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



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.




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


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.




Tunable RF Coils


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)




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.




Designing your own Printed Circuit Boards

Designing your own PCBs is a huge convenience, and you can create a professionally looking PCB in a manner of hours, depending on the size and complexity of the project.

Electronics-lab has posted a nice article that shows you a step-by-step procedure on how to use Eagle Layout Editor <http://www.cadsoft.de/download.htm> to create a PCB design as well as Adobe Photoshop which you may use to create final touches and print it.




PLL Module for your FM Transmitter



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.




Testing and using Varicap Diodes in VCO oscillators

Here is another small tutorial on how you can test and use varicap diodes in the voltage controlled or PLL based FM oscillators.




Digital Voltmeter with 3.5 LCD Display


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.




High quality PIC programmer


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.




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.




New TX200 Transmitter



This is our newest TX200 transmitter. It is a highly improved addition to our TX500 and TX300 transmitter family. TX200 is a 200mW FM Transmitter that offers excellent frequency stability and improved sound quality.



It features an oscillator that is based on BF199 low noise transistor and high precision adjustable coil. TX200 also includes a BF199 based VHF amplifier that eliminates frequency drifts and boosts the strength of the RF signal to 200mW. In addition to that TX200 has also built in LED based RF meter that indicates the strength of the transmitted RF signal. The transmitter can be supplied with 6 to 12V and offers low power consumption. It can be used as a stand alone transmitter or connected to an external VHF power amplifier to achieve an even greater transmission range. When connected our stereo encoder kit, TX200 is converted into an affordable high fidelity stereo FM transmitter.




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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