HOME     STORE     BLOG     SCHEMATICS     TUTORIALS     DOWNLOADS     CONTACT

Amp Miniature Audio Amplifier
 
Amp Miniature Audio Amplifier


 

Amp Miniature Audio Amplifier

 


The small AF amplifier Suitable for laptops and MP3 players. IT may be powered from the PC (Game or USB) or AC adapter.The basis of the amplifier is an integrated circuit TDA2822M. With this circuit you can build an amplifier with output up to 2x 1 W. This high power circuit is only able to supply at peak times, when excited, would be permanently unable to work. Involvement of the amplifier is to figure 1. The input signal passes through frequency-dependent volume control on the divider. Frequency-dependent divider produces frequencies around 100 Hz, with a positive influence on the subjective sound quality when using small speakers. IO is the involvement of manufacturers' recommendations. The amplifier output can connect speakers with an impedance of 8 ohms (or greater), or headphones. IO supply voltage can be in the range of 1,8 to 15 V. The low supply voltage power amplifier is very small, at high supply voltage and load speakers with low impedance circuit may be a little overheated. With 8 ohm speakers are suitable voltage in the range of 6-9 V. I used to supply voltage 5 V, which are derived from the game port. Voltage of 5 V can be obtained even from the keyboard connector, PS / 2 port and USB. A better option is a network adapter, there are no problems with earth loops.


Amp Miniature Audio Amplifier

The pages of professional journals have been published for several amplifier suitable for the PC. Authors are usually trying to maximize performance. When gaming or watching movies will enhance the overall quality audio experience. For routine work on the PC, when you need only listen to messages about a particular program is a power amplifier watts wasted tens of luxury. Hereinafter described amplifier with low power can be connected to any PC with audio output. Can be powered directly from a PC without having a computer in any way.



The amplifier is built on a printed circuit board according to Figure 2 and 3. SMD resistors and capacitors are mounted on the circuit, other components are solder normally. Disk is in a box KM27 laced a headphone jack and a potentiometer bracket to the side of the box. In the absence of other suitable connectors for connecting the speakers I use RCA connectors. To connect the input signal can be used jack 3.5 mm (the box is not fit) or cablet connector. For this amp I used a 4-wire shielded cable. Two cores are used for audio signal is the residual supply voltage. Supply voltage is taken from the game port on the first pin Ground wire (0 V) is connected to the fourth pin Current connections to the country konktoru game port and audio output from the PC establishes the involvement of ground loop, the realized sample, however, does not add any distracting.



The amplifier I made a miniature speaker cabinets that I planted a Speaker 57 mm diameter of the PC boxes. Although I was picked from eight pieces, I found two applicable. About half of them were scrubbed, the rest had each a different color sensitivity and other audio. I finally finished boxes have already used the miniature speakers with a plastic membrane purchased GES in the store. Best would be to use the medium to larger elliptical speakers with Alnico magnet (small round), which have a low stray field. These can sometimes get reprodukrory in selloffs or can Now unscrew the old television sets.



Amplifier, we will renew preferably with an external source, just as "Flat" battery. It is important that the power supply should never short-circuit. Collection of load should be up to 5 mA, when excited, then to 200 mA (at 5 V supply). Involvement has no guile, and it should work on the first circuit. The amplifier can also be used in conjunction with a Walkman or Discman. In this case, the need for an external power source - battery or AC adapter.



Miniature speakers I swapped for a bigger litter box with elliptical speakers (used for TV) with much better sound. The original "correction" emphasizes low frequencies, then stopped suit. Figure 4 is a modified engagement, changes are marked in red. In Figure 5 is a frequency response of the low frequencies before and after treatment.



BOM components



R1, R2, R5, R6 22 Ohm (SMD 1206)
R3, R4 2.2 Ohm (SMD 1206)
R7, R8 4.7 Ohm (SMD 1206)
P1 4.7 Ohm, potentiometer logarithmic stereo Radiohm
C1, C2, C7, C8, C9 100 nF (SMD 1206)
C3, C4 100 μF/10 V
C5, C6 470 μF/10 In
C10 In 1947 μF/16
IO TDA2822M
connector 3.5mm stereo jack socket SCJ-0354-5PU
Connectors 2x RCA
connector 3.5mm stereo jack plug
connector CANNON 15M
box KM27
shielded cable
PCB bcs37


Amp Miniature Audio Amplifier


Amp Miniature Audio Amplifier


Amp Miniature Audio Amplifier

Amp Miniature Audio Amplifier





Accurate LC Meter Capacitance Inductance Meter with 16F628 and LCD
Volt Ampere Meter with 16F876 Microcontroller and LCD display
 
Accurate LC Meter

Build your own Accurate LC Meter (Capacitance Inductance 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 and inductors. 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 as well as reset switch and produces very accurate and stable readings.
PIC Volt Ampere Meter

Volt Ampere Meter measures voltage of 0-70V or 0-500V with 100mV resolution and current consumption 0-10A or more 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 16x2 backlighted LCD.

50MHz 60MHz Frequency Meter / Counter with 16F628 & LCD
1Hz - 2MHz XR2206 Function Generator
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.

BA1404 HI-FI Stereo FM Transmitter
USB IO Board PIC18F2455 / PIC18F2550
BA1404 HI-FI Stereo FM Transmitter

Be "On Air" with your own radio station! BA1404 HI-FI Stereo FM Transmitter broadcasts 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.
USB IO Board

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 IO Board is self-powered by USB port and can provide up to 500mA for electronic projects. USB IO Board is breadboard compatible.

ESR Meter / Transistor Tester Kit
Audiophile Headphone Amplifier Kit
 
ESR Meter / Capacitance / Inductance / Transistor Tester Kit

ESR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, 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 equipment by determining performance and health of electrolytic capacitors. Unlike other ESR Meters that only measure ESR value this one measures capacitor's ESR value as well as its capacitance all at the same time.
Audiophile Headphone Amplifier Kit

Audiophile headphone amplifier kit includes high quality audio grade components such as Burr Brown OPA2134 opamp, ALPS volume control potentiometer, Ti TLE2426 rail splitter, Ultra-Low ESR 220uF/25V Panasonic FM filtering capacitors, High quality WIMA input and decoupling capacitors and Vishay Dale resistors. 8-DIP machined IC socket allows to swap OPA2134 with many other dual opamp chips such as OPA2132, OPA2227, OPA2228, dual OPA132, OPA627, etc. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.
 

Arduino Prototype Kit
RF Remote Control 433MHz Four Channel
 
Arduino Prototype Kit

Arduino Prototype is a spectacular development board fully compatible with Arduino Pro. It's breadboard compatible so it can be plugged into a breadboard for quick prototyping, and it has VCC & GND power pins available on both sides of PCB. It's small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket. Board features 28-PIN DIP IC socket, user replaceable ATmega328 microcontroller flashed with Arduino bootloader, 16MHz crystal resonator and a reset switch. It has 14 digital input/output pins (0-13) of which 6 can be used as PWM outputs and 6 analog inputs (A0-A5). Arduino sketches are uploaded through any USB-Serial adapter connected to 6-PIN ICSP female header. Board is supplied by 2-5V voltage and may be powered by a battery such as Lithium Ion cell, two AA cells, external power supply or USB power adapter.
200m 4-Channel 433MHz Wireless RF Remote Control

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 / 650ft and can find many uses for controlling different devices, and it works even through the walls. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of.
 

Electronics-DIY.com © 2002-2024. All Rights Reserved.