This Stereo Amplifier Is Simple To Make

By Raj K. Gorkhali

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Here is a simple stereo amplifier you can make with a CD6283 audio amplifier and a few passive components. It provides an output of 4.6 watts per channel with a 12V power supply.

Circuit diagram of the stereo amplifier is shown in Fig. 1. CON1 is the connector for 6-12V input power supply, CON2 is for the input signal and CON3 provides the output to two speakers that may be connected to it.

Circuit diagram of the stereo amplifier
Fig. 1: Circuit diagram of the stereo amplifier

Pins 5 and 7 of IC1 are connected to CON2 for audio inputs via capacitors C2 and C3, respectively. Pin 12 is connected to CON1 connector for power supply. Pin 2 of IC1 is connected to left (L) channel output via electrolytic capacitor C10 and pin 10 of IC1 is connected to right (R) channel output via electrolytic capacitor C9. A 4-ohm, 4-watt speaker each is connected at CON3 for left and right channels, respectively.

Construction and testing

A PCB layout for the amplifier is shown in Fig. 2 and its components layout in Fig. 3. After assembling the circuit on the PCB, connect a 6-12V power supply across CON1.

PCB layout for the stereo amplifier
Fig. 2: PCB layout for the stereo amplifier
Components layout for the PCB
Fig. 3: Components layout for the PCB

After completing the wiring, connect left (L) and right (R) stereo audio inputs from a mobile/laptop/desktop at CON2. Then connect the speakers at CON3. Take a 6V or 12V battery and connect it to the amplifier circuit.

You can calibrate the circuit by connecting a signal generator (set at 1 kHz) to left and right inputs at CON2. You should hear a loud amplified tone from left and right speakers at the output. You can also use an MP3 player instead of signal generator to calibrate the circuit.
Optional 22-kilo-ohm potentiometers can be connected at CON2’s left and right inputs for volume control. Your amplifier is ready to use!

Author’s prototype for Stereo Amplifier
Fig. 4: Author’s prototype for Stereo Amplifier

Raj K. Gorkhali is a hobbyist and a regular contributor to EFY

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