Wednesday, February 1, 2023

A Simple Audio Amplifier With Dual Power Source

By: S.C. Dwivedi

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This simple audio amplifier can be built at home with few components. You can use it at home or in a car with the 12V car battery as power source. The author’s prototype is shown in Fig. 1 while the circuit diagram is shown in Fig. 2.

Fig. 1: Author’s prototype on a breadboard
Fig. 1: Author’s prototype on a breadboard

The circuit comprises step-down transformer X1, bridge rectifier BR1, 12V voltage regulator IC LM7812, amplifier IC LA4440, 20W loudspeaker LS1, and few other components. Capacitors C1 and C7 connected across the supply terminals are used to minimise ripples/noise signals.

Download PCB and Component Layout PDFs: click here

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This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s December 2022 Issue–print or ezine edition.


S.C. Dwivedi is an electronics enthusiast and circuit designer at EFY

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