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30 Watts Audio Amplifier Schematic Circuit Diagram


A 30-watts audio amplifier circuit using TDA2040 is shown here. TDA2040 is a Class AB monolithic integrated audio amplifier available in Pentawatt package. The IC has low harmonic distortion, a low cross over distortion and has built-in circuitry for short circuit protection.

In the circuit, two TDA2040 ICs are wired in BTL (Bridge Tied Load) configuration in order to deliver 30W output into an 8-ohm speaker at +/-16V DC supply. Capacitor C1 is the input DC decoupling capacitor. The network comprising of components R2, C4, R3 provides feedback for IC1 while R7, C6, R8 network provides feedback for IC2. Network C5, R5, and C9, R9 provides high-frequency stability. Capacitors C2, C3 filters the positive supply rail while capacitors C7, C8 filters the negative supply rail.

30 Watts Audio amplifier circuit diagram

30 Watts Audio Amplifier Schematic Circuit Diagram


  • A well designed and good quality PCB will always improve sound quality.
  • Use +/-16V DC dual supply for powering the amplifier.
  • Heat sinks are necessary for IC1 and IC2.
  • The load can be an 8-ohm speaker.
  • C2, C7 must be rated 25V and other electrolytes can be 10 or 15V.
  • This amplifier’s setup must be done properly and without haste
  • Connect the Power Supply Unit (separately tested) to the Power Amplifier but not the Preamp: the Power Amplifier’s input must be left open.

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