20W Hi-Fi Power Amplifier with TDA2040

This is a 20W Hi-Fi power amplifier circuit build based on single power amplifier IC TDA2040. The single TDA2040 has able to deliver 20W power output. The bridge amplifier which consist of double TDA2040 can deliver 30W power output (8 ohm loudspeaker).

20W Hi-Fi Power Amplifier with TDA2040 circuit diagram

About power amplifier IC TDA2040:

The TDA2040 is a monolithic integrated circuit in Pentawatt  package, intended for use as an audio class AB amplifier. Typically it provides 22W output power (d = 0.5%) at Vs = 32V/4W . The TDA2040 provides high output current and has very low harmonic and cross-over distortion. Further the device incorporates a patented short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A thermal shut-down system is also included.

PCB layout for this circuit:

20W Hi-Fi Power Amplifier with TDA2040 pcb layout

This circuit required split power supply, you may build this power supply circuit diagram to run your amplifier:

split power supply

There are more amplifier circuits with TDA2040 provided in TDA2040 datasheet.

Download the TDA2040 datasheet:


One thought on “20W Hi-Fi Power Amplifier with TDA2040

  1. TDA 2040 help

    Does TDA 2040 need a pre amp ,I want to connect to DTH audio output {sattelite reciever }.I have build a circuit ,but there is no sound yet .Do i need 2200 or 220micro F to my speaker ,pls reply.Thnks

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