This very usefull circuit is based on two IC:

TDA1524A: balance, volume, treble, bass variable stereo preamplifier integrated cicruit, provided from a TV out of order and powered by 12V.

TDA2009: power amplifier also from a TV out of order.

The power amplification provided is two channel 10W+10W, the effective output power is >10W RMS with a 4ohm load and 24V power supply; it is >6W RMS with 8ohm loadand 24V; it is >4RMS with 4ohm load and 12V. The power supply should give from 12V to 24V voltage and from 1A to 2A current. The frequency response is from 10Hz to 50KHz at -3dB. The signal noise ratio is 75dBA re.10 W output.The total gain is 40dB. It is reccomended to place good thermal dissipation to the power amplifier IC if its current absorption is > 1A.

audio amplifier

The schematic above is designed to make easier the components insertion in a multi hole PCB board of 39X20 holes dimension; each cross lines in the paper corresponds to one hole in the PCB.