400W RMS stereo power amplifier circuit

This is a schematic diagram of a 400W RMS stereo amplifier operating using power transistors. This amplifier, in addition to providing good sound power, has excellent quality and high fidelity with low noise. To get 400 watts we can place 2 speakers of 4 ohms or 4 speakers of 8 ohms. This circuit requires a symmetrical power supply.

400W RMS Stereo Power Amplifier Parts List

transistor:

D1047 – 4

B817E – 4 pcs.

A1015 – 6 pcs.

TIP41C – 4 pcs.

TIP42C – 4 pcs.

Resistor:

6.8 ohms – 1W (blue, gray, gold) – 4 pieces

100 ohms – 1W (brown, black, brown) – 4 pieces

18K – 1 / 2W (brown, grey, orange) – 4 pieces

1K – 1 / 2W (black brown, red) – 2 pieces

10 Ohm – 1W (Brown, Black, Black) – 4 pieces

270 Ohms – 1/2W (Red, Purple, Brown) – 2 pieces

10K – 1 / 2W (brown, black, orange) – 2 pieces

330 Ohms - 1/2W (orange, orange, brown) - 2 pieces

56 Ohm - 1/2W (Green, Black) - 2 pieces

27 Ohm - 1W (Red, Purple, Black) - 2 pieces

820 Ohms - 1/2W (Grey, Red, Brown) – 2 pieces

0.47 Ohm – 5W – 8 items

Capacitor:

0.1uF/100v – 4 pcs

47uF/63v – 2 pcs

2.2uF/100v – 2 pcs

330pF (ceramic) – 2 pcs.

4700uF/63v – 2 pcs

Different kinds:

Diode 1N4004 – 10 pcs.

Diode P600J – 4 pcs.

2 10 turn coils with 1/4 copper core18.

7 amp 33x33v transformer – 2 pcs

400W RMS stereo power amplifier top PCB design

Power supply schematic for 400W RMS stereo power amplifier

The power supply circuit is very simple, you can use a 10A transformer and a 6800uf capacitor. The diode value refers to the current value coming from the transformer, it should have a higher value. For example, if you use a 7A transformer, use a 10A diode.

Input connection with volume control

This is the input connection for a 400W RMS stereo power amplifier using a stereo potentiometer for volume control.