8 Watt Audio Amp

Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.

Schematic

LM383 Pinout

Parts

Part Total Qty. Description Substitutions C1 1 10uf Electrolytic Capacitor C2 1 470uf Electrolytic Capacitor C3 1 0.1uF Disc Capacitor C4 1 2000uf Electrolytic Capacitor 2200uF R1 1 2.2 Ohm Resistor Anything Within 10% R2 1 220 Ohm Resistor Anything Within 10% IC1 1 LM383 8 Watt Amp IC ECG1232, TDA2002

Notes

1. IC1 MUST be installed on a heat sink.
2. C3 is for filtering and to prevent oscillation and should not be omitted.
3. The circuit can be built on a perf board, universal solder board or PC board, the PC board is preferred. I built the circuit on a perf board and had to add a low value inductor at the input to prevent oscillation.
4. The circuit draws about 880 ma at 12 V.
5. By swapping the values of R1 and R3, you can turn this amplifier into a guitar amp with no preamp required.
6. If you can't find 2000uF, then replace C4 with a 2200uF unit.
7. If you add a 0.2uF capaciitor in series with a 1 ohm resistor to the output you can prevent oscillation of the circuit under certain conditions.
8. Thanks to James Maloway for redrawing the schematic. The mew image is much easier to read then the old one.