Schematic Parts Part Total Qty. The circuit works best with 4 ohm speakers, but 8 ohm units will do. The circuit dissipates roughly 28 watts of heat, so a good heatsink is necessary. The chip should run cool enough to touch with the proper heatsink installed. The circuit operates at 12 Volts at about 5 Amps at full volume.
Lower volumes use less current, and therefore produce less heat.
Printed circuit board is preferred, but universal solder or perf board will do.