Audio

The audio signal is taken from the motherboard headphone output, it passes through the volume potentiometer, and finally it arrives to the power amplifier located at the top.

The small circuit shown in the upper left of the next picture, is the driver of the marquee fluorescent: it has nothing to do with audio. Also it didn't work fine and I had to replaced it with a different one.

The power amplifier delivers 15Wx2 using 4ohm speakers (the usual type in car-audio).