/diy/ - Do It Yourself

>>1196180
As I said, the 100µF caps are already on the amplifier board, you don't need more than that. The 100nF = 0.1µF caps are only for the stability of the voltage regulators and should be close to their IN, OUT and GND pins. The minimum voltage for the converter is specified as 10.8V. If you have 11V that should be ok. It's just enough for the 7809/7909 regulators that have a dropout voltage of about 1.5V at a low current. The idea is that the converter output is not iinitially loaded by the 100µF on the amp board but has already started up when the regulators begin to draw current. As always, RTFM (in this case the f*ing data sheet, see pic).

Important: 7809 and 7909 have a different pinouts. 7809 has IN-GND-OUT while the 7909 has GND-IN-OUT.