I am using this cheap amplifier board at 12v with Arduino, for sound effects in my truck:
It works good. When my project wakes from sleep mode, I would like to toggle a transistor to power the 12v power source for the audio amplifier. I believe it may peak at 2 amps, 18 volts - however, the battery will probably only provide up to 14.4 volts.
The 2n2222 transistor I tried seems to distort the audio, and is not strong enough to provide the full power to the audio amp.
Can someone advise a better more efficient mosfet or other circuit? I have tip-120's that handle 5 amps, I was going to use. They probably are not efficient with the power, but the device should not be on when the vehicle is idle, to avoid draining the battery (as I have found in my previous projects).