I'm looking for a schematic diagram for a 20-watt power amplifier but unfortunately didn't find one. I will appreciate any help or recommendations from you guys. <meowth08>
A few years ago there were more than 100 car amplifier ICs made. Most produced 14W into a 4 ohm speaker just before clipping with a 13.8V supply but produced 20W when the supply voltage was about 16V. They are not made anymore.
Today there are a couple of amplifier ICs that produce 20W into 8 ohms, the LM1875 (Digikey has 24,000 in stock for $3.98 each) and the TDA2030A (Digikey has 3,500 in stock for $1.67 each).