2 layer board of 3.24x2.50 inches (82.22x63.50 mm). An approx. 10 Watt mono class D bass guitar amplifier for driving an 8-ohm speaker. The power amp is based on a TPA3125 chip. A 12-volt power supply capable of delivering at least 1 amp (preferably more) is required. Use a decent quality power supply. I found the cheap power supplies to be too noisy.