This is a Class D amplifier that I built based on the Texas Instruments chip TPA3122D2. I've created a suedo-class D using a 555 timer, but this thing is unbelievably cool. Less than 200 mA and you have to yell to hear yourself @ 16 volts. Wattage increases as the voltage increases. The max voltage is 30v, but I was using 16v caps, so I had to limit myself (I even blew one in the process). I definitely recommend this chip for small setups.