Well, I somehow managed to build my first solid state amp, based on the TPA3116D2 chip. I used the schematic from the data sheet and it works and sounds great. The power supply is a 130 watt Dell laptop power brick putting out 19.5V. The chip barely gets hot driving 8 ohm speakers. Thanks to everyone who posts here for their ideas and inspiration, especially xrk971 and his great amp, that thread is what pushed me from building a chip amp to a cheaper, high efficiency class D. I scoped the output and the wave is smooth, into a resistive load you can barely see the switching on top of the sine wave. The purpose of the amp is to have something portable to take with me to the garage, basement, etc and it fits the bill quite nicely.
The only problem I ran into was with the output capacitors, I originally had cheap 50V caps in and they quickly smoked without a speaker load. I replaced them with the square 100V caps and all is well. I don't plan on running it without a load but it has to survive at least for a little while if a speaker wire pulls out or isn't connected.
The only problem I ran into was with the output capacitors, I originally had cheap 50V caps in and they quickly smoked without a speaker load. I replaced them with the square 100V caps and all is well. I don't plan on running it without a load but it has to survive at least for a little while if a speaker wire pulls out or isn't connected.