While waiting for some parts, I put together a PC Board to drive the dual 807 amp. The circuit may look familiar as I lifted most of it from the Retro 75 transmitter.
I needed a way to vary the output so I added a LM317 variable voltage regulator to the FET output device and it works great. I can vary the output from about 1/4 watt to 2.4 watts with 13.8 volts supplied to the board. I also changed the output filter a little. The board puts out a nice clean sine wave. The scope shows the output at 1 watt into a precision dummy load (couple of 2 watt 100 ohm resistors in parallel)
I have run it at 1 watt for several hours with no problem. At 2.5 watts out, the heat sinks warm up pretty quickly, but I don't expect to need much more than 1 watt to drive the two 807s.
Pat
N4LTA
