/challenges-projects/project14/backtoanalog/b/blog/posts/hiraga-preamp-build-5---software-for-a-tube-ampWell, life is still not on a good keel. I picked up at Fry's a proto shield, and some optocouplers. So the world keeps spinning and I am using a software-controlled power-supply I don't have a formal sketch but this is what it will do: Cod...en-USTelligent Community 12