While there are lots of quality kits for preamplifiers, I have never really found a decent way of adding more inputs to a preamp. The existing ones are either of dubious quality, spec'ed like a spaceship, or both.
So I decided to make my own input selector. With relays. And an ESP-32 module! A year,...
Several people have been in touch lately with questions on how to modify the PCB into something it isn't right now. Popular requests are balanced inputs and/or balanced outputs, and DC servo on the outputs.
It's become evident that I need a better solution for photographing my projects. So I went out and bought some surprisingly cheap LED panels:
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