Semiconductors are sensitive in non-linear manner to both temperature and light. I was experimenting with latter, it was large germanium(!) transistor w/o cap a

Semiconductors are sensitive in non-linear manner to both temperature and light. I was experimenting with latter, it was large germanium(!) transistor w/o cap and joystick port for analog input. What I really learned from that was sound card input is very easy to fry.