Hi, I'm planning to build a shutterspeed tester to test some of my older cameras. But to save me the trip to the electronic parts store I thought I could salvage some photodiods or phototransistors. Anybody know any electronic stuff that contain hi-quality photodiods? I read about cordless computer mice, but that those weren't so good. Anybody got more suggestions? ANy household appliances? I've got a full container full of electronic junk (computers, household stuff, some tools) in my apartment complex so I think there could very well be some lying around there.