Quote Originally Posted by paul_c5x4 View Post
The SFH300 phototransistor will work just fine - I used one for a shutter tester wired up to a parallel port without any problems.

Excellent news, thank-you. I just bought one.

But I wired up the circuit and can't get anything out of it. Don't know how to debug it but I'll try again later. At least i know all the parts are now correct.

The original suggested using a laser pen to shine through the lens. I'm using a Bowens flood light. Will it still work?