jremington:
Oh, so you are actually taking a circuit from a magazine and asking members of this forum about it.What does the article say about the circuit?
You suppose I take it from a magazine! is there a problem?!! I want to implement this circuit. I send about 15 email to article writer, but didn't get right answers!
schematic differ with PCB and have a lot of errors!!!
by the way, I'm making a ballistic chronograph with IR sender and receiver. My question is clear, a circuit with a photodiode, transimpedance amplifier and an op amp that when first op amp output voltage goes down the second op amp output voltage goes up.