Inexpensive infrared train detector circuit

[dadstruck]

Thanks everyone.

I reversed the wires on the emitter LED and the circuit is now working. I will play with the resistor to fine tune the sensitivity.

Thanks again 

Phil

[hon30critter]

Phil!

I am so glad to hear that you solved your problem!

Perhaps you could post the replacement parts numbers so people don't have to search them out themselves.

Thanks

Dave

[dadstruck]

Hi everyone

The part numbers that I was sent from Digi-Key were:

emitter was 754-1600-ND and the IC Phototrans IR was QSD123-ND. 

The problem was I used the computer created drawing from an earlier thread to wire up the circuit . The drawing is correct but note on the emitter about the positive being the long terminal is placed over the top of the emitter which is the negative side. Oops.  When I looked at the hand draw one at the start of this thread I could see my mistake.

Thanks again.

Phil

[hon30critter]

Thanks Phil!

Dave