model train detector using photocell

Posted on Jan 10, 2013

This photocell is best mounted at tie level between the rails. The variable resistor adjusts the sensitivity of the circuit. This circuit can be powered by either 6 or 12 volts - BE SURE to use the proper relay;

model train detector using photocell
Click here to download the full size of the above Circuit.

note that some relays are rated for 5 volts, these should be okay with 6 volts.

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