model train detector using photocell

  
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 - schematic

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



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