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Assembled Transistor Photogate Trigger with Breadboard (TPG-BB)

This photogate trigger uses a transistor which switches on when the infrared beam from the emitter is blocked from reaching the detector.  The circuit has a rapid response. Sensitivity is adjusted with a 100-kW variable resistor. The two transparent components near the back of the breadboard are the emitter and detector.  These can be mounted wherever needed and connected to the breadboard with the included 3-conductor cable.

 

Substitutions may be made for some of the parts shown above due to changes in the availability of parts from our suppliers.

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