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Fork sensor

Fork photocell 10-30V both standards NPN & PNP Bottom side PCB Face side - Thermotransfer Four photocells was made Soldered
Very simple: 8V stabilizer, comparator, LEDs, output transistor Fork photocoupler - IR emitter + IR phototransistor Power & Output connector: N -> NPN, P -> PNP Assembled...
...by hot-glue-melt... ...and two pieces of plexiglas