IR Photo Interrupter – Optical On/Off Switch Sensor – JAYCAR

You need a circuit to switch on and off without any physical contact, and the relay setup is a headache. This photo interrupter does it optically. An IR LED shines across a gap at a phototransistor. Something crosses the beam, the transistor flips. That's it. Fast enough for counting, timing, or sensing. One-piece moulded housing, mounts to PCB or chassis. No fiddly alignment beyond basic positioning

• Optical switching: IR LED and phototransistor across a gap
• Very fast response – suits counting, timing, and sensing
• Rugged one-piece moulded plastic construction
• PCB or chassis mounting options
• Applications include tachometer, edge sensor, tape-end detection, and opto ignition