Afroman takes a cadmium sulphide photoresistor and uses it to build a laser tripwire circuit that can trigger pretty much anything. Don't forget to vote 5 and watch Afroman's Transistor tutorial if you need more info on how to switch different gadgets on and off.
Keywords: laser, trip, wire, tripwire, beam, electronics, circuit, photocell, photoresistor, light, dependent, resistor, LDR, lazer, alarm
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