Word: phototransistor
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Three weeks later Ledoux had found it. With parts picked up at a local Radio Shack store, the first-time inventor developed an infrared tester the size of a cigarette pack that could easily be held near the lights. And the price was right: just $8.70 to buy a phototransistor, light-emitting diode, switch, casing and nine-volt battery. Ledoux sent the plans to Army officials, who asked to sample the actual device. The gadget proved popular with other test crews, and the Army estimates that its use will save an average of $6.3 million a year. Ledoux stands...
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