This simple circuit published in the November 1962 Radio Electronics magazine beeps when the light on the sensor is cut off. Transistors are from the time, as is the phototransistor.
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- Written by: Newton C. Braga
This simple circuit published in the November 1962 Radio Electronics magazine beeps when the light on the sensor is cut off. Transistors are from the time, as is the phototransistor.
