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Night telephone service light circuit (2)
Source: InternetPublisher:王达业 Keywords: Photoresistance Updated: 2020/12/03
How the circuit works: Switch SB is attached to the hook. When the phone rings at night,
the current passes through the optocoupler IC to C. Charging, while VT is turned on. Due to the large resistance of the photoresistor
RG, almost all of the VT collector current passes through the winding of the relay K, l(
pulls in, its normally open contact K-1 closes, and the bedside lamp H lights up.
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