optically controlled timing street light circuit

Published:2011/6/22 9:44:00 Author:Nancy | Keyword: optically controlled, timing street light | From:SeekIC

The circuit shown is a optically controlled timing street light circuit which indicates that the illuminating lamp can work automatically several hours at dusk and then automatically extinguish. After dark, the BG4 conducts under the optoelectronic switch, the oscillator circuit formed by IC turns on, the ③ of IC1 outputs pulse continuously. For the charging time constant is large with the oscillating period of the oscillator circuit T ≤R7C3, the voltage of C3 is 1/3VCC at the beginning of operation, the ③ output of IC2 is high level, triggering SCR to conduct, both ends of lamp ZD energize and glow.



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