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Optical control bolton flash safety light circuit

2017-02-03 05:20  
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Optical control bolton flash safety light circuit
This circuit is suitable for construction site safety light. In construction site, A, B terminals are connected to power network, 220V mains supply is reduced by transformer B, it is rectified by Dw and filtered by C1, it provides photoelectric switch with 9V DC power. Dw takes the action of rectification and voltage regulation. Under bright light during the day, photoelectric switch cuts off, SCR1 has no trigger current and it is in off state, the red singal indicator light ZD does not turn on. When night comes, photoelectric switch turns on, the oscillation circuit which is composed of IC starts to work, IC's ③ constantly outputs ultra-low frequency rectangular pulse, SCR2 is conduction under this pulse's high level, and it is closed under the low level, so we can see the singal light winking.