Night target display circuit diagram
Source: InternetPublisher:spectrum Keywords: Circuit diagram display circuit SCR Updated: 2021/12/13
As shown in the figure, this circuit is suitable for shooting at night and turning on the street lights on the corridor.
During the day, due to sufficient light, BG3 is turned on and SCR is blocked. The oscillation circuit composed of IC , etc. has no voltage and cannot work, so the indicator light does not light up. At night, because BG3 is turned off, SCR is triggered and turned on, so the oscillation circuit composed of IC etc. starts to oscillate. IC 3 continuously outputs an ultra-low frequency square wave with a frequency of f=1/T=1.44/(W+Ra+2Rb )·C, you can see that the indicator light connected between IC 3 and ground is flashing, which is very eye-catching. Adjusting Ra·Rb to the size of C1 can change the frequency of flash.
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