Exposure timer circuit D flip-flops

  
Exposure timer circuit is shown in Figure D flip-flops, timing can be arbitrarily selected within the 1 ~ 30s. Figure D flip-flop circuit connected to a one-shot, when you need
Exposure timer circuit D flip-flops - schematic

the exposure, press the button AN, that is a pulse applied to CP D flip-flop, the circuit into the temporary steady state.




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