Darkroom time exposure of the second circuit

  
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Darkroom time exposure of the second circuit It uses 555 IC A for the timing circuits. KA by the relay contacts to the control system of the exposure light source. Adjustment p
Darkroom time exposure of the second circuit - schematic

otentiometer RP, exposure time can be varied within the scope of 1-120s. For more long delay, may increase the capacity of the capacitor C4.




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