Darkroom timed exposure circuit 2
Source: InternetPublisher:明天见 Keywords: Optoelectronics timing circuits Updated: 2020/08/24
Darkroom timed exposure circuit 2
It uses 555 time base integrated circuit A as the timing circuit . The exposure lamp power is controlled by the relay KA contact
. Adjust the potentiometer RP to change the exposure time within the range of 1-120s. If longer delay is required,
the capacity of capacitor C4 can be increased.
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