Simple darkroom timer circuit
The darkroom timer is a simple timing device for photographic darkroom rinsing of film, printing or magnifying exposure. With the ordinary printer and magnifier, the printing and enlarging can be automatically exposed according to the preset time, and the signal can be sent according to the preset time when the film is washed. The device consists of a resistor and a capacitor to form a timing circuit, a high-power switch integrated circuit as a DC non-contact switch, and a two-way thyristor as an AC non-contact switch. The picture shows a simple darkroom switch timer circuit diagram.
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