The amplifier timed exposer circuit

Published:2011/8/15 21:57:00 Author: | Keyword: amplifier, timed exposer | From:SeekIC

The amplifier timed exposer can turn on the amplifier light, and the time is ranged from 1s to 20s, and it can also set the LED which flashes once per second, which is convenient for the dark room. The circuit consists of the comparator, timer and pulse timer. The comparator is used to estimate the exposing time. By adjusting VR1, the light volume on PCC1 can be tested. The timer is added on the non-inverting phase input terminal of IC1B by the VR3 adjusting Vref. When C2 is discharging, IC1B is outputting a high LEV, TR2 is conducting, the relay is working and the amplifying light is put through.



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