Dark room exposure timing light circuit(1)

Published:2011/4/25 0:58:00 Author:Nicole | Keyword: Dark room, timing light | From:SeekIC

The figure is as shown, it is a dark room exposure timing light circuit which is suitable for black-and-white photographyblowing down Photos, the monostable trigger is composed of NE555 time base circuit and potentiometer RP, capacitance C. In normal times, the circuit is in resetting state, NE555's ③ foot output is low level, relay K is no action, exposing lamp E is off. LED2 is work indicating light, it can light up the calibrated disc of potentiometer RP. At this time, NE555 internal discharge tube turns on, capacitance C1 is short-circuited, it can not charge. K can adopt JZC-22F、DC12V small middle power electromagnetic relay.



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