555 photo amplifier sequence controller circuit

Published:2011/5/23 4:19:00 Author:TaoXi | Keyword: photo amplifier, sequence controller | From:SeekIC

This circuit has the functions of automatic timing exposure, automatic shifting filter and focus light automatical turn-on, and it can be used in the automatic operation of the black and white photograph amplifier. As the figure 17-3 shows, the automatic and manual timing circuit is composed of the IC2，IC2(F3140) and IC3(555), we can choose the automatic timing mode or the manual timing mode by K2. In automatic timing exposure process, K2 is in the position of 2 , we connnect the photocell (2CR41) probe to the IC1's input port, and adjust RP3 to make the IC2's pin-6 to output the level signal which is higher than 0V.



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