555 simple printing & amplification timer circuit

Published:2011/5/21 6:43:00 Author:TaoXi | Keyword: simple, printing, amplification, timer circuit | From:SeekIC

As the figure 17-12 shows, the timer is composed of the step-down rectifier circuit and the monostable circuit. The monostable timing circuit is composed of the 555 and the C2, the photoresistor RG, when using, you need to press AN, the 555 sets, J1-1 connects, the white light turns on. The light shine on the RG through the film, according to the film's transmittance, RG presents the different resistances, so the monostable delays are different too. The delay time td=1.1RGC2. When the temporary stability time is up, J releases, the white light turns off, the red light turns on, so the automatic exposure is finished.



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