555 darkroom timer circuit (2)

Published:2011/5/24 2:50:00 Author:TaoXi | Keyword: darkroom, timer | From:SeekIC

Related components PDF download: NE5553DG12 As the figure 17-15 shows, as the figure 17-15 shows, the monostable delay circuit is composed of the IC(555) and R2, RP1, C3.etc, when you press AN, 555 sets, VT1 conductd, the SRC trigger the conduction, and the lamp bulb gets the power. The timing time td=1.1RP1C3. When the time is up, 555 resets, VT1 cuts off, the light turns off. If we changes the RP1 into the select switch with timing resistance, we can get the accurate timing.



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