Delay light circuit with digital circuit(3)

Published:2011/4/20 1:56:00 Author:Nicole | Keyword: delay light, digital circuit | From:SeekIC

The figure is as shown, it is a practical delay light circuit, it can be used in nightstand. The feature of it is to press the key SB, the light on; press it again, the light off; if it does not press SB after the light on, the light will delay few minutes, then the light off automatically; after the light off, if you press switch two times constantly, the light will on again. This delay light is convenient to work, and it can add spices. According to T=0.639R3C2, we can obtain the delay time, but the C2 has electricity leakage, so the delay time is increased to 30~50min.



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