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Lights with digital delay circuit

the circuit components are used: CCD4069 9013 MMAC94A4
Figure is a practical light delay circuit is very suitable for use on the bedside table. It is characterized by: Click the button SB, lights; click, lights out; If lights do not follow after the SB, the circuit delay time, the light will go out automatically; if the lights go out after the double switch, light will light up again. With this lamp lights can be easily deferred live cattle, adding to taste. The circuit delay time calculated by the formula T=0.639R3C2, but there is leakage factor C2, will increase the delay time ranging from 30 ~ 50min.

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Lights with digital delay circuit