Simple Precise Timer Circuit Diagram

Published:2011/8/9 17:59:00 Author:Vicky | Keyword: Precise Timer | From:SeekIC

The circuit is a pluggable timer for delaying the time of conducting power supply, R1 and C1 constitutes filter to reduce the peak of the noise, and R2 and C2 work to further promote the performance of the filter. There is a shunt regulator within the integrated circuit to reduce the noise of power grid. It can reduce the noise to 15000 times less. There is a RC timing component which is connected with the periphery of 2N1034 to work with the precise oscillator to drive a 12-grade binary counter, so that it comes to the proportion of 4069:1. When the state of the trigger end or the voltage of power supply is changed, then the state of output is changed only after 4095 cycles of oscillating. As for timing components of 3MΩ and 10μF, it means it takes them 24 hours of waiting time. Certainly, the required precise delay time can be acquired by adjusting the timing resistance.



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