Four hours order timer circuit

Published:2011/6/20 3:39:00 Author:TaoXi | Keyword: Four hours, order timer | From:SeekIC

The four hours order timer circuit uses the N8281 distributor network between the two timers of the double timer 556, it does not use the big volume low leakage current capacitor, so it has the long delay time. The first timer forms the oscillator, the output adds to the output which is produced by the N frequency division network with the N/f cycle, it triggers the monostable circuit which is composed of the second timer. The delay time depends on the delay output time of the distributor. You can cascade some distributors to make the delay time to a few days or weeks.



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