and can be used in variety of electronic applications where pause timing function is required. The push switch S1 triggers the timing cycle, the timing cycle can also be activated from negative output or a pulse from any other electronic application, for doing so just connect the output of your electronic application to the pin2 of the 555 timer IC. The timing cycle can be increase or decrease by changing values of the 220uF capacitor and 1M resistor. For example if you want to increase the timing cycle then you have to increase the values of 220uF capacitor and 1M resistor.

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This article explains a simple project of an auto pause timer during power outage or disconnection. The circuit will stay pause when the input power is disconnected and starts exactly from where it was paused when the input power come back or reconnected.
The circuit is very versatile
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Timer With Auto Pause Function During Power Outages