Monday, 7 November 2016

pcb - Only charge capacitor when button pushed then turn on LED momentarily with capacitor when button released


I am trying to make circuit to turn on an LED momentarily. I would like to charge the capacitor when the button is pushed, then when released turn on the LED momentarily with the capacitor.



my circuit



Answer



If you only have a push-to-make switch:-


schematic


simulate this circuit – Schematic created using CircuitLab


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