I'm using a 555 timer to turn off an LED with delay. Here is the circuit. All I want to implement is, to get the input voltage changes in output with a constant delay.
When I close the switch, the capacitor in RC network being charged and the OUTPUT will be LOW after n fraction of time. But, after opening the switch, it takes time for capacitor to being fully discharged.
A. Is there a way to discharge it quickly? B. And is there a more simple implementation without using 555 timer? C. How can you revert the output from LOW to HIGH instead of HIGH to LOW?