Variable Delayed Astable 555 timer output

Thread Starter


Joined Jun 11, 2008
instead of having a Astable output once i power up..

is there anyway whereby i can make a delay before a Astable 555 timer output square wave is generated?


Joined Mar 24, 2008
Yes, use another 555 to control your astable 555 oscillators pin 4.

Conversly, you could use a resistor and a capacitor on pin 4, the resistor to Vcc, the cap to ground. The trade off is the cap has to be a large value, and the resistor a fairly small one. What kind of delay are you looking for?