555 timer trigger circuit

Thread Starter

edneil_allaboutcircuits

Joined Oct 24, 2010
1
I configured my 555 timer to be used as a monostable multivibrator. Now the thing is, I don't know how to construct a trigger circuit that will input a 2V (with a 1us pulse width) signal to the trigger pin of my 555. Can somebody help me find a way out?
 

mbohuntr

Joined Apr 6, 2009
446
555's use a dropout pulse to trigger the output because the trigger pin uses a pullup resistor.(held high) See Bill Marsden's 555 section and circuits, they really helped me. Try a 2n2222 open collector on the trigger.
 
Top