How do I set up a monostable 555?

Ya, i've been searching around and what I don't understand is how to make the pulse for the trigger.  Its has to be less than 1/3 the supply voltage right?  But how do I achieve this?  THANKS  

sort by: active | newest | oldest
Well, where's the trigger cominfg FROM ?

A simple resistive divider will make it happen, but you need to know what the peak of the trigger voltage is going to be.
junits15 (author)  steveastrouk6 years ago
the trigger is supposed to be a transistor that will be triggered by sound from a microphone. However for testing I'm using a pushbutton switch, what do you mean by the peak of the trigger voltage? Also Im beginning to think I may have burned my chip out because one time it became extremely hot, but I'm not going to rule out the fact I probably built the circuit wrong
Sounds like it might be damaged, though 555s are pretty robust beasties.

Steve
junits15 (author)  steveastrouk6 years ago
I'm thinking the same because I've tried tons of different circuits and none of them worked, it doesnt seem to be doing anything, do you know how I could test to see if its working still?
I think, for the price, I'd just swap it out for a new one.
junits15 (author)  steveastrouk6 years ago
Ok thanks!