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How do I set up a monostable 555? Answered

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  

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steveastrouk

Best Answer 7 years ago

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.

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junits15steveastrouk

Answer 7 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

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steveastroukjunits15

Answer 7 years ago

Sounds like it might be damaged, though 555s are pretty robust beasties.

Steve

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junits15steveastrouk

Answer 7 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?

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steveastroukjunits15

Answer 7 years ago

I think, for the price, I'd just swap it out for a new one.