Power-on pulse. Op-amp as comparator

118

01:26:30

Will it work?

published 9 years ago

hurz

9 years ago

More or less... problematic is while the switch is in open. Both comparator inputs do get 0V. But 0V is not exactly 0V. There is also added noise and the comparator must take a decision which input is higher than the other. This will cause a random output. But the moment you push the button, its fine and perfectly working. Make the voltage divider constantly working and the rest you will find out. Hope this helps.

ah2701

9 years ago

Thx!

abobaker

9 years ago

What if the comparator is powered from the same source that is to be connected ?!

ah2701

9 years ago

Thats my plan, but not sure if it will work... Will try it on a breadboard and find out. :)

abobaker

9 years ago

Ok I'll be thankful if you could report back your results here

ah2701

9 years ago

Tested and works like a charm! Everyting was powerd from the same 12V source, so there is no power on the comparator if switch is open. Used it to drive a smal relay.

abobaker

9 years ago

:D awesome thank you

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