[moved] lm311 comparator with feedback

[lukky61]

Is feedback necessary in Lm311, what are advantages with feedback of positive or negative.

 

[esp1]

hi,
I would always have some level of positive feedback when using the LM311 comparator.
This will prevent 'chatter' at the switching threshold. ie: rapid high/lows at the output at the threshold input switching level.

Never had an occasion to use negative feedback with a LM311.
E

 

[crutschow]

Comparators are not compensated for negative feedback so will likely oscillate if such feedback is attempted.

 

[Audioguru]

There is an extremely low frequency amplifier circuit that uses a comparator with negative feedback as an opamp and it has frequency compensation with a fairly high value capacitor on its output to ground.