-=> Mike Ross said to Greg Mayman
 -=> about "BAG OF CHIPS" on 02-13-04  09:45.....

 MR> {at}PID: BWMAX2 3.20 [Reg]
 MR> {at}MSGID: 1:167/133.0 402cff38
 MR> "Greg Mayman" bravely wrote to "Mike Ross" (11
Feb 04  08:54:00)
 MR> --- on the heady topic of "BAG OF CHIPS"
 
 GM> 1. Comparators don't normally have any internal feedback. If they
 GM> had some positive feedback, the positive and negative trigger
 GM> levels would be different and they would be called Schmitt
 GM> Trigger Buffers.

 MR> The LM311 seems to have a signal path between the output pre-driver
 MR> and the "Balance/Strobe" input terminal pin but it seems to be a

I can't see what you're refering to. My NS book shows the
"balance/strobe" terminal (pin 6) connecting to the emitters of
two transistors near the input.

 MR> current source so perhaps it has no effect. Couldn't adding a little
 MR> regeneration simply increase the overall gain without affecting the
 MR> trigger levels?

Nope. Positive DC feedback in any degree will cause a separation
between the positive-going and negative-going trigger levels.

OTOH capacitively coupled positive feedback has a different
effect, and usually causes oscillation. One common form of
oscillator uses positive AC and negative DC feedback.

   ,-./\
  /     \ From Greg Mayman, in beautiful Adelaide, South Australia
  \_,-*_/    "Queen City of The South"    34:55 S  138:36 E
       v

... If we are what we eat, then I'm easy, fast, and *cheap*!
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