Re: phase reversal: can an LM393 do this?


"Fred Bloggs"

Well- you're not all that clear, leaving the reader to guess at more
than few of the interconnections. And you can skip the ":-)" ploy used

If you are confused, then please ask for clarification.

by the NG hucksters, con artists, trolls, and posers. No one will be
asking you to give a presentation any time soon. The LM393 comparators

:-/ Hmmhp Giving your "bedside manner", I'm guessing that many don't
ask you for much of anything.

do not phase invert when a single input goes above the Vcc rail- even
as
high as 36V- as long as the other input remains within the CMR range,
which is -0.3V to Vcc-2V worst case. So you have something else going
on- probably noise and errant feedback issues. Lastly, there is no
need

Well one thing is for sure, clipping the output of the 741 solved the
problem. Perhaps, given that, you can further elaborate on what you
think the problem might really be.

for a 120ms one shot drive of the PIC input. All you need is maybe a
few
10's of microseconds and use the PIC to lock out responding for the
120ms. Your analog timing slew rates will then be 10,000x faster which

My slew rate is nowhere near as bad as you seem to think. It certainly
isn't significant in the grand scheme of things here. As a former boss
used to remind me; when it comes to the details of the code, it's my
pencil.

vastly simplifies the comparator monostable layout and design. And
there's no need for a 741 either, when at most a single 2N3904 CE is
all
that's required.

Speaking of leaving someone to guess at connections. And I can get a
voltage gain of 1000 this way?

.