Re: Opamp problem


John Popelish a écrit :

lerameur wrote:
I took a snap shot of my circuit and also posted on
http://www3.sympatico.ca/lerameur/
I used the LM324 becasue I had it, and using the LM393 or LM339 did not
work using simple testing . From what I read these chips should be
doing the same work. Any chips you recommend ??
The main differences between the LM324 and 339 are that one is an
opamp (bidirectional output stage and slow response) while the other
is a comparator (fast response, pull down, only, output).

If you want to alter the circuit to take advantage of the speed of the
comparator, you have to add some pull up mechanism to each of the
outputs. I cannot recommend something specific, without understanding
better what the circuit is supposed to do.

I just want to understand how they work for now. My knowledge was to
put energize the chip (V++, V--) then by putting a voltage at the non
inverting input, gounding the inverting input, I should be getting V++
at the output right ? with any chip above, but i am not getting this
except with the LM 324.
The follwing step (or problem) involves the circuit explained
originally (logic probe), if I try to use two OP amp (in one chip ) the
output go to high when theoretically they should be low.. just like I
show in my schematic.

ken

.

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