Peter, LM324 is the last operational amplifier I'll use for this purpose,
because the operationals are catching one each other and the input
performances are poor. There are some beautifull and exorbitant expensive
BURR-BROWN instrumentation amplifiers.
I like ( and use intensively till now ) LM308/LM301 or TL081/TL084
best regards, Vasile

On Sun, 10 Feb 2002, Peter L. Peres wrote:

> The LM324 requires a coulpe of tricks to make it work well. One of them
> requires that you ensure that none of the inputs ever go over 3.5V or so
> because the output will become +Voutmax immediately. If it is used with a
> circuit that allows any of the inputs to become more positive than this
> Voutmax then this can cause it to latch up.
>
> There are a number of fixes that remove this problem but you need to work
> them out yourself for your circuit.
>
> hope this helps,
>
> Peter
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics