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From: "Frank Bemelman"
Subject: Re: Cheap, and badly behaved, FET op-amp needed
Date: Thu, 10 Oct 2002 17:58:36 +0200
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Organization: EuroNet Internet
NNTP-Posting-Date: 10 Oct 2002 15:59:12 GMT
"john jardine" schreef in bericht
> C.D.H.Williams@exeter.ac.uk (Charles DH Williams) wrote in message
> > For years I've used LF 411 (fet input op amps) in some electronics
> > practicals for students. I liked them because they were cheap, easily
> > destroyed by wrong connections, and would oscillate when used in
> > breadboards [*] with poorly decoupled power supplies or if the students
> > didn't bother using scope probes. These features mean that the students
> > are guaranteed to encounter lots problems that they have to deal with.
> > 411's seem to have become very expensive recently.
> > Any ideas for a cheap replacement op-amp with similarly "educational"
> > Thanks.
> > Charles
> > [* so there are always several bad connections to track down, even when
> > there are only 6 components in the circuit.]
> Although not cheap-cheap, Nationals CMOS rail-rail 'LM660' may fit
> your bill. Possibly one of the naffest op-amps of recent times.
> Guaranteed to oscillate with >30pF of load capacitance and only
> conditionally stable upto that point.
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