Reply-To: "fred bartoli"
From: "fred bartoli"
Subject: Re: Cheap, and badly behaved, FET op-amp needed
Date: Thu, 10 Oct 2002 16:17:32 +0200
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 10 Oct 2002 16:16:20 MEST
John Woodgate a écrit dans le message :
> I read in sci.electronics.design that Tony Williams
> wrote (in <firstname.lastname@example.org.
> uk>) about 'Cheap, and badly behaved, FET op-amp needed', on Thu, 10 Oct
> >In article ,
> > Charles DH Williams wrote:
> >> 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.
> > TL071/081 would be my choice.
> I find them very well-behaved. DYMV?
> A device that isn't unity-gain stable would be instructive! Preferably
> not stable below a gain of 10.
> > Plus a supply of 741s to plug in instead, in
> > order to demonstrate the effects of an opamp
> > with more deficiencies.
> And also, I hope, to show what a 741 can do well, when **used
For professional audio line outputs ?-)
> Regards, John Woodgate, OOO - Own Opinions Only.
> Interested in professional sound reinforcement and distribution? Then go
> PLEASE do NOT copy news posts to me by E-MAIL!