From: John Woodgate
Subject: Re: Cheap, and badly behaved, FET op-amp needed
Date: Thu, 10 Oct 2002 12:35:14 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 10 Oct 2002 14:06:24 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
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
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
PLEASE do NOT copy news posts to me by E-MAIL!