There is an implied minimum operating voltage based on other specs like
common mode range and output swing.

If , as a recent post in this thread says:

Output voltage swing depends on load but can be 3 to 5 volts less than
supply in either direction worst case and 1 to 2 volts typical. Sounds like
you were lucky :-)

Then it is obvious that you will need significant supply voltage ( >10V!!)
to get _any_ output swing in the worst case.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Jinx" <joecolquitt@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, October 22, 2003 8:47 AM
Subject: Re: [EE:] How much headroom in an LM741?


> > > I believe Vcc should be at least 6V for a 741. If that's the
> > > case you'll be lucky to get it to behave properly at 5V
> >
> > That's what others are saying, but I can't seem to find a minimum
> > supply voltage spec in either the national or fairchild datasheets.
> > hmm....
>
> hmm indeed. You're right. It's not in the NS pdf or in the Linear
> Databook (my hard copy is ancient but I find it's exactly the same
> as the pdf)
>
> But every op-amp comparison chart I've seen says that the 741
> is specced for +/-3 to +/- 18 (or sometimes +/- 22)
>
> This pdf (also NS but though the same as Russell or I have seen)
> has a graph at the bottom showing Vcc +/- 2 V
>
>
http://www.physics.wisc.edu/graduates/courses/623-f03/ds/LM741-opamp-new.pdf
>
> I still wouldn't use it at less than +/- 3. Plenty of modern 5V amps
> around
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body