This was not said by Rich.  I sometimes also get confused by replies to a
posted message.  Rich suggested an op amp similar to the LM324 which is nice
because it has PNP input transistors, which, therefore, can be ground
referenced.  A couple of zeners (with low ESR capacitors) can split a single
ended supply because they do have a low impedance.  But there is a great
variety of solutions to that problem.


----- Original Message -----
From: <EBoggs@AOL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 23, 2004 7:44 PM
Subject: Re: [EE:] General Opamp questions


> In a message dated 8/10/2004 10:03:54 PM Eastern Daylight Time,
> rgrazia1@ROCHESTER.RR.COM writes:
> > Hi all. Few questions about opamps. If I see a circuit running off a
> > split power supply, but the negative voltage is only used for the
> > opamps, can I redesign it using single power supply opamps such as the
> > TLC272? If I must use a split power supply, would something like the
> > http://focus.ti.com/docs/prod/folders/print/pt5062.html from TI
> > (+5Vin, -15+15Vout) be a bad idea due to switching noise? This is for
> > audio purposes.
> Can you use the +/- 12vdc from a max232 chip. I was going to try it
myself.
> Not much
> drive current.
>
>
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