This is a multi-part message in MIME format.

------=_NextPart_000_007E_01CAC297.D2577E40
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit


> anybody have a favorite, simple solution for something like this?

Any oscillator can generate a -ve voltage. I use the attached for
just what you're wanting, -5V for op-amps in a PIC/analogue
circuit. In my case the PIC outputs a 'tone' (temporarily if desired)
to make Vee then takes an analogue reading from the opamp. Vee
is very close to negative Vcc

wbr, Joe
------=_NextPart_000_007E_01CAC297.D2577E40
Content-Type: image/gif;
	name="PIC_Vee.gif"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
	filename="PIC_Vee.gif"
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------=_NextPart_000_007E_01CAC297.D2577E40
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist

------=_NextPart_000_007E_01CAC297.D2577E40--