> -----Original Message-----
> From: Josh Koffman [SMTP:listsjosh@3MTMP.COM]
> Sent: Wednesday, July 23, 2003 5:17 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [EE]: PIC ADC OpAmp circuit
>
> Ok, I've been reading my Art of Electronics book, trying to figure out
> how to design an input circuit that will adapt the 50K resistance I am
> trying to read down to the 20K input impeadance of the PIC.
>
Which PIC are you using? I didn't know any PIC's had a recommended source
impedance above 10k, and the 18F series have this reduced to 2.5k.

Mike



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