see
http://techref.massmind.org/power
http://techref.massmind.org/power/isolation

---
James Newton mailto:jamesnewton@geocities.com 1-619-652-0593
http://techref.massmind.org NEW! FINALLY A REAL NAME!
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tobie Horswill
Sent: Friday, March 31, 2000 05:20
To: PICLIST@MITVMA.MIT.EDU
Subject: [OT] Dual supply for mixed PIC/ANALOG project.


Hi,

    I've just started working on an audio project involving an 16F877 and an
Analog Devices SSM2160 (requiring a  -6V,+6V supply). Any hints on how the
two supply voltages should be generated and routed on the PCB in order to
minimise digital leakage in the audio ? I know this isn't a great idea but
if possible I would be using using a small +5V, +12V laptop computer style
switching supply. How can I best isolate the circuit from the switching
noise ? I'm a programmer kind of guy, not an power-supply engineer so please
forgive my electronics shortcomings... _-.\

Tobie