The unit is connected to a 220V AC outlet, transformed to 15V DC and to =
5V DC with 7805.  Transformer is on board #1, 7805 and the complete =
circuit is on board #2 and there is about 15cm of space between the =
transformer and the 7805 (I don't know if it is significant to note).

-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Olin Lathrop
Sent: Monday, July 14, 2003 3:51 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: WDT was C compiler choice ?


> So, I guess the only meaningful choice left is to shield the =
electronics
> somehow to protect it from EMC.  Would reynolds wrap do?  As I am a
> programmer, and not a electrician/electronician (if there is such a
> word).

I don't think it's as much an issue of shielding as good power supply
design and ESD protection, although shielding can help if the frequecies
are high.  Where is the power for the PIC coming from?


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