There is no cap on the input side of the 7805, just on the output/ground
pins.  I'll try putting a 100n cap across the pins and let you know in a
second.

Thanks for your reply!

----- Original Message -----
<snip>

> You need to have a bypass capacitor (100n) between Vdd
> and Vcc at the PIC pins for a start. Do you also have a cap
> on the input side of the 7805?
> David...
>
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