Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Leon Heller" <leon_heller@h...>
wrote:
> 
> ----- Original Message ----- 
> From: "Steve" <alienrelics@y...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Monday, December 01, 2003 6:28 PM
> Subject: [Homebrew_PCBs] Low leakage coatings? Re: how can i prevent
> corosion?
> 
> 
> > Does anyone here have experience and suggestions for low-leakage
> > coatings? I've got some circuits in mind that in the past I've done
> > dead-bug style to avoid surface leakage on a PCB. Is there a good not
> > to expensive low leakage coating?
> >
> > I'm thinking of an input with an impedance in the rage of 100M to 10G.

> 
> Have you used 'guard ring' techniques and Teflon standoffs?
> 

That blocks interference but it can actually make leakage worse as the
path to ground is shorter.

No, haven't tried Teflon. Is it that good an insulator? What am I
using the stand-offs for? If you mean the supports for the PCB, that
still leaves me with surface leakage across the PCB.

Steve