Homebrew PCBs

----- Original Message ----- 
From: "Philip Pemberton" <philpem@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, June 03, 2005 3:12 PM
Subject: [Homebrew_PCBs] Minimum track widths


> Hi folks,
>  Has anyone done any testing to see if it's possible to go down to 12/12
> track width/spacing with the Staples photo paper (or PnP Blue)?
>
>  I've got a double-sided PCB here that won't route (without a stupid 
> number
> of vias) in anything above 12mils. If it's not possible to go down that 
> far
> with the Staples paper and a 600dpi laser, I'll send the boardfiles off to
> Olimex. Otherwise, I'll try and make the board myself :)
>
>  While I'm at it.. has anyone got any tips for aligning the two transfers
> for top copper and bottom copper?
>  Also, does anyone know if toner is conductive - I was planning to put a
> placement guide on the top layer, but not if it'll end up shorting 
> everything
> out.

I can do 12/12 without problems using the standard UV exposure processs.

Toner contains carbon black, so it might be slightly conductive. The 
resistance will probably be too high to cause problems, though.

Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller