Homebrew PCBs

I haven't started to document the process yet because I'm still 
experimenting. I got my initial ideas and encouragement watching some 
youtube videos bye by a guy with a channel named "pathetic-computing." You 
can find out about conductive ink at http://jordanbunker.com/archives/41

Because the holes are drilled and plated before etching, and I use negative 
dry film photoresist, the masks are clear where the pads will be, so you can 
see the holes to align the mask on either side. Before applying the film I 
fill the holes with a mixture of drywall plaster and sugar, let it dry, and 
sand the board lightly to remove any plaster from the surface. This provides 
a flat surface for the resist film, and is easy to remove with water and a 
water-pik (dental cleaner) after etching. The sugar resists the etchant in 
case any does come into contact, which otherwise would solidify the plaster 
making it difficult to remove.
--
Phil M.

----- Original Message ----- 
From: "Mitch Davis" <mjd@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, May 21, 2013 6:52 PM
Subject: Re: [Homebrew_PCBs] Re: printer


> On Wed, May 22, 2013 at 3:30 AM, Phil@Yahoo <yahoo@...> 
> wrote:
>>
>> do more than six feet. Now that I'm almost 60 (yikes!) well, you don't 
>> want to know.
>
> Switch to metric.  You can stand a lot closer, your feet stay drier,
> and you can keep your vanity "score" the same :-)
>
>> I make double sided PCBs with plated-thru holes
>
> I'd be very interested to read more about that, do you have a blog
> page or web page showing what you do?  I'm especially interested in
> how you get registration between the two sides right.
>
>> a side because of the distortion caused by printing laser transparencies.
>
> Have you tried printing on drafting paper?  Drafting paper is
> transparent to UV, and I've had good success with it.  I just bought a
> pad at the stationery shop.  And just as for transparency, the
> printing should go against the board.
>
> You can read about my method with drafting paper here:
>
>  http://capnstech.blogspot.com/2011/05/playpause-making-pcbs-at-home.html
>
> All the best!
>
> Mitch.
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and 
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>