Homebrew PCBs

i had no problems with the links try a different browser

On Sun, Nov 25, 2012 at 5:33 PM, Malcolm Parker-Lisberg <
mparkerlisberg@...> wrote:

> **
>
>
> Your links don't work as your site says don't hot link when you click on
> them!
>
> Malcolm
>
>
> I don't suffer from insanity I enjoy it!
> Mene, mene, tekel, upharsin
> The writing is on the wall.
>
> ________________________________
> From: DJ Delorie <dj@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Sunday, November 25, 2012 10:22 PM
> Subject: Re: [Homebrew_PCBs] Need comparing methods for smaller IC's
> (0.35mm pads and 0.15mm interpads area)
>
>
>
>
>
> I have no problem doing 0.5mm pitch ICs with UV films and an Epson R280
> (2880 dpi) inkjet printer, although I use the jetstar films and custom
> printing software for the densest artwork.
>
> 0.5mm is 20 mil (12px for 600 dpi), and the pads are 13mil with 7mil
> gap. You might be able to do get away with 8/4 pixels (8 pixel lines, 4
> pixel spaces) on a 600 dpi laser printer, if you've practiced enough :)
>
> The DPI of the laser printer isn't as important as how accurately it can
> place the toner without the toner being "fuzzy" around the edges. Most
> of the time, the copper edges aren't straight - they're "lumpy" as the
> toner is sort of "thrown" at the paper and doesn't always land exactly
> where you expect it. The "lumpyness" depends on your technique,
> printer, paper, etc.
>
> For reference, though, here's 6/6 done with toner:
> http://www.delorie.com/pcb/lab/66-0.jpg
> Compared to 6/6 done with UV film:
> http://www.delorie.com/pcb/lab/6mil-front.jpg
>
> Here's a sample 0.5mm pitch part done with UV films:
> http://www.delorie.com/pcb/lab/6mil-0.5mm.jpg
>
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>  
>



-- 
jeremy youngs


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