SV: Re: [sdiy] My PCB positives are see through!

[karl dalen]

There is a film called map/ carteographic plastic film
they are sold as regular transparensis but they are semi
milky wite, toner stick to it more evenly then on regular 
paper i have using it for the last 20 years, also the best 
lasers to print on these (or transparensis for that matter)
is older "laser based" print heads not led, the laser
ionises the toner partickles whit a higher energy then
led, so go to the scrap yard and fetch your self  
an old HP laserjet 4,5 or 6 model, or a nec660plus.

KD 

--- Tom Arnold <xyzzy at sysabend.org> skrev:

> On Tue, Dec 13, 2005 at 05:12:30PM -0500, Jeff Farr wrote:
> > I guess it's possible that this isn't a big deal, but I just got my
> > prints back on transparancies for etching a few boards and, despite
> > having them done at high quality, I can see right through the ground
> > plane when I hold it up to any light.
> 
> I do this all the time for making front panels and I've done a couple
> positive film boards ( I'm still making the transition to that ) without
> problem.
> 
> One thing to keep in mind when doing this, make sure you do the images
> backwards so you lay the toner side directly on the board or you'll get
> shadows.
> 
> If you are ultra paranoid like me, sacrifice a little scrap of pcboard,
> print out roughly  3  4  5  6  7  8  9  10 or some range of numbers
> bracketing the suggested time cover everything but the 10 with something
> opaque and start exposing, sliding down once a minute.  That way you can
> find the best time for your particular setup ( for me its 8-9minutes. ).
> 
> I print my films on a standard laser printer using 3M transparency sheets.
> 
> I used to print on paper then get a good printshop to do a photo transfer to
> film, but thats un-needed these days with a good laser printer.
> 
> -- 
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