Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Dean Thompson" 
> for quite some time, and just yesterday made my first PCB using the 
TT
> method. It worked out really well! I used an ordinary clothes iron 
to
> transfer the image to the PCB. I tried to use a laminator but it 
wouldn't
> work, the toner wouldn't stick at all. My laminator has an 
adjustable
> thermostat (max 140 deg C), is this hot enough? Anyway, the iron 
worked
> great, very consistent. I was surprised because the board was 
fairly large
> (270mm x 150mm).

I believe that should have been plenty hot enough.  You should see 
the toner begin to "tack" by the 4-5 pass on a board that size.  Was 
it 2oz clad?  I remember that I did have to run them through the 
laminator a few more times than normal when I ran a boards that 
size.  I had 1oz 6"x9" dual sided approx 18 times --lost count.  When 
I have a lot of copper or running 2oz I preheat the board with a 
paint stripper heat gun to "get the ball rolling"(it also helps dry 
out the board from my when I wash off the copper oxide/protective 
coating just prior).  I don't know if that really helps, but thats 
the way I've been doing it and it seems to work.  Anyway, your 
results did turn out to be pretty darn good with the iron.  I wished 
my firsts were that nice!
 
> Also, thanks to Dal Wheeler for the great guide he has on his web 
page! It
> helped me out.

I'm glad it helped! I'll have to mention puting on a silk layer in 
the write up.  I'm impatient so I don't normally do it, but looking 
at your pictures makes me think that I should be.  

BTW, what are you doing with that many relays?