Homebrew PCBs

sailingto wrote:
> OK, now I see - I was able to do some editing, create a new page - I did
> not save anything - didn't wish to mess anything up. I think I understand
> it now.

I think I'm going to create a "Sandbox" page so people can edit pages, 
practice with Wiki markup and so on. Though I suspect the "Preview" feature 
serves most of that need...

> I think a good idea would be to have on the home page just the very brief
> explanation of eacg Transfer method, with the title of each a link to a new
> page with MUCH more detailed info.

That's what I was planning to do -- I've done a little bit of stuff on the 
"exposure evaluation" page (relating to the use of a step tablet to measure UV 
exposure) but I'd appreciate it if someone could have a read through, sanity 
check it, and possibly complete the "How-to" section.

> Good idea - and if we all work on this, we can make it grow.  Then someone
> new to PCB etching could go to this website and get all the info needed
> from one spot to start making PCB.

I have to admit that I'd rather like to see some stuff on UV etching -- 
especially relating to setting exposure levels. I'm not bothering with 
laminating at the moment (though Mega have some UV-exposed solder mask that 
looks like it might be fun to play with) but have got a few of the pre-coated 
Eurocard-sized 1.6mm Microtrak boards (from Farnell, but made by Mega) and 
some of the 0.8mm pre-coated CIF boards as well (again, from Farnell, but more 
expensive than the Microtrak boards).

The step guides are sitting on my desk, I'm just trying to figure out how to 
use them with positive-acting (where exposed areas wash away in the developer, 
i.e. tracks are black on the artwork) photoresist!

-- 
Phil.
ygroups@...
http://www.philpem.me.uk/