Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: [Homebrew_PCBs] spray Etching of TT

From: Stefan Trethan <stefan_trethan@...>
Date: 2003-12-01

> Questions:
> 1. Should the whole board come out with really god adhesion?

yes. only sometimes on the edges i had a bad spot (i have a board outline
trace most time which likes to get off where i start peeling the paper)

> 2. Any ideas? Is this a pressure issue (I left the iron and steel plate
> with
> no pressure)?

I apply pressure, no idea, maybe 30N or so.. no more than 60N.

> Temp issue (the paper turned brown after being under the iron
> for a short time, the copper oxidized where it was not under the paper)?

My paper gets slightly brown (more yellow) after the whole run. the copper
discolors very slightly too.


> Time (8 min)?
>

30 second to 1 minute.
may be too long your 8 minutes.
you can cut down time if you preheat the board but i don't really see a
reason.

> Thanks for the help I am definitely farther than I have ever been.
> John
>

not sure if you steel plate is perfect, i don't really get the picture, do
you attach the steel plate to the iron and press with it or what?


st