Homebrew PCBs

In article <009901c3a563$98f0f760$0c00a8c0@house>,
   Les Newell <lesnewell@...> wrote:
> Hi Stuart, I am taking my recipe from here:
> http://www.pacificsun.ca/~robert/pcb/cucl.htm

Couldn't get anywhere with that link I'm afraid. My browser tried and
after a long time gave up. I'll try again another time - the site may be
temporarily down.

> The only difference is that I am using methylene orange rather than
> bromophenol blue because it is cheaper and I can get it. The PH ranges
> for the two indicators seem to be virtually identical so methylene
> orange should be a good substitute.

It's two long now for me to remember the different charachtaristics of
indicators and my books are all in the loft.

> You don't have to use copper oxide. You can add scrap copper to the acid
> and leave it in a bubble tank for a couple of weeks. I have heard that a
> table spoon of used ferric chloride speeds things up.

> In the end I ordered from www.labpakchemicals.co.uk as they could supply
> everything I wanted at a reasonable price. 

Looks interesting

> I tried phoning a local
> chemical supplier and their prices were about the same but they had a 2
> week lead time. The only disadvantage with labpak is that they have a 50
> pound minimum order

I'd have to think hard about how to make that value up I think.

> but I made that up with sulphuric acid for anodizing

I remember seing a "how to do it" article in Elektor some years ago - I've
still got it somewhere - looked interesting but obtaining chemicals seemed
to be a problem

> and some flourescein for a friend to trace a drain with. Flourescein is
> pretty harmless but even the slightest trace in water shows up bright
> green. As a kid I added some to a swimming pool once. The whole pool
> ended up flourescent green :-)

Ahh yes, tell me about it :-)

> Oh, by the way I have found a great way of removing ferric chloride
> deposits. I was given a tank that was in a terrible state but a few
> hours soaking in concrete cleaner brought it up like new.

Thanks for the tip.

> I know about Farnell. I have an account with RS components and they sell
> quite a bit of chemistry type stuff as well.

That's new with the latest catalogue. Farnell have had the stuff "for
years"

I use both and CPC too. Do you know about

http://www.megauk.com/  ?

for PCB stuff

Stuart

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101 uses for a Pentium: No2 - A greenhouse heater.