What's a good source for Ammonium Persulphate?

Digi-key doesn't have it listed and I haven't found it locally yet.

thanks
chuckc

----- Original Message -----
From: "Joan Ilari" <joan.ilari@TERRA.ES>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, March 06, 2002 4:28 PM
Subject: Re: [EE]: Making PCBs...


> Nick,
>
> I have seen your page explaining the pcb manufacturing process : VERY GOOD
!
> (http://www.veys.com/nick/electronics_tutorials/howto/tut2/ )
> It is a pity I haven't seen it a couple of years ago when I started with
> this
> method to manufacture my pcbs ! It would have spared me a lot of trial and
> error hours :-(
>
> I STRONGLY RECOMMEND THIS METHOD to anyone home-making his/her pcbs !
>
> Some points about the process that I would like to highlight :
>
> - To take out the toner when the pcb is finished it is much easier to use
> acetone (industrial or even of the kind the women use for removing the
> paint from the nails : more expensive) than grinding the pcb.
>
> - It is very important to use the appropriate paper. Do not spare on the
> paper : with glossy photoprint paper the success is guaranteed. I can make
> pcbs with tracks going through 2 IC pads (2.54 mm distance) without too
> much trouble.
>
> - As a reference : stay with the iron (full power) over the pcb board face
> up
> covered with a piece of cloth 1.5 minutes, moving the iron so as to
achieve
> a more uniform heating (not all the iron base has the same temperature)
and
> strongly press the iron against the board. Do not stay too much time or
you
> risk the toner spreading too much and getting tracks too wide.
>
> - To remove the paper it is better (according to my experience) to use
very
> hot water instead of cold water. In a couple of minutes the paper
peels-off
> without having to touch at it.
>
> >
> > For ease, nothing beats the iron-on transfer method.  You can use glossy
> > ink jet paper, laser print the layout on it and iron it onto the
> > copper-clad.  It takes a bit of finesse but once you figure it out you
> > can get pretty fine traces on there consistantly.
> >
>
> Cheers
>
>
>    Joan Ilari
>
>    Barcelona (Spain)    Tel. +34 93 431 96 39
>    joan@ilari.org
>
> ================================================================
>  ... I've seen things you people wouldn't believe. Attack ships
>  on fire off the shoulder of Orion. I watched C-beams glitter
>  in the dark near Tannhauser Gate. All those moments will be
>  lost in time, like tears in rain ... Time to die ...
>
>                                     -Blade Runner -
> ================================================================
>
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