The power supply is a purchased bench supply, 0-50 volts.
The polarity switcher was nothing more than this little fellow:
http://www.grainger.com/Grainger/wwg/productIndex.shtml
wired up to reverse the polarity every cycle.

Marshall

HRBE wrote:

> Thanks Marshall,
> I appreciate the time taken to send me the posts.
> Any chance of a schematic of your power supply and the polarity switcher?
> John
> ----- Original Message -----
> From: "Marshall Dudley" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, March 16, 2006 3:07 AM
> Subject: Re: CS>Stirring CS
>
> > The top is pretty crowded, but clean.
> >
> > In the picture you can see the aquarium with the silver wire (which has
> > since been replaced with silver plates), and the top with the pump in it,
> > the lab supply supplying 35 volts, and in front of the supply is a
> > polarity switching relay that switches the polarity once a minute, and
> > between that and the power supply is a 7805 voltage regulator with a
> > resistor to give a 40 mA constant current (it is the small black square
> > just under the black terminal of the power supply).  To the right is a
> > yellow meter I use to monitor the voltage across the anode and cathode,
> > and in the front is a TDS meter and a laser pointer. The tube to the
> > right  goes to a 55 gallon drum with a magnetic pump and a flow meter on
> > it, and the tube on the left is the overflow that goes to the 55 gallon
> > holding tank (it is almost hidden by wires going to the outlet strip).
> >
> > Marshall
>
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