Hi Bob -
Thanks for the reply. You have to understand, I am not a technical
person. As I understand it, I should use a constant current to make my cs,
right? What would that kind of unit actually be? Is it some sort of
transformer?
I'd like to make a quart at a time. With the constant current, what should
the shut-off current be? I'll be using .9999 silver coins that are 1 oz
each. How do you actually adjust the current? How long would you brew it?
Considering that I'll be using coins, will they be immersed far enought into
the water? You were saying something about wet length of the electrodes
(that's the silver, right?). The coins will be spaced approximately 3"
apart. Will this be alright?
Also, about the constant stirring. Did I understand you to say that the
stirring is more beneficial than the fish tank bubbler? If yes, just where
or how can I obtain this sort of a device?
I liked Dr. Jons instructions because they were fairly clear to a layperson
like myself. But still, these nagging issues!
I realize these questions are probably pretty elemental to you, but I mean,
I'm starting at the bottom here and find conflicting info just everywhere!
Thanks for your help! By the way, I have been going thru the archives, but
it's pretty slow going and I have some rather urgent applications to attend,
so I really do appreciate the help.
Dot
----Original Message Follows----
From: "Robert L. Berger" <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: CS>generic co-op
Date: Tue, 29 May 2001 19:31:21 -0500
Dot;
Basically to make good CS one needs to control the elecrode spacing, wet
length of the electrodes, ans use constant stirring.
There are generally two system types used; constant voltage and constant
current. Each requires it's own set of cut-off paramters.
CONSTANT VOLTAGE;
Uses batteries or a power supply that has a fixed voltage, and the
current in the brew cell is monitored with a digital multimeter in one
lead of the cell. For a small amount 8 to 16 ounces with two #14 silver
wires as electrode the shut-off current is between 3 to 4 ma. for larger
amounts of DW then then current must be adjusted for the increased
electrode surface area.
CONSTANT CURRENT;
This uses a fixed power supply of 27 to 40 volts (can be higher) but in
one cell lead is placed a semiconductor unit that is wire as a constant
current source. This reduces the cell voltage by limiting the cell
current until the current reachs the set limiting value. At that point
the current stays constant.
In both systems constant stirring has been proven and has now been added
to all of the commercial units. Bubbling of air through the CS does not
supply the velocity between the electrodes to stop agglomeration of the
silver particles. This can de demonstrated with the laser pointer. It
shows up in the brightness of the Tyndall beam. The brighter the beam
the larger the particles and we do notwant that. In fact the very best
CS will have no T.E.
I hope this help answer your questions. If you have more send them. Also
visit the archives for aditional info.
I appreciate Dr. Jon's input even if it is antiquated. It is making more
people aware of CS. Remember he is an M.D. and so wemust allow him some
leaway :-)
"Ole Bob:
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