> Re: CS>RE: Current limitation Please check my math
> From: Robert Berger
> Date: Sat, 26 Apr 2003 09:27:03
> Hi Ed,
> First let us correct some errors.
[...]
> None of the LM series will work over 36 volts. You will have to
> find the drawing that was on this list about a year ago for a
> higher voltage arrangement.
> "Ole Bob"
A convenient voltage to use is 160 Volts, obtained by rectifying the
110VAC and adding a small electrolytic filter cap that charges to
the peak voltage.
The cap value should be about 10uF per mA, but a larger value is OK.
Most of the parts can be obtained from an old PC power supply for
next to nothing.
The power switch should be arranged to discharge the cap when power
is turned off. This can be a simple SPDT light switch from WallMart
for under a buck. The entire supply can be enclosed in a plastic box
from WallMart to minimize shock hazard.
A small 1:1 isolation transformer should be used to minimize
problems with the AC plug polarity making one connection hot. A
three-wire plug can be used, with the ground wire connected to the
negative silver rod. This minimizes the potential for shock, but
care is still needed when working with high voltage.
This generator will produce about 155-160V DC, which is large enough
that no current regulator is needed. This eliminates reliability
problems and the possibility of a short that would allow dangerous
currents to flow on the positive rod in the event of a failure.
Simply connect a 120k 1/2W resistor from the cap to the positive
silver rod. The short-circuit current is:
I = E / R
= 160 / 120000
= 1.33 mA
The short-circuit power dissipation is:
P = E^2 / R
= 25600 / 120000
= 0.213 Watt
A 1/2 W or higher value should be used.
The advantage of this approach is no seed material from a previous
batch is needed to obtain repeatable results.
The initial current in my system is 0.7 mA, and it quickly increases
to 1 mA as silver enters the solution. The initial voltage across
the rods is about 80V, and it drops fairly rapidly. At 25 minutes,
the current is 1.125 mA, and the voltage across the rods is 21V.
The final current in my system is 1.15 mA after one hour when I
usually stop the process. The voltage across the rods is then 10V.
the rods are standard 12ga with about 3" wetted area.
The anode calculates out to a little over 1 square inch:
A = pi * d * l
= pi * 0.125 * 3
= 1.1780972 sq. in.
This gives a current density of around 1 mA/sq. in.
"Ole Bob" posted warnings earlier on the production of nitrate and
nitric acid from dissolved nitrogen in the water when using high
voltage to drive the electrolysis.
This is certainly possible, but after a short time the voltage
across the rods is less than 30 V.
So I don't think there is much time to produce large quantities of
nitrogen byproducts, and after that point the system is identical to
the current-limited systems now on the market.
I don't know what the ppm is, but is is more than sufficient for my
needs. I have stopped swallowing the silver unless I really feel a
cold is coming on. I simply hold the cs in my mouth for ten minutes
then spit it into the sink. This has stopped several sore throats
during the winter, and got rid of a persistent cold sore.
My friend tried it and found the same results, and it also worked
for her teenage son. So perhaps we really need much less silver than
we think.
Best Regards,
Mike Monett
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