No, but adding current control is not too difficult for the handy. You
want to add a ccd (current controled diode to your circuit).
I have added a old discussion post from my archives to help.
Chuck
Two can live as cheaply as one what?
On 10/7/2009 7:01:41 AM, Thora Rasmusen (Home)
([email protected]) wrote:
> You speak about current controlled. I have a homemade 3 x 9 volt EIS maker
> with 2 Canadian Silver dollars. Is that a controlled current?
>
> Thora
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From: pfwag
Date: Mon Jul 25, 2005 3:44 pm
Subject: 10 CS tips pfwag
Offline
My 2 cents:
1. If you don't know what you are doing stay away from taking apart
computer power supplies, or any power supply for that matter, to
make high voltage CS generators. What you don't know will kill you
a lot faster than not taking CS if you catch the Bird Flu when it
hits the USA, probably this fall or winter.
2. Despite maybe a thousand hours of research on CS over the last 6
years, I haven't seen any conclusive evidence that HV AC is any
better than low voltage DC for creating CS. Nor have I seen any
reliable evidence from anybody on particle size versus AC/DC or
voltage. Most of what you see is marketing hype from people selling
CS or CS generators.
3. What is known is that high current, from an AC or DC source,
results in large particles and that large particles are not
bioeffective and that too large of particles will give you agryia.
I have not, however, discovered what the maximum silver particle
size is that can pass through harmlessly. From everything I've seen,
it would appear that patient creation of CS using low voltage DC and
current limiting does not create too large of particle.
4. The simplest and easiest way to accurately limit the current in a
low voltage DC CS generator is to use a current limiting diode
(CLD). Put one in series with one of your DC leads and it will
automatically limit the current flowing to whatever the current
limit of the diode is. You can get CLDs in values from 0.22mA to
4.7mA.
http://www.microsemi.com/datasheets/1N5283_5314.pdf
You can buy them at:
http://www.mouser.com/catalog/622/287.pdf
If you want to limit your current to 1mA you would use a 1N5297
(although a diode with a value on either side of 1mA is much
cheaper). Note that CLDs are put in reversed biased (backwards) so
that the cathode side of the diode (the side marked with the bar)
faces the positive voltage. If you put it in in forwards it will
act like a rectifier diode and be doing, basically, nothing.
However, if your DC power source isn't current limited with a
resistor you might burn out the CLD. You will also have created
large CS particles long before that occurs.
If you buy a 1mA DC ammeter (or a DC multimeter with a low DC amps
scale) and put it in series the CLD you will see your brew start out
with no detectable current flowing for a while and then gradually
build up to the limit of the CLD. How long that takes depends on the
purity of the water. Seeding with a little CS from a prior batch
will speed up the process.
If you start with a higher voltage source (27 - 48VDC) it will go a
little faster. NOTE: any voltage source above about 50VDC can KILL
you under the right circumstances - usually involving water - if it
is not severly and correctly current limited (typically to 1/4mA).
5. Most of the commercial CS generators that you see for sell do not
even have the simple but very useful technology that a CLD and DC
ammeter will provide you.
6. You can power your CS generator from 9V (it will take much
longer) or three 9VDC batteries in series (they will last a long
time) or an AC/DC source (check surplus electronic parts sources
such as Digikey) such as 24V (very common) or 48V (not so common)
AC/DC wall or desktop power supply. With an AC input, you can then
buy a cheap appliance timer and set it to run for however many hours
you want. However, with a CLD, turning it off is now not as
critical.
If you do buy an AC/DC power source, don't worry about the wattage
because even at 48VDC and 5mA that is only 1/4W - an AC/DC supply
will typically have far more.
If you use a low voltage AC wall source (cheaper and more common
than DC sources) and want to make an AC CS generator, you will need
2 CLDs. Or you can turn an AC source into pulsating DC by using a
rectifier diode (1N914, 1N4000, etc) in series with the reversed
biased CLD. Add a capacitor (e.g. 10uF/50VDC) and you will have a
constant DC source.
7. If you want to experiment with high voltage DC generation, get a
DC/DC converter module (i.e 12VDC to 5,000VDC). They will also
generally be inherently current limited so you will have less of a
chance to kill yourself when making CS. Mouser and DigiKey probably
carry them, although they will be a bit pricey.
8. If you want a cheap and reliable source for bonafide 99.99% pure
silver, buy a Canadian Silver Maple Leaf silver dollar. That is 10
time purer (1/10 the lead!) as the more common 99.9% silver. I've
heard the new US Silver Eagle is just as pure but I am no where near
going through the two Silver Maples Leafs I bought years ago so
haven't researched that. Most people (especially on the internet)
advertising anything more than 0.9999 or 99.99% silver are either
ignorant or liars. While 0.99999 (99.999%) silver is available it
is very expensive.
9. If you swallow a silver dime or quarter, or even a Silver Maple
Leaf, in a glass of water you will have a high silver PPM but it
won't do you much good. What you want is smallest particle size. A
smaller particle size with the same PPM means more particles in your
body killing pathogens. Remember, most silver passes through your
intenstinal tract with only a small portion being absorbed along the
way. What is absorbed is totally expelled after a few days. (Unless
the particles are too big in which case they get stuck in the skin!)
10. A TDM meter does not really measure PPMs. True measurement of
PPMs is hard to do and relatively expensive. What you should be
more interested in is in creating the smallest silver particle size.
Unfortunately, that is even harder to measure. However, if you are
near a university, or better yet are on facility or a student, check
with the chemistry department to get your CS analyzed. They will
have the right equipment and often students will do it for not too
much $$$. Bird Flu is coming and you might wnat to make sure your
CS is the best - it might be your only hope, outside of faith in
God. Once you know what you are actually making the TDM
measurement, with everything else being the same, will help assure
repeatability.
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