Hi Tony,
I use a circuit with a LM338T in a current control configuration although a
LM317T can also be used with exactly the same bias/control values (I prefer
the LM338T as I have read in a few places that in current control
application its much better behaved than the LM317T especially in Low
current scenarios such as <2ma which is where my setup needs to be (also
forget <1ma its pretty much useless for that - which is why I only use it
with large silver electrodes at 1.5ma ( I will be migrating to a LM334Z
setup ASAP due to its much vastly more superior characteristics especially
for the home brewer, However the LM338T is very easy to control and bias
with resisters that are easy to obtain - hence why my current setup is based
on this)
For details see
http://users.telenet.be/davshomepage/current-source.htm
I have also used a LM334z which was very, very well behaved, when I wanted a
travel Silver Generator for holidays, I used a flat 6 inch by 1/4" wide
electrode and 2x9 volt batteries set at 0.3 ma. Although it took 10 hours to
produce 300ml at 18uS reading. Electrodes spaced 3 inches apart, and no
agitation.
The LM334z is exceptionally well behaved for low current and has an
excellent voltage range!...Operates from 1V to 40V, Programmable from 1µA to
10mA.
Although because of the resister bias values it is a real pain to control
with resisters, my advice is to use a variable multiturn resister of some
sort to tweak it accurately, and to include diodes to correct for
temperature since its very sensitive to temperature.
http://www.ti.com/lit/ds/symlink/lm134.pdf
see page 7 for the diode temperature compensated diagram
and see below for the calculator
http://www.a-ling.net/alweb/hifi/lm334_ccs_t_calc/lm334_ccs_t.htm
I hope this helps
Peace to all
Asif.
--------------------------------------------------
From: "Tony Moody" <a...@new.co.za>
Sent: Friday, January 20, 2012 7:47 PM
To: <silver-list@eskimo.com>
Subject: Re: CS>PPM vs uS
Hallo Asif,
Thank you for your detailed info. I have saved it because (I think) it is
info that is not common
knowledge here. What sort of current control are you using. I use a
simple fet circuit for the
1mA setting and it seems to work very well. I'm not sure that will
reliably turn down to .25mA
with a rod 1^2" area. Must try it soon.
Regards,
Tony Moody
On 20 Jan 2012 at 16:14, Asif Nathekar wrote about :
Subject : Re: CS>PPM vs uS
I asked the question and didn't realise that I kicked the hornets nest!
All I wanted to know is what ppm I was producing given a particular uS
reading!
But I have learnt a lot!
Since I am using a very low current per area and my electrodes are very
large and far apart, with current control I am producing high ionic
content CS ( i believe) and therefore my setup will not be very
representative of anything typical to anyone else and so I stop when my
Us
says around 20us , since it seems to be very stubborn to increase much
after that anyways indicating its done as much as it can. The CS is clear
and metallic tasting and very effective to myself and others. Since I am
happy with that I will leave it to that and think no more than that On a
side note. I used to use a much higher current 1ma per square inch with
less than double distilled water and was then able to produce CS much
faster and could brew it high enough to produce a slightly yellow brew.
Since I now double distill and use a very low current per square inch
(0.25ma per square inch) I haven't yet produced anything other than clear
CS and haven't even needed any mechanical stirring as I previously did.
Although to produce. 3 litre batch takes 48 hours! Patience is a virtue.
Since there is no yellow tinge and with my low current setup, I am happy
my CS is of a good quality meaning the particles aren't large enough to
absorb and reflect light and filter it to make it appear yellow or
otherwise( again it is only my belief ). I will therefore now leave it be
since its "good enough". Thank you again for the discussion. And please
continue educating and helping those like myself who seek knowledge and
those who are new to all this. Peace to all Asif.
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