Hi Ivan and list,
There are so many ways to make a cup of coffee but it always ends up
tasting pretty much the same . I think this also applies to electronic
circuit design. You decide what it is you want and then try to figure a
way to do it. Everybody's brain works differently or we'd all be clones,
so here's the way I did it.
I wanted to make sure the unit shut off at a predetermined voltage which
would be indicative of silver concentration so the first thing was to
design a current regulator to continuously lower the voltage as the silver
was deposited in the water. That took a couple of transistors and
diodes. I also added another transistor circuit to sense the current and
operate an LED so it could check the water for mineralization at
startup. If the light comes on at startup, the water is no good. Toss it
and start over. Just another bell or whistle but a good one. Once the
water has some silver in it, the LED illuminates showing that the unit is
actually doing something.
Next, I added a voltage comparator which uses a zener voltage as an
accurate top reference voltage and a potentiometer dividing the voltage so
one can adjust the shutoff setting from high to low PPM. This variable
voltage feeds an op amp input and the changing voltage from the silver
production electrodes feeds the other op amp input. When the falling
voltage reaches the preset level, the op amp operates a relay to disconnect
the power from the electrodes. It also turns the LED off so the operator
can tell the process is done. I wanted a relay to make sure ALL voltage
was removed. Didn't want a small amount of leakage voltage to continue
producing colloid after the unit shut off because many people leave the
unit on and go away for long periods of time before returning to see
if the CS is ready. I wanted repeatability and accuracy.
Shut down occurs within .1 volts so the end results are pretty much always
the same.
I use a starting voltage of about 38 volts. This is gotten with a full
wave bridge rectifier and filtered power supply. No wall wart here. I use
a power transformer with dual voltage primary so I can make it operate on
120 or 240 volts AC. This lets European customers have a chance to try our
generator.
I also leave the stirring motor running until the operator shuts the whole
generator down so it continues to help reduce agglomeration while operating.
Hope this gives a general insight into one designers concept. I'm sure
there are many ways to do the job. Let's hear from others.
Trem
www.silvergen.com
At 11:59 PM 7/16/00 +1200, you wrote:
Maybe a voltage (or current) comparator opamp with a fet switch?
If any one nuts one out, please let me know.
Ivan.
----- Original Message -----
From: "Robert L. Berger" <bober...@swbell.net>
To: <silver-list@eskimo.com>
Sent: Sunday, 16 July 2000 06:14
Subject: Re: CS>Away too long
> Hi Erwin;
>
> I haven't found out how to program a relay with a selectable window
for shut-off.
>
> Given me a schematic and I will paly with it.
>
> No doctor just a crotchy old guy'
>
> "Ole Bob"
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