I have made CS with a lot of different voltage DC plug in wall power
supplies. 
I have used from 3 volts to 28 volts with a 1 Mill amp current limiter.
With lower voltage units you put silver closer together.
With a cheap multi meter you can measure voltage at no load condition which
is usually 
A lot more than rating. Example a 12 volt at 400 mill amp rating may put out
over
20 volts at no load. With a 1 mill amp current limiter you are very close to
no load.
Measure voltage at no load put silver in water and measure voltage across
silver.
Set silver apart at some voltage a little less than no load conditions.
This will optimize your voltage. After you have some CS made you can use a
little to 
Start new batch. Most of the cheap power supplies are unregulated which
means they put out 
The listed voltage at the listed load. A 12 volt at 400 mill amp is just
that.
It puts out more voltage at less load. The exception is regulated power
supplies which put out 
A constant voltage at various loads (these are the ones that cost more).
I measured a power supply I have for my rechargeable 1 million candle power
light.
At no load it measures 22.48 volts Dc, (12 volts at 400 mill amp rating)
this is close to what it would put out at 1 mill amp.
Harbor freight regularly put the cheap volt ohm meters on sale for less than
$10.
They will measure current also, not sure how accurate they would be at
measuring 1 mill amp,
But they measure voltage fine. I even had a pair of these volt ohm meters
mounted
On dash of boat to measure voltage on water injection pumps on engines
(another story).
They do work great on voltage and I checked them against a standard and they
were close.
I use Canadian Maple leaf coins, cheapest silver. I did buy some silver wire
and drilled 
Hole in coin and hung coins with a small S hook made out of silver.
Hope this helps any one wanting to make CS with a cheap home made CS
Generator.
I had found that the current limiters I bought would pass current in both
directions but 
The wrong way was less than the rating did not understand this but it was
so.
I sold a few of the limiters to friends and showed them how to set up to
make CS.
We even timed a few batches and measured the CS with my PTS, so they would
know how long to run batches.
Bob





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