I am using the PS-30 from Pride Communications in my setup and making
crystal clear CS (EIS) a gallon at a time 4 - 6 times a month.
The few brown floaties and sludge build up arent as big of a problem as
my wanting to tweak my process and increase the quality of my CS. (Hey
'Old Bob'! where do you buy the shoelaces you use?)
This is a 30 VDC/ 3 amp adjustable power supply but will only adjust
reliably down to 0.01 to 0.02 amps. I am looking to put an inline
current regulator (LM 317 or similar) on the cathode line. There is a
chart that shows the different current outputs with different resistors
installed between the "output" and "Adjust" terminals but I cant find
it. Does anyone know where this is on the web?
With my current setup approx surface area of the cathode is 3.554 sq
in. Some recommend 1 milamp per sq in. of cathode area..some recommend
up to 3. Either way I need to regulate my current to 3.554 milamp
(0.003554 amp) or 10.662 (0.010665 amp). What milamp - to - surface
area guidelines does everyone use? Just off the cuff.....I could run 3
identical brew cells and regulate it with this power supply, or just
increae my total cathode surface area to over 10 sq in. That would take
40 inches of #12 wire. (Just trying to maintain some perspective.)
My Wal-Mart DW starts out at 0.6 to 1.0 on my PWT and I brew until it
hits 12-13 usually and it drops down to 10 - 11.5 after a day or two.
This is the same as when I used only one cathode but the Tyndal effect
is much less pronounced (with a laser pointer) with the two cathodes.
I am using 2 cathodes now but am thinking about upping it to 4 or 8 to
increase the surface area. (Yes Bob, I am still reading your plots!) I
have heard that the correction factor of 1.2 is not accurate when you
increase the surface area of the cathode? Does the correction factor
increase, decrease, or become totally unreliable?
Suggestions?....Advice?.....Discussion?.....
Thanks!
Frank Welch
Brew Cell: Gallon Sun Tea Jar
anode: 5" #14 .9999 silver wire
one inch separation
2 cathodes: 7" #12 .9999 silver wire
air pump bubbler
brew temp: 120 f.
usual brew time 4-5 1/2 hrs
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