Ooops The anode is the one with the little plus sign, right? I always
get 'em mixed up!
I am gonna try the shoelace trick.
I got this suggestion for my current regulation problem. Looks like I
need to make a trip to Radio Shack.
recommend using the LM334.
This will let you regulate currents way below 1 ma, should you choose to do
so, whereas the LM317 and other voltage regulators usually cannot regulate
current reliably below a few ma.
LM334s are available for less than $1 from mail order parts houses, e.g.
www.Jameco.com . A 330 ohm resistor will set the constant current to about
0.2 ma. If you search for LM334 (e.g. with Google, etc.) you can find and
download data sheets that tell you how to calculate a resistor value for a
given current. Or, just put a 22 ohm resistor in series with a 500 ohm
potentiometer and set the current to whatever you want. Put a milliamp
meter in series with the wire to one of the electrodes and set the current
by adjusting the pot, using already brewed CS as your current "load".
With adjusting the current to 1.2 - 1.6 milamp per sq in of anode area
should prevent the sludge buildup?
My power supply cuts into constant current mode about an hour into the
brew cycle( but is still too high.) I start out at 30 VDC and when the
brew is reading 12-13 on the PWT the voltage is being throttled down to
18-20 VDC.
If I use this LM334 curent limiter for a preset current to the brew
cell, I will need to set my power supply to provide more amperage than
my curretn setup, thius preventing the unit from entering the constant
current mode. Thus I will be using a steady voltage throughout the
process. Is 30 VDC the place to start? I can adjust from 0-32 VDC with
this unit.
Thanks for keeping me on my toes!!
Frank Welch
Brew Cell: Gallon Sun Tea Jar
cathode: 5" #14 .9999 silver wire
one inch separation
2 anodes: 7" #12 .9999 silver wire
air pump bubbler
brew temp: 120 f.
usual brew time 4-5 1/2 hrs
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