A common quarter watt resistor does just fine at around 36 volts and a
few milliamps.
If it gets hot, get bigger
Ken
At 06:48 PM 11/22/2006 -0800, you wrote:
Dan,
Thanks for that response. What I am about to construct is the following
experimental generator. The cathode will be a piece of stainless steel
tubing that will sit on a nylon base inside the glass container. This base
will center the tube in the glass jar and support it at three points, in
an elevated position so that water can circulate under it. The glass jar
will sit on the inverted can/night light heater described elsewhere. Thus
the heated water in the center will flow up the immersed s/s tube and flow
over it, flowing downward against the colder glass surface.
At a distance of about 1.5 away from the inside or outside surface of the
s/s tube, I will position four, long, U-shaped 12 gauge silver electrodes,
at positions 12, 3, 6, and 9 oclock with respect to the circumference of
the s/s tube as viewed from the top. This will provide a lot of silver
surface for the anode and a lot of s/s surface for the cathode. From here
I need some help from the experts on how to select diodes, resistors, etc,
and how to mount them in the circuitry to provide regulated current at the
suggested 0.002 amps. Ken suggested a 20KOhm resistor, but did not mention
the watt rating. I am assuming that the watt rating of the resistor is the
peak wattage that the dc generator can put out, i.e 12 watts for a 30 vdc
and 0.400 amp output. In this case I can find a 50 watt, 20K Ohm resistor
for my application.
Does it make any difference how the resistor is hooked up, meaning which
side the power enters and which side it exits? I am sure that it makes a
difference in diodes. Amazingly, no one at the electronics supply store
that I visited knew anything about circuitry. Real professionals!
Peter
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