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Re: [TCML] c/w multiplier coil
Firstly, never directly short a multiplier. You are short circuiting the
caps through the diodes and they die. Use a series resistance to limit it.
Secondly, when running a multiplier in to an inductive load there will be a
resonance with the caps and inductance. After the first half cycle the
multiplier will be feeding into not only a short circuit but an equivalent
voltage in the REVERSE direction resulting in a huge current and the diodes
die. Ie a 10kV multiplier will face a 20kV short circuit.
I have seen more than one person seem surprised when they blow multipliers
because they don't realise the above 2 points.
I built a 4 stage single MOT multiplier yesterday which runs about 70mA 8kV
DC referenced to earth ie 560W. It is 12kV open circuit. This is a lot more
than an NST (even a 15/60) which would only manage open circuit 7.5 X 1.4 =
10.5kV no load referenced to earth and guessing about 7.5kV under 40mA
(300W) load rectified.
I use a 50 or 100K 200W resistor as a load or part of that as a series
resistor if I want to pull some arcs. Works nicely for short runs.
Peter
www.tesladownunder.com
----- Original Message -----
From: "Clive Hansen" <mrclivehansen@xxxxxxxxx>
Hello Everyone,
Some time ago I built a Crockroft-Walton multiplier to quintuple the
voltage of a power supply for use with a small coil. Recently, the
multiplier was hissing and losing a lot of power to corona. So, I decided
to operate it under oil in a coffee can since it is a small multiplier. I
sunk the whole multiplier in a coffee can filled with motor oil. The can
is metal, but the components are all at least 3/4 inches from the sides.
The assembly worked exceptionally the first several times I ran it.
However, when I power it up now, there are no sparks from the coil.
Directly shorting the multiplier yields only 2-3mm long sparks which are
very faint, whereas before it would produce 1.5in sparks when shorted.
Also, when powered on, the transformer makes an odd clicking noise which I
did not notice before. Does anybody know what the problem is here?
Thanks,
Clive
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