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Re: Capacitor Help
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Hi Malcolm,
Tesla list wrote:
Original poster: "MalcolmTesla" <tesla@xxxxxxxxxxxxx>
Thanks. I got the strike ring make tonight too
http://www.v8-ranger.com/temp/tesla/19.jpg
I wasn't sure if I was supposed to connect one end of it to earth or not?
When using a strike ring, wire it to RF ground which is separate from
your mains house ground. I use copper pipe hammered into the ground
for RF ground. The bottom secondary is also attached to RF ground.
And I made my capacitor bank or MMC as I believe it's called. I also put 10
Meg 1/2 watt resistors across each cap as suggested.
http://www.v8-ranger.com/temp/tesla/20.jpg
http://www.v8-ranger.com/temp/tesla/21.jpg
The MMC looks like .05uF total if using the 0.15 CD caps. Realize
that the cap bank is set at only 12kV. I hear some build their MMC's
to the transformers Vp, but yours is barely at an rms rating. It may
be wise to up the rating to at least Vp. My MMC is derated to 36kV
which is higher than others have built their MMC's to. I kind of
built it bullet proof, but others have done well just at a Vp rating.
Others may have comments there.
Still need to make the safety gap across the MMC and wire up the HV stuff.
Oh and winding the secondary and building my torid are the last two major
things.
Do I adjust the safety gap across the MMC slightly larger than what ever my
spark gap gets set at? 1/8" or 1/4" wider, maybe?
I put my safety gap across my sparkgap. This allows the safety gap to
act just like the sparkgap and the energy is felt across the
inductance, unlike a cap, where a sudden discharge across a cap can
be damaging to the cap because the discharge is felt across the cap
(as opposed to across the primary inductance).
The safety gap should be adjusted to where the transformer will not
fire across it (it's there to protect the transformer, and if
adjusted too wide, it then serves no purpose, and the cap discharge
can damage the transformer secondary windings from excessive voltage,
especially on NST's). Once installed into the system and running, you
may have to do some "slight" adjustments. If you find your safety gap
has to be adjusted oddly wide; stop. There may be something wrong and
you don't want to put the transformer at further risk. This topic
will likely come up again once your up and running.
Take care,
Bart