[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Capacitor
Original poster: "Sean Taylor" <sstaylor@xxxxxxxxx>
Yes, too much capacitance is bad - for 2 reasons.
First, the NST that you're using is going to have a hard time charging
a capacitor that large sufficiently. Second, it's going to be hard to
tune the coil with that capacitor - you'll need very few primary
turns. At the very least, I would put the two caps in series so
you'll have 0.11uF. Stil quite a bit too large for that transformer,
but closer!
Lastly, I don't know about the suitability of those caps for TC use.
Generally, X-ray caps are DC filter caps only and aren't designed for
the high peak currents that they will see in a TC tank circuit.
Sean Taylor
Urbana, IL
On 6/27/06, Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: "Hajdrowski, Leo T." <leo.hajdrowski@xxxxxxx>
Hi All,
One quick question.
I just finished helping my son build a coil:
15 kv, 60 ma nst with full wave rectification
Secondary 10.5" x 30" #22GA wire
Primary 3/8" 10 turns copper tubing flat coil - 1/2" spacing between
winds
1" spacing between primary and secondary
First windings of secondary approximately 1" above primary.
Stationary spark gap with 1/4" spacing
20 amp variac
30" dia. Torroid
(2) .22uf 90KV capacitors in parallel (They came from an X-Ray machine
and are about 4" dia. X 18" long).
We only get about an 8" spark and no corona.....it doesn't appear to be
high frequency, more like a step-up xfmr.
Is too much capacitance bad?
Thanks...Leo