Re: Bottle Capacitor Values

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi,

One should never run an NST with a cap on the output and nothing else.  The
output voltage could easily ring up until something blows up.  Even large
LTR caps can cause the NST's shunts to saturate causing very high currents
to flow until something blows up.  Even a spark gap in the circuit will
directly short the cap (no inductor) and cause big current spikes that
could damage the cap.

You need at least a spark gap to limit the voltage and a primary coil or
'big' 10 ohm resistor to limit the current.

Cheers,

	Terry


At 12:45 PM 8/31/2002 -0700, you wrote:
>My original junkbox coil used four, 750mL wine bottles
>in parallel for 6.6nF (verified with one very cheap
>Chinese and one very expensive Fluke DMM using cap
>function). That's 1650pF per bottle. These were
>water-clear glass with straight, parallel sides,
>abrupt, rounded shoulders, and short necks. I filled
>them with brine and covered them with foil right up to
>the junction of neck and shoulder.
>
>While I had my paws on the expensive Fluke meter, I
>measured a few other 750mL wine bottles of various
>shapes and colors. These all came in between 1200 -
>1900nF.
>
>Tank cap value is not super critical. These numbers
>are close enough to get you sparking.
>
>Regards,
>
>> does anybody know of some way to (inexpensively)
>> measure, calculate, or
>> estimate capacitance values of bottle caps? 
>> 
>> -Chris
>> 
>
>
>=====
>Gregory R. Hunter
>
>http://hot-streamer-dot-com/greg
>
>__________________________