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Efficient Coil
From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
Sent: Thursday, June 19, 1997 6:34 PM
To: Tesla List
Subject: Re: Efficient Coil
>
> From: davide-at-exit1.i-55-dot-com[SMTP:davide-at-exit1.i-55-dot-com]
> Sent: Wednesday, June 18, 1997 5:13 PM
> To: Tesla group
> Subject: Efficient Coil
>
> My son made a very efficient coil for his high school science teacher a
> few years back. Even though it was constructed rather poorly, it was
> able to produce 12 inch sparks from approximately 180 watts input. The
> power supply was a 6000 volt, 30ma. neon transformer. The primary
> capacitance consisted of 4, .01mf. 8,000 volt glass-tubed (mylar?) caps
> in series. The spark gap was just a single static gap with brass bolts
> set at approximately 1/8". The secondary winding length was around 12"
> long x 3" diameter on schedule 80 gray PVC. The primary was a flat
> spiral type with 6 turns of 12 gauge copper wire, tapped at the fourth
> turn. The terminal capacitance was a oblate from a brass chandelier.
> The spark length was measured by a ruler held up to the output
> terminal. This would seem to better the 200 watt per foot of spark
> length by 10%.
>
> Dave Euans
>
>
Dave,
That does indeed sound like quite an efficient TC. Good for your
son! If those caps *were* mylar, going to a good poly pulse cap
would probably increase the output performance even further.
rwstephens