Re: I need help with my crappy coil

• To: tesla-at-pupman-dot-com
• Subject: Re: I need help with my crappy coil
• From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 18 Apr 2000 20:18:55 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: "m0neyfromyuba" <m0neyfromyuba-at-netzero-dot-net>
> 
> I need some help my coil only makes one inch sparks
> 
> Transfomer: an MOT thats current limited to about 0.45 amps by a oven
> heating coil.
> 
> Tank cap: MOT cap-2100 volts .7 microfarad
> 
> Spark gap: single gap 1/16 inch
> 
> primary: flat spiral 9.5 turns of 0.125 inch copper wire. outside diameter
> is 7.5. and inside diameter is 2.5 inches.
> 
> Secondary: 9 by 1.5 inch secondary on a pvc. Total turns 656

This coil is severely out of tune with 0.7 uF at the primary and no
top load at the secondary. I calculate that the primary is resonating
at 39 kHz and the secondary at 1.7 MHz. 1" sparks is very good if
you gave the right values... (0.7 nF? Looks closer, but is too small)
You have to use a smaller primary capacitor, in the nF range, and
less primary turns if you want some output. A terminal at the secondary
will allow a larger primary capacitor and more power at the output.

Antonio Carlos M. de Queiroz

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