An economic 30" spark coil

• To: tesla-at-pupman-dot-com
• Subject: An economic 30" spark coil
• From: Finn Hammer <f-hammer-at-post5.tele.dk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 13 Feb 2000 15:21:01 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I just have got to do some more publicity for this silly small coil that
I have made, because it is cheap, fun and low voltage.

The specs are a secondary with 920 turns on a 4" by 13" form.
Topoload is now a 4" by 14" ducting toroid.
The primary is flat strip, 5 turns, 1/4 inch spacing.
The gap is 8mm thoriated tungsten rod clamped in copper bar, single gap
ground to something intended to resemble a rukowski profile. 
The HV-Supply (hardly) is 2 mot`s of the cheapest flavour. I buy them in
germany for something like 7$ apiece. 
The current limit is set by one choke, around 60 mH.

And the capacitor is now 56nF /1600 VDC KP/MMKP 376 pulse caps, 4
strings with 2 in each string! 

And this is perhaps the bottom line about this coil: The capacitor only
costs 10$, and the rest is really scroungeable.

The output is: continous connected arc: 22", with an occational Maveric
arc to the ceiling, measuring 30".

This particular specimen is going to deliver visual impact to an
interpretation of Frankensteins Lab, where it will produce a 15" arc
between 2 4" brass balls on top of the tank where the monster is
suspended in liquid, so it is on the way out of my hands, but I feel
like making more work with low-voltage coils.

I frankly cannot imagine a better beginners coil.

Cheers, Finn Hammer

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