# RE: why TC Different from others?

```Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>

Josh -

According to the Tesla Coil Construction Guide it all started in 1856 when
Lord Kelvin found that if an energized capacitor is connected in parallel
with an inductance a train of dampened oscillations will occur in the
electrical circuit. In the 1890's Nikola Tesla found that if an air core
transformer with a tuned primary is connected to a capacitor the dampened
oscillations would induce high voltages at high frequency in the secondary
coil. Tesla obtained a patent for this invention in the late 1890's. The
Guide also shows you how to build Tesla coils with sparks from 1 inch to 8
feet.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, December 20, 2002 9:37 PM
To: tesla-at-pupman-dot-com
Subject: why TC Different from others?

Original poster: "J Dow by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jdowphotography-at-hotmail-dot-com>

To all

I am an average guy that got into coiling. I'm fairly intelligent and a
quick learner so coiling wasn't all that hard to pick up once I started. I
was never educated in electronics. So please forgive this question.

A TC primary and secondary form a transformer. The TC transformer produces
RF when it operates. 1. Why don't other transformers with similar winding
ratios produce RF?

The TC transformer is part of a "Tank" circuit. The Capacitor the primary
and secondary "Ring" or oscillate when the capacitor discharges. As I
understand it, the Pri, Sec and Cap oscillate at (RF) very high frequency.
2. Why doesn't a NST or other transformer Ring at RF when it is part of a
tank circuit?   Or perhaps it does. 3. Why do we get 60hz when it rings at
higher frequency?

Basically I want to know why a TC seems to work differently than other
transformers.