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Re[4]: Terry filter

Original poster: Sebastiaan Draaisma <sebas@xxxxxxxxxxxxxxxx>

Chiang Mai, Tuesday, March 8, 2005

In reply to: Terry filter
Posted by:
Posted on: Tuesday, March 8, 2005

Hello Gregory,
Thank you for this information, good and easy explenation! :)

Best regards,
Sebastiaan Draaisma

Tesla> Original poster: Gregory Hunter <tesla_39560@xxxxxxxxx>

Tesla> It is a simple formula: the voltage (E) across a
Tesla> resistor (R) is equal to the product of the resistance
Tesla> times the current(I) through the resistor (E = I x R).

Tesla> Suppose you applied the output of a 15kv/60ma NST
Tesla> across a 1000 ohm resistor. 1000 ohms x .060 Amps =
Tesla> 60v. Even though the NST can produce a potential of up
Tesla> to 15kvac, the 1000 ohm resistor will never "feel"
Tesla> more than 60vac. 15kvac is what the NST can produce
Tesla> when open-circuit. Across a non-reactive load, the
Tesla> voltage will decrease as the resistance decreases. The
Tesla> most extreme example is if you simply short the two HV
Tesla> leads together. At zero ohms, the voltage will drop to
Tesla> zero and the current will self-limit to 60ma.

Tesla> This is very similar to how an NST works when it is
Tesla> connected to a neon sign. When a neon sign is first
Tesla> switched on, the neon fill gas is essentially an open
Tesla> and the NST voltage quickly spikes to 15kvac. However,
Tesla> as the high potential ionizes the neon, it gives off a
Tesla> pretty glow, and its resistance quickly breaks down.
Tesla> The voltage across the lamp falls to about 800v. This
Tesla> is sufficient to maintain the 60ma conduction once it
Tesla> has gotten started. From then on, the NST behaves more
Tesla> like a ballast than a high voltage power supply. The
Tesla> NST is really just a self-starting luminous tube
Tesla> ballast.

Tesla> Does that help any?

Tesla> Greg

Tesla> --- Tesla list <tesla@xxxxxxxxxx> wrote: