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RE: Rotary Spark Gap Design

Original poster: "Terry Oxandale" <Toxandale@xxxxxxx>

A wooden disk, even if plywood, sounds dangerous at best if turned at any proper RPM. In addition to this, a 440VAC spark gap would have an almost impossibly small gap to maintain. In essence you would just about require physical contact of the contacts (e.g. brushes of sorts). The old spark-gap resonators used induction coils driven by a DC voltage, but used a "buzzer" of sorts to accomplish the pulsed DC wave form, but they were using a lower voltage than what you have proposed.

(Un)Terry

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, November 24, 2004 11:07 PM
To: tesla@xxxxxxxxxx
Subject: RE: Rotary Spark Gap Design


Original poster: "Stephen Mathieson" <sm@xxxxxxxxxx>

Stepping up the voltage means that you will be switching less current for
the same amount of power. I don't see 440VAC to be practical.

If you use a wooden disk it will probably catch fire.

Stephen A. Mathieson

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, November 24, 2004 9:32 PM
To: tesla@xxxxxxxxxx
Subject: Rotary Spark Gap Design

Original poster: "Rajesh Seenivasan" <rajeshkvs@xxxxxxxxxxx>

Dear forum members,

I'm planning to build a rotary spark gap:
8 spinning electrodes mounted on a wooden disc,
2 stationary electrodes,
brass bolts used as electrodes.

I have seen in some Tesla coil designs that the AC input voltage is stepped
up to few kilo volts
(using NSTs/PolePigs), rectified and then fed to the tesla coil circuit
that is using the spark gap.
Can I run the tesla coil without stepping up the AC input voltage ? I'm
planning to use
440VAC input, rectify it and then feed this DC voltage to the tesla coil
circuit which uses a
rotary spark gap. Any advice ?

Thanks in advance,
Rajesh.