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Re: H bridge RSG

Original poster: "LWRobertson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <LWRobertson-at-email.msn-dot-com>

Hi Ray and Steve

A classic coil discharges at some voltage, then
the RF oscillates around zero, approximately. The
H-bridge never stops at zero, but goes straight
from +V to -V, and oscillates there, adding the
RF amplitude to the DC voltage.

Advantages are very reliable firing, it will never
power arc, and the primary voltage is doubled,
adding some oomph. I would think it should work
well for MOT power supplies. It can be run at any

The disadvantages are the necessity for a largish
storage capacitor, also rated for RF; and the huge
voltage reversals, probably +2V to -2V almost.

At the moment its running on a 8 inch rotary with
a maximum of 240 BPS. I'm (slowly) getting parts together
for a 12 inch which should be good for 360 BPS,
and ultimately hope to make a 22 inch with 24
electrodes. Expensive, though.

Its a simple enough circuit - I'll be glad to send a
schematic if you want.


  ----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, May 19, 2001 9:25 AM
Subject: H bridge RSG

> Original poster: "Ray Haynes by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> I'm moving full speed on my MOT powered DC coil and was searching the
> archives (that's what they're for, right? ;-) ) for information. I found
> postings about an H bridge RSG. There were some comments about how that
> approach charged the cap with alternate polarities and that this might be
> hard on the cap. I didn't see any resolution on that.
> Question (rhetorical?):
> Since the tank cap forms a resonate circuit with the primary and resonate
> circuits oscillate back and forth charging the cap first one way then the
> other, doesn't that mean all caps used in the primary tank circuits must
> happy with AC charging? Also this seems to indicate that the alternating
> charge cycles of an H bridge RSG are not a problem, true?
> Ray