Re: Async gap with rectified NST PS

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Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

Aric,

At 1,400 BPS, I believe you may exceed the power capability of your MOT
doubler to charge the tank cap.  At only 400 BPS the current draw of my MOT
doubler/charger is 150 ma.  So at 1,200 BPS, your current draw would be 450
ma, assuming you had a beefy enough power supply.  800 BPS may be the
practical limit.  Remember, the transformer current will be twice the output
current in a doubler.   Usually the oven diodes are only rated for 350 ma.
Also, at the higher BPS, the charging reactor gets hot probably from
increased eddy currents of a KW or so of several hundred Hz power flowing
through it.

So I hope you have several different pulley combinations so you can try for
the higher RPMs in stages, making measurements (and watching for smoke!)
along the way.  Let us know your results.

--Steve


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, October 22, 2001 8:06 AM
Subject: Async gap with rectified NST PS


> Original poster: "Rothman, Aric by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Aric.Rothman-at-Honeywell-dot-com>
>
> I am in the middle of construction of a high break rate (~1,400 bps)
rotary
> spark gap.  It will consist of a phenolic disk with belt drive from a 3450
> motor, with appropriately sized sheaves to increase the rotational rate of
> the disk.  The intended power supply will the MOT voltage doubler with
> charging inductor as described in Greg Hunter's site.  In the event that
> performance is poor or the power supply self-destructs (I am concerned
about
> insulation breakdown in the MOT charging inductor, making it a charring
> inductor :), I would like to use NSTs as backup.  I would rectify the NST
> output, thereby protecting them from the async gap tendency to otherwise
> allow excessive voltage rise in the tank circuit.  Will this work without
> putting the NSTs at too great a risk?  The Maxwell caps I am using will
each
> have there own spark gap protection.
>
> Aric
>
>
>