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FW: Transformer Protection?
From: D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Sunday, November 30, 1997 4:04 PM
To: Tesla List
Subject: Re: Transformer Protection?
To: James Q
A simple inductor of 40-50 turns of #16 to #20 wound on a piece of 1 1/2
inch ID PVC tubing will clip the real HF spikes. Additional protection is
afforded with a resistor in series with the HV output between this inductor
and your HV source, ie, ignition coil. Resistance value is not critical.
We use a pair of 500 Ohm resistors, 50 watt rating, in parallel for 250
Ohms at 100 watts with neons. With an ignition coil a single 10 or 20 watt
unit rating 150-200 Ohms will work fine. These are vitreous enamel
resistor available at around $2.50 per piece directly from Digi-Key
Corporation, Thief River Falls, MN. You can call their 800 number for a
free catalog.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Transformer Protection?
> Date: Friday, November 28, 1997 9:51 PM
>
>
> From: James Quinney[SMTP:jquinney-at-hotmail-dot-com]
> Sent: Thursday, November 27, 1997 12:14 PM
> To: tesla-at-pupman-dot-com
> Subject: Transformer Protection?
>
> I have just built a HV power supply out of a 12V engine ignition coil. I
> haven't fired it yet however, because I think it may blow when the arc
> is created as it has no protection against short circuiting which will
> happen when the arc is made across the spark gap. I remember reading
> somewhere that you could put a light bulb in the circuit to protect the
> transormer against this. Does anyone have any more info on this? Maybe a
> circuit diagram?
>
> James Quinney
>
>