RE: oops ("Kickback" and untuned coils)

• To: tesla-at-pupman-dot-com
• Subject: RE: oops ("Kickback" and untuned coils)
• From: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 24 Mar 2000 12:19:39 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Ed:

I'd like to come to a better understanding of the hazards of coiling to
appliances, and in particular, just what are these ill-defined demons.

I don't understand your suggestion that an untuned coil is more prone to
sending HV transients over the AC line.  My current thinking has it where an
untuned coil is simply not efficient at transferring the primary energy to
the secondary, so the energy languishes in the primary tank circuit for a
longer than desired time, burning up energy in the gap and putting more
cycles and wear and tear on the tank capacitor.  But I don't see any
mechanism for this energy to get back to the AC mains any more-so than in a
tuned coil.  While the duration of each "bang" ringdown is longer, the
magnitude of any coupled transients would be no greater.

Regards, Gary Lau
Waltham, MA USA

>Original Poster: "Edward Wingate" <ewing7-at-rochester.rr-dot-com> 
>
>IMHO it was not a coincidence! An untuned Tesla coil with no EMI  filters
>between
>the line and the Tesla coil power supply can EASILY produce enough kickback
to
>send almost any solid state device into the great beyond, and the
>microprocessor
>in a microwave oven display qualifies as a fairly sensitive device that
>will not
>withstand such an assault.
>
>Brad, do you have EMI filters on the line into the power supply?
>
>Ed Wingate RATCB

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