RE: TSG question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-qwest-dot-net>" <pkomen-at-zianet-dot-com>

Hello Mark,

In a sense, yes, but...

I don't know what happens if the ignition coil is fed a sine wave.  What is
desired from a STSG is a short high voltage pulse every half cycle at the
same time in the cycle.  A sine wave fed coil wouldn't produce that timed
pulse.  In an ignition system the HV pulse is produced by a sudden build-up
or collapse of the magnetic field in the coil.  A capacitor discharge
ignition uses the build up and the old points and condenser ignition uses
the collapse of the magnetic field produced when the current flow is
interrupted as the points break contact.

Sine wave driven, the output of the coil would not have a high dv/dt (change
of voltage with respect to time) and timing would depend on the gap spacing
if it worked at all.    On my STSG, I can vary the trigger pulse (I haven't
tried to scope the coil output.) from very early in the half-cycle to very
late (About 1.7ms after zero crossing to 7.2 ms after zero crossing.) and
still get the same energy in each pulse.

I may try driving a coil from a sine wave just to see what happens.

Regards,

Pete Komen

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, January 17, 2002 12:33 PM
To: tesla-at-pupman-dot-com
Subject: TSG question

Original poster: "Stolz, Mark by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Mark.Stolz-at-st-systems-dot-com>

Hi All!

I have been contemplating building a TSG and was wondering something.  If
you used a 120 volt to 12 volt transformer(like a doorbell transformer) to
the ignition coil, wouldn't the coil be operating synchronously with the
mains frequency?  I don't know so I thought I would ask.

Thanks,

Mark Stolz
Houston, TX