Re: Sync Gap Timing (was Triggered Gaps)

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

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

It should fire at or somewhat after the voltage peak when the TC capacitor
(MMC perhaps) is at it's maximum charge.  Think of each end of the cap as
charged to opposite peaks.  Your want the primary to get the maximum voltage
and current across it.

I got frustrated with the light dimmer trigger and built a capacitor
discharge trigger.  It uses a comparator to detect near zero voltage from
the raw rectified wave form.  Some 555s and a couple SCRs and it adjusts
very nicely over most of the half wave.

Regards,

Pete Komen

 >
 > This has been asked before, but it keeps coming up, and always bugs me:
 > Do you want the gap to fire at the AC peaks and troughs, or at the zero
 > crossings?
 >
 > Seems to me you would want it at the zero crossings.  Between two zero
 > crossings, there is a rising, then falling, but always positive (or
 > negative) charge being applied.  Between a peak and a trough, there is a
 > positive then negative charge applied, cancelling each other.  No?
 >
 > (I'm assuming 120 bps)
 >
 > -  Bill  V.
 >
 >
 >