Re: Zero Crossing Circuit

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

Original poster: "spoonMAN by way of Terry Fritz <twftesla-at-qwest-dot-net>" <spoonman534-at-yahoo-dot-com>

Is it possible for this zero crossing circuit to be adapted
to build a static vars generator for power factor correcton
in say, NST's? I wondered if this might be an alternative
to PFC caps.. 

Ben McMillen

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Barton B. Anderson by way of Terry
> Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
> 
> Hi All - 
> 
> Just wanted to report that I built Jon Tebbs Zero
> Crossing Sync, Variable Delay
> Trigger Driver. 
> 
> I've fired up the trigger but haven't ran the coil with
> it yet. Maybe tomorrow.
> The circuit worked EXCELLENT right away! I can vary the
> delay the full range of
> the pot. I can hear the HEI trigger vary along the AC
> half cycle. The energy
> out of the HEI is incredible! It "sounds" like a real
> winner! I ran it for
> quite a while scoping out the delay. It appears to be
> varying the entire 90
> degree range, but I'm having a little trouble with this
> scope. The horizontal
> output transisitor (H.O.T.) does get quite HOT, so
> heatsink it well if you
> build this. 
> 
> I had everything needed for the circuit from gutted misc.
> components. I used a
> slightly beefier transistor at Q4. Also, I didn't a
> damping diode (per say), so
> I threw a MOT diode it it's place. All other components
> are either to the
> schmetic or very close. For C4, I used 2 Wima caps
> (SMD6560) in parallel for
> 0.066uF (possibly the reason for the high energy I'm
> seeing?). 
> 
> I put up a couple photo's of this board at my website.
> It's not a pretty board,
> but at least anyone interested can see the components I
> used and get an idea of
> the circuit. BTW, I also put up John Tebbs schematic. I
> added dots to junctions
> simlpy to clarify overlapping lines and connected lines. 
> 
>
<http://www.classictesla-dot-com/temp/JT.html>http://www.classictesla-dot-com/temp/
> JT.html 
> 
> After this email, I'm running out in the garage to fit it
> into the control
> panel. I'll be mounted the centertap transformer and
> board in the control panel
> and  simply running lines out to the HEI at the gap. I'll
> report back once I
> start running the coil with it. 
> 
> Take care, 
> -- 
> Barton B. Anderson 
> <http://www.classictesla-dot-com>http://www.classictesla-dot-com 
>   
> 
> Tesla list wrote: 
> >
> > Original poster: "Jon Tebbs by way of Terry Fritz
> <twftesla-at-qwest-dot-net>"
> > <jgtebbs-at-eos-dot-net> 
> >
> > Hi Barton, 
> >
> > > Is this circuit detecting zero-crossing, then
> delaying "from zero" when 
> > the gap will fire? 
> >
> > This is correct.
> > Cheers, 
> > -- 
> > Jon G. Tebbs 
> > <jgtebbs-at-eos-dot-net>
> 
> 
> 
> 


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