Re: SSTC output looks more like SGTC output!

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

Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>

I think your on to something here with the RF problems.

When running with this large toroid, i felt a strong tingling sensation on 
my face.  Since then, i havent even thought about the larger toroid!  It 
seems that with my SSTC, the larger the toroid, the more problems i have.
Even with my new 1.25"x10" toroid (very flat looking), i get pri/sec sparks 
when i pull a flamming arc from the toroid.  So it seems i will just stick 
to my little toroids :)  Im surprised that my board survives the crap i put 
it through!  Also, with the larger toroid, i blew the 15A fuse. that really 
took me by surprise!  I guess my coil really is high power now!

Steve Ward


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: SSTC output looks more like SGTC output!
>Date: Thu, 19 Jun 2003 08:11:59 -0600
>
>Original poster: "Stephen Conner by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>
>
>At 20:10 18/06/03 -0600, you wrote:
>>Original poster: "Steven Ward by way of Terry Fritz 
>><teslalist-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>
>>
>>
>>Another thing to note is the apperance of the RF envelope.  When not 
>>drawing sparks, it looked like a pretty much round blob (the common 
>>look).  But when pulling arcs, the blob turned into a series of very 
>>short, but equal in amplitude blobs.  Seems like each blob was an output 
>>spark, and would explain the 5khz noise maybe.
>>
>>Any thoughts?  Maybe someone wants more information?  Please let me know, 
>>im kind of interested in this!
>
>Steve, it sounds like the new secondary is generating enough RF field to 
>feed back into your control circuit and cause it to 'squeg' on and off at 
>5kHz. In other words you might have accidentally turned your CW SSTC into 
>a pulsed SSTC, and the output from pulsed SSTCs is known to look like that 
>from a conventional spark gap coil.
>
>I had trouble like this working with the OLTC. Whenever I drew an arc to 
>ground, my stereo would start to make a terrible crackling noise, my scope 
>screen would go blank, and the firing rate of the OLTC itself would change 
>drastically. I think arcs to ground cause a kind of mini-EMP as the 
>capacitance of the toroid suddenly discharges through the low-resistance 
>streamer path. The bigger the toroid, the bigger the EMP.
>
>Screening the control box sorted the OLTC out, but didn't make the stereo 
>or the scope any happier :(
>
>Steve C.
>
>