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Re: Top Load

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Alan,

Yep, I did the same thing on a tiny mmc a couple years ago. It's one of those things easy to do because your paying more attention to the topside of the board after the soldering is completed. I remember wacking myself on the back of the head pretty hard.

Take care,

Tesla list wrote:

Original poster: "Alan Majernick" <rainylake@xxxxxxx>

Hi All:

Just fired up a coil I have been working on for about 8 months. Working fine
now but started out with puff of smoke on my carefully planed "Terry
Filter". I had the caps and MOV's properly spaced but the perf board I used
had copper clad holes. As I started to "turn up the juice" a spark raced
across and promptly took out one of the 1K ohm 225 watt resistors. Took out
the dremel tool and sanded off the copper in the offending area. Works great
now. I'm sure the veterans know about this, but I had never thought or read
about it. Maybe it will save someone the irritation...............

Love the list


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, July 03, 2006 10:45 AM
To: tesla@xxxxxxxxxx
Subject: Re: Top Load

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>

If it's too close to the top the top load begins to look like a
"shorted turn".  Best to experiment with some elevation.

Dr. Resonance
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, July 02, 2006 6:13 PM
Subject: Re: Top Load

>Original poster: "Krohns" <2halice@xxxxxxx>
>Hey D.C.,
>This is Hal in Tucson.  I finally fired my 4" coil last night for
>the first time.  It did quite well.  I'll have video on my site later
>I followed your advise and placed my toroid 2.5" above the last
>winding. Will raising it as much as 4" change the capacitance of the
>toroid or will it change the resonant frequency of the secondary or both?
>Hal in Tucson
>----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
>To: <tesla@xxxxxxxxxx>
>Sent: Sunday, July 02, 2006 11:02 AM
>Subject: Re: Top Load
>>Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
>>2.5 to 4 inches measured from bottom of toroid to the last sec
>>winding works good with small coils.  With large toroids above 30
>>inches dia., more shielding, we usually go 12-14 inches above last sec
>>Dr. Resonance
>>----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
>>To: <tesla@xxxxxxxxxx>
>>Sent: Sunday, July 02, 2006 10:04 AM
>>Subject: Top Load
>>>Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
>>>I have a question on the normal location of a top load. My new
>>>coil will max out at 13Kv .150ma , secondary is 6.5/8 dia , is
>>>there a standard starting point for the top load?  I see pictures
>>>of other coils, some show it several inches above the top of the
>>>secondary winding , others are quite low with the lower part of
>>>the top load below the plane of the upper winding of the secondary.
>>>Any suggestions on a starting point ?
>>>             Rich , from the middle of Missouri