Re: Any Geekgroup MMC failures out there??

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Luke,

Took my MMC bank to work today and took a few photo's. I think it will be 
pretty easy to see what I did from the photo's. I used this bank mainly on 
a small 4.5" coil (which I'm now using as the tertiary coil for the 
magnifier). So this cap bank isn't currently in use, just sitting off to 
the side temporarily.

The reason I did this was to vary cap arrangement at will (and it works as 
a base stand for the coil placing the cap bank directing under the coil base).

http://www.classictesla-dot-com/photos/mmc/mmc.html

Take care,
Bart


>Original poster: Bart Anderson <classi6-at-classictesla-dot-com>
>Hi Luke,
>
>Nope, no pics of that. I'll take the MMC to work tomorrow and snap a 
>digital picture so I can upload it. I'll let you know.
>
>Take care,
>Bart
>
>Tesla list wrote:
>
>
>
>>Original poster: "Luke" <Bluu-at-cox-dot-net>
>>You wouldn't happen to have a picture of your MC set up on the PVC
>>
>would
>
>
>>you?
>>I haven't made mine yet and would like to see a new idea.  Maybe it
>>
>will
>
>
>>spark a thought.
>>
>>Luke Galyan
>>Bluu-at-cox-dot-net
>>
>>-----Original Message-----
>>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>>Sent: Sunday, January 18, 2004 10:19 AM
>>To: tesla-at-pupman-dot-com
>>Subject: Re: Any Geekgroup MMC failures out there??
>>
>>Original poster: Bart Anderson <classi6-at-classictesla-dot-com>
>>
>>Hi Terry,
>>
>>Well, I've had one cap bite the bullet. This happened about a year ago.
>>I
>>was the 1st to receive caps from The Geek Group many moons ago. These
>>are
>>the 942C series 0.15uF caps. The one that that died was the cap next to
>>one
>>of the brass bolts I used for a connection. There's a hole in the cap
>>about
>>1/8" from the end. I don't believe it an arc from the bolt to the cap
>>occurred since the hole is on the opposite side of the cap, however,
>>something odd occurred. It was "not" from over volting the cap but I
>>believe RMS current. I believe I was running 5 strings of 12 for
>>0.0625uF
>>total at the time. The caps were set on a pcb with 10M resistor
>>
>soldered
>
>
>>across the cap on the opposite side of the pcb. Each cap from side to
>>side
>>had at least 1/2" clearance. Plenty of room there. I suspect I exceeded
>>the
>>rms current capability (25 amps).
>>
>>I've since rebuilt the entire cap bank onto an 8" pvc tube. Each
>>resistor
>>is now soldered across the cap and each cap is simply placed on screws
>>protruding from the pvc tube (this way I can maneuver cap arrangements
>>anyway I like). It is currently 3 strings of 18 caps for a total C of
>>0.025uF. I haven't had a failure since.
>>
>>I'm not sure why the cap failed. It's still on the pcb board along with
>>5
>>neighboring caps. I just threw it up in a cabinet and left it there
>>
>ever
>
>
>>since.
>>
>>Take care,
>>Bart
>>
>>Tesla list wrote:
>>
>>
>>
>>>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

msnip..........