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Re: Help me to choose capacitors for MMC

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

Hi Tomas,
Not so easy to do. I looked at the axial polypropylene caps and although similar in construction, the data was somewhat illusive. I looked at the 150nF cap at 1200VDC rating. I did not the ESR is twice as high as the pride CD 942C series. I thought it odd that the ESL was not listed. Anyway, as with any unknown (especially caps for MMC use), it's often a matter of testing them in application to find out if they are worthy or not. Apparently your somewhere in Europe, so your looking for a cap and manufacturer of equivalent or better than what were using here in the US. It may be that these caps are fine, but I think your really going to have to test them to " be sure". We had to do the same thing through quite a few different manufacturers and cap types. If I were you, I would call the manufacturer and discuss the application with them. Let "them" tell you if they will be likely ok or not. Talk to an cap engineer if at all possible (don't talk to a sales or customer service person). BTW, when you do that, simply let them know you want to discuss a particular high energy application with an engineer to see if their caps would be suitable. They will most likely get you to someone knowledgeable. 

Take care,
Bart

Tesla list wrote:


Original poster: Tomas Stankevic <Tomas.Stankevic@xxxxxxxx>
I'm going to buy capacitors for making MMC. should choose from ELFA catalogue. http://www.elfa.se/en/. I want to use 3 500W NSTs in parallel, so I need about 40-50 nF for at least 10 kV. Later I will need one more MMC for my bigger coil but I dont have transformer for it yet.. 

Please help me to choose which type of capacitors should I buy.

Thank you

Tomas





Tesla list wrote:


Original poster: "Anthony R. Mollner" <penny831@xxxxxxxxxxxxx>

I want to know more about using an internal primary. It seems like it would
be over coupled but, I have no idea really. How is the coupling figured out
with an internal primary?

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, April 10, 2007 6:33 PM
To: tesla@xxxxxxxxxx
Subject: [PHISH] RE: Tesla coil on Ebay; 80-300' lightning?


Original poster: "Hans Schattenmeister" <klugmann@xxxxxxxxxxx>

Operating at 6 kW (220 X 30 Amps) you would be luck to get 80"
discharges. I remember a guy who was running a 38 kW coil and getting
55' - 105' arcs. The coil was 5' in diameter, had an internal primary
and stood about 25' tall.









>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Tesla coil on Ebay; 80-300' lightning?
>Date: Sun, 08 Apr 2007 18:56:27 -0600
>
>Original poster: "M G" <gt4awd@xxxxxxxxx>
>
>Sometimes I check ebay "Tesla coil" to see if there is anything new
>that I would like to get. While searching I run into an auction
>where a coil is being sold for just about $15,000. The description
>says that it can create verticle streamers 80-300' straight up in
>the air. Looking at the coil you can see the primary does not have
>that many turns, and considering the secondary is so large, the
>capacitor must be huge. I have my doubts that this coil can create
>streamers that long using only 220volts at 30amps. It also seems
>that this coil is being sold to anyone willing to pay the high
>price, regardless of electrical knowledge, which is a bad idea in my
>opinion. Here is a quote of the entire description.
>
>http://cgi.ebay.com/Giant-Megavolt-Tesla-Coil-for-Special-effects- HUGE_W0QQ 
itemZ220099893593QQihZ012QQcategoryZ4665QQrdZ1QQcmdZViewItem
>
>"Do not turn on near airports or other sensitive installations.
>Generates Giant Lightning bolts from 80 to 300 feet tall going
>straight up. Uses 220 volts single phase at 30 amps. Noise will wake
>the dead. Might bring them back to life to, dont know for sure but
>dont try it to be sure.. I will not help you re-bury anyone you
>re-animate. This is not a toy. Buyer will be responsible for pickup
>and transportation. This was custom made for my boss by the same guy
>who builds them for Hollywood Special effects people in the 80's.
>Built into Mahogony wood furniture, control will support remote
>activation ( while under cover ). Comes with various books, papers,
>letters and a hard back rare collectable Tesla book too. This is not
>somthing you will see again in your lifetime. No its not UL
>approved. Resulting display can give goosebumps, make women flee and
>children to become incontinent. Use proper discretion when
>activating, recomend out someplace away from everything important.!
>Does set off EMP detectors at the Feds Nuclear Monitoring stations,
>it looks like a 10-15 ton nuke going off on the detector. Have fun."
>
>----------
>Create and Share your own Video Clip Playlist in minutes at Lycos
>MIX (<http://mix.lycos.com/?if_Event=MAILmixtagline>http://mix.lycos.com)
>

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