Re: [TCML] looking for a nice tank capacitor...problems...

["Quarkster" <quarkster@xxxxxxx>]

Mike -

Before going out and blindly buying more capacitors, why not try to find out 
why your current capacitors are "blowing up"?

(Incidentally, I think it's very unlikely that any Chinese-made capacitors 
you may purchase on eBay are truly "rated for Tesla coil duty", regardless 
of what the seller may claim.)

First, can you reiterate your coil's design specifications:
1. What are the voltage and current ratings of your NST?

2. Are you using a variac to run the NST at greater than nameplate input 
voltage?

3. What are the specific details of your MMC:
 a) Value and voltage ratings of the individual capacitors, and if all the 
capacitors in your MMC are identical;
 b) Number of series-connected capacitors per string;
 c) Number of parallel strings used;
 d) Peak current rating of capacitors.

4. What type of spark gap are you using, and what is the total gap spacing 
you were using when the cap "blew up"?

5. What was the coil doing just prior to the capacitor failure?

6. How did the capacitor fail (what did you see)? Did smoke come out? Did 
the case split open? Did you see internal arcing? Etc, etc.

All this information will help find out why your capacitor failed, and how 
to prevent repeat failures with remaining capacitors in your MMC, or with 
additional capacitors you may add to the system.

Regards,
Herr Zapp



----- Original Message ----- 
From: "mike osipowicz" <yosip1115@xxxxxxxxxxx>
To: "tesla request pupman" <tesla@xxxxxxxxxx>
Sent: Friday, October 02, 2009 1:46 PM
Subject: [TCML] looking for a nice tank capacitor...problems...



hello everybody, sorry for the bad punctuation, I am in a hurry... I 
received some nice 15kv, 20 nf capacitors from china, only to have one of 
them blow up... they are rated for tesla coil duty by the way... I need one 
tank capacitor, around 30kv, or more, with either 10 nf, or 20, if it has 
10, I will add it to my mmc, if it has 20, then bye bye mmc... thanks guys, 
Mike O.
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