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Re: [TCML] Nearly First Firing

I am reading 35 ohms across the whole capacitor bank. I got the caps from rmcybernetics website. They were sold as ideal for tesla coils, I will be looking at getting some of the big pulse caps from RS as soon as my bank balance is healthier... I now have 19 in parallel giving me .02uF give or take and my NST needs .01989uF for complete resonance so it should be OK. I will be waiting till later in the day to test again as there are a lot of businesses around me who would get very annoyed with me I feel...
Thanks again for all your help and anything else you can think of that may help me would be greatly appreciated. 
--
Simon Dodd
Director/ Technical Manager
Yes Boss Music


On 22 Jan 2009, at 13:41, Lau, Gary wrote:


Hi Simon,
OK - it's clear that the cap value is not excessively high. For an 8/50 NST @50Hz, a mains-resonant cap would be .02uF, so for an LTR design one would shoot for .03-.04uF. I think you presently have . 016uF.
So the NST looks good, but I'm not so sure about the caps. Are your caps disk capacitors? Ceramic caps are rarely suitable. Some doorknob caps are, but disk caps are never suitable. They tend to have high losses and consequently get hot, quickly, and die. And the temperature coefficient is awful, and change value as you look at them. Is it possible that one or more of them is shorted? It's not a definitive test, but what does an Ohmmeter read across them? 

Regards, Gary Lau
MA, USA


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Simon Dodd
Sent: Thursday, January 22, 2009 5:21 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Nearly First Firing

Ok, I just got an answer back from Tunewell and it turns out my
transformer is only 8Kv @ 50mA! I will be adding the relevant caps to my MMC and hopefully the rain will stop so I can try for test firing 2 
tonight! Hopefully with pictures or videos for you all to see!!

On 21 Jan 2009, at 20:20, Simon Dodd wrote:


Cheers Gary,
Its a conventional heavy core transformer as far as I'm aware. It is
an old one and its very heavy!!   The caps are high voltage ceramic
caps from rmcybernetics.com

Thanks

On 21 Jan 2009, at 20:06, Lau, Gary wrote:


Is the NST a conventional, heavy core and coil transformer or a
lightweight solid state inverter type?  You need the core and coil
type.

What kind of caps are these?

Regards, Gary Lau
MA, USA


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On 
Behalf Of Simon Dodd
Sent: Wednesday, January 21, 2009 2:42 PM
To: Tesla Coil Mailing List
Subject: [TCML] Nearly First Firing

Hi Guys,

I went for first light this evening!! Unfortunately there was
nothing!
My spark gap fires when there is no capacitor bank in place but as
soon as I put my MMC into the circuit and connect the main parts of 
the coil, the spark gap stops firing :-(  I am using a 10Kv NST
with a
static spark gap and 16, 20Kv 1000pf capacitors in parallel. These
are
from the calculations on deepfriedneon. The spark gap will fire if 
the lead to the outer ring of the primary is left unconnected.

Im sorry its not too clear, I can do a quick diagram if you want
more
info.

Thanks for your help again

Simon


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