-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Simon Dodd
Sent: Thursday, January 22, 2009 9:18 AM
To: Tesla Coil Mailing List
Subject: 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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