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Re: questions on first tesla coil



Original poster: "Langer Giv'r" <transworldsnowboarding19@xxxxxxxxxxx>

hey instead of a variac in series with the NST primary, would a dimmer switch work too?? thanks
Daniel from Canada



From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: questions on first tesla coil
Date: Sun, 09 Oct 2005 16:17:35 -0600

Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Dan,

I have a 9/30 NST that works well that is described here if you can use any ideas off it:

http://hot-streamer.com/TeslaCoils/MyCoils/SmallCoil/SmallCoil.htm

More below:

At 12:04 PM 10/9/2005, you wrote:
Hi, i am building my first tesla coil and i have some questions i need to ask before i can begin... first off... i am planning on using a 9KV 30mA NST for power supply, MMC at 0.009mF 15KV for caps, 12 turns on primary and 900 turns on secondary.

Go to 12.5nF!!! It is far safer for the NST!!!

1)  Does this look okay or anything need changin?
2)  Do i need a filter for my NST?

They are sort of expensive, at least use a properly adjusted safety gap!!

3) Im too poor for a variac what should i do?

You can put like a 500 watt light bulb in series with the NST primary to act as sort of a low power option. That will drop the power down so you can do low power testing. Otherwise, get a real good power switch that you can operate "fast" ;-))


4) What does a safety spark gap do?

If the NST voltage gets too high, it will arc over and keep the NST from blowing up. A 12.5nF cap will be far less likely to do damage too.


5) what specs of caps should i use for MMC, like how many rows and such.

I have not done that stuff in like 4 years and I am all rusty now ;-))
Maybe someone else knows. I still have 56nF Panasonic caps if they would work better for a 9/30 NST... I think it would take too many Geek caps...


I am thinking a 9 x 2 of the Panasonic caps would do it...12.44 nF at 14.4kV...

Let me know and I can send them to you.

Cheers,

        Terry



Thanks a lot
Daniel from Canada


From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Terry Filter On Two NST Grounds?
Date: Wed, 05 Oct 2005 00:11:17 -0600

Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

Hey Miles,

If your are just charging "one" primary cap, then you "should" just need "one" filter. I am not sure how you are wiring the outputs of the NSTs...???

I would "guess" that the inner legs off the NSTs would be at ground too???

Cheers,

        Terry


At 07:12 PM 10/4/2005, you wrote:
Fellow Coilers,

My NST array is composed to two "layers". The bottom layer has four 7.5KV
30ma NSTs, cheap on e-bay, wired in parallel, with their cases all wired
together. This is NST ground 1. The top layer has four 7.5KV 30ma NSTs,
cheap on e-bay wired in parallel, with their cases all wired together. This
is NST ground 2. The case grounds from layer 1 or from layer 2, and from
mains power are NOT connected together. Do I need two Terry Fritz Filters,
one for the top, and one from the bottom? I really want to just set this one
off and see what it is going to do, but I will risk all the expense and time
of building these very large, very hard to wire, transformer stacks.


Please Advise,

Miles Waldron

_