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Re: SIZE of RF chokes?



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi JT,

Do what you may, but you have a 30ma tranny and I^2 R is 1 watt. There will be other sources of power dissapation in the resister but I dont think efficiency is a reason to not protect the NST. Your first line of defense is a properly set safety gap. This will help the overvoltage but RF tracking in the NST's tar can still be a problem. If you do kill the NST, try to melt the tar to cure the carbon tracks.

Gerry R.


Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

adding a massive resistance will only make my entire system less efficient. It will reduce my current by...i am not sure, .5 to 5 percent

*****I would love a terry filter, but unfortunately i am a perfectionist, and have made my coil look very good. As a consequence of this, MANY components are very close together.

-I DOUBT I HAVE ROOM FOR A TERRY FILTER, NOT TO MENTION THE $. I have about 2" by 3.5" of space for a protection circuit

I can send TONS of images of my coil, and safety circuit. Want to see them?
Ill send some photos of the available space for my safety circuit too.

***** believe it or not, i dont know what LTR means.




From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: SIZE of RF chokes? Date: Wed, 16 Nov 2005 18:27:16 -0700

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>


Toss the chokes and add about 1000 ohm 100 watt resisters (one in each leg). Chokes use to be used but it has been shown that they can cause more problems than they solve due to parasitic resonances. You may want to search the archieves for the "Terry Filter" to properly protect your NST. Also LTR operation is recommended for NST's (1.6*Cres for static spark gaps and 2.8*Cres for SRSGs)


Gerry R.

Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>

I have read .1 to .3 millihenries.
On one of your threads, I just read .03 millihenries (30 micro)


PLEASE tell me- are my choke the right size.

-I have a 12,000 30ma neon, 60Hz
-Close to resonant capacitor (supposed to be 6.66nF, but its 7.8nF)


* My chokes currently are set up on BOTH sides of my HV circuit (both outputs of xformer)
* Each choke measures 7.4uH
* Both chokes are 80 turns of 19gauge wire, on an aircore form, .25 X 1.5" long


USING THIS...RANDOM..INFORMATION, CAN YOU TELL ME WHAT SIZE OF CHOKES I NEED, AND ARE MINE THE RIGHT SIZE ALREADY.
-----------------------------------------------------------------------------------------------------------------------------------
Plus: my safety gap fires frequently, but not too much. When it fires it becomes the sparkgap.
*So, should i make a SECOND safety gap after the first?
*Or, is it ok to fire as the sparkgap. In otherwords, when it acts as sparkgap, will overvoltage occur in my neon?



my safety sircuit is set up as:

transformer - connects to safety gap - connects to 7.4uH air chokes on both sides - rest of circuit

I KNOW I TYPED A LOT, BUT I NEED PEOPLE TO ANSWER ALL, OR MOST OF MY QUESTIONS. PLEASE ANSWER MY WHOLE EMAIL.

Thanks.

_