From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: RE: SIZE of RF chokes? Date: Wed, 16 Nov 2005 18:23:37 -0700
Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
The current wisdom concerning chokes in NST protection circuits is to
not use them at all. Using just series-chokes without bypass caps
accomplishes nothing, and using chokes with bypass caps to form a
low-pass network creates new resonances just as or perhaps more
hazardous as the RF from the tank circuit. Instead, use an R-C low-pass
network. Please see a detailed discussion of this topic on my web site
- http://www.laushaus.com/tesla/protection.htm. Also, make sure your
main spark gap is fed by your protection network, rather than your cap.
I had all kind of trouble with stuff arcing to where it shouldn't when I
used air-core chokes, so your safety gap firings may be related to this,
or maybe not. But there's no point to creating a second tier of safety
gaps.
Regards, Gary Lau
MA, USA
> 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.
>
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> --------------------
> 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.
>
> _
>