Re: A Difficult TC?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bigfoo39-at-telocity-dot-com>

Tesla list wrote:

> Original poster: "Ron Hubbard by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<hubbard_ron-at-hotmail-dot-com>
>
> Hi, all;
>
> Has anyone built the Tesla coil found at
> http://www.pupman-dot-com/current/vladi2/ubjt.pdf? I am tempted to build it but
> I can't cross-reference the transistor shown in the schematics and I don't
> know what to use as a substitute.
>
> And there are a couple of questions I need to ask more experienced coil
> builders. For sinstance, the part of the circuit with the diac and triac
> looks suspiciously like a common light dimmer and I was wondering if a cheap
> lamp dimmer could be used in place of that part of the circuit?
>
> And lastly, I have a piece of  nominal 1" PVC pipe (which is really 1.25"
> around)  that's about a foot long. I also have some surplus 18 gauge
> stranded wire on hand. According to the Wintesla program, if I make a
> secondary using that wire and piece of PVC as a coil form I should get a
> resonant frequency of nearly 2 MHz with a toroid; 5 MHz if the coil is
> unloaded. I need to know if the wire being both stranded and insulated would
> change the secondary's resonant frequency any.
>
> Ron Hubbard
>
> _________________________________________________________________
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Hi Ron...

the BTB ...  is a Triac 600VRM 8A sensitive gate

the MJ10084 is a NPN HV darlington power amp    700 BVcbo 500BVceo 8BVebo
Ic20 175W Hfe20 min TO-3
case    ECG-98   is a good cross.....

Scot D