Re: solid state magnifier...accidentally...cool!

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

Original poster: "R Heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

on 10/08/01 5:11 PM, Tesla list at tesla-at-pupman-dot-com wrote:

> Original poster: "Mike Novak by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <acmnovak-at-msn-dot-com>
> 
> Sniperz below...
> 
>> 
>> Hello again, and again ; )
>> 
>> (all snips from Mike Novak)
>>> So I got mine running from 1kHz-347kHz...
>> 
>> Very cool. I didn't realize they went up so high, I thought they dropped
> off
>> at 100kHz or so. But it's not the first time I've been wrong ; )
>> 
> 
>> 
>> Hey, what else are flyback drivers for?!
>> 
> 
>> 
>> I used one of those "single transistor" flyback drivers once, with a 3055.
> I
>> also used a 10" by 10" huge heatsink for it!!!....and it still got warm.
> 
> I find it VERY useful to put a thermal cutoff switch on the heatsink beside
> the transistor to begin with. I'm thinking of making a copper/Aluminum
> heatsink like they use on processors. I find that the transistor feeding the
> 3055 gets real hot also, maybe I need something a bit heavier... I can't get
> a decent output if i current limit the draw to the small transistor. :-/
> 
> 
>> 
>> A flyback driven maggie....hm. Keeping in mind that the typical 3055
> driven
>> flyback operates anywhere from 5 - 30kHz, how in the world will you make a
>> secondary (extra) coil to resonate that low? Small wire, big coil, big
>> topload? Or do you plan to use a 555 driving a 3055...so you can get high
>> freq out of it? I'm sure that would work well.......check a 3055 data
> sheet
>> to see it's frequency range though.
> 
> Of course, I'll be using a 555 driven 2N3055....
> However, I'm hoping to aquire some higher power mosfets soon, the 2N3055s
> don't like anything over 20 volts. They are just little heaters :-))
> 
>> 
>> What I have done before.....this is cool now.......is use the output of a
>> flyback THROUGH A SPARK GAP and tank capacitor.........into a tesla coil
>> primary.....to drive a secondary coil in the old-fashioned way!! It was
>> really cool. 2" tiny, tiny, arcs, but extremely high frequency (drove a 6"
>> lighbulb wonderfully) and was really neat. Tank BPS was 20kHz! Very safe
>> compared to that of a "conventional" tesla coil operated at 60Hz from the
>> wall.
> 
> I tried that once, and got similar results, but the sound was worse than a
> 2kW spark gap TC. Maybe not louder, but much more annoying :-o
> I got some 32 gauge wire to wind a tertiary coil tonite... Aiming for
> 200kHz, as 555's signal will decay a bit at higher frequencies.
> 
> On a side note, I messed around with that plasma globe again today (10"
> radioshmuck with driver removed... boy, they sure don't make em like that
> anymore :-/). I got some REALLY cool effects with it. I changed the
> frequency (coarse and fine adjustment pots now), current to the base of the
> 2N3055, and voltage input. I got anything from bright, acitve streamers to
> dull, fat, "phantom" streamers as Tesla would say :-)
> 
> I think it might be possible to build a solid state version of his
> "Disruptive Discharge coil" featured in "The amazing inventions of Nikola
> Tesla". I forgot where I have it posted, but I scanned it last year and I
> think it's on a nbci-dot-com account... Unfortunately, I lost the URL :-( If
> anyone still has it, please let us know!
> 
> Thanks and safe coiling to ya,
> 
> -Mike Novak
> 
> 

just as a suggestion I have had much better luck with the RCA 40411
transistor than any 2N3055. The aN3055 gets hot and burns out easly.
     Robert H