RE: flyback transistor choice

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Svensson" <david@xxxxxxxxx>

Hi Scot! Well I think if you want more output you need to get a
 Bigger supply transformer. My experiences with flybacks are limited but
have you considered the ZVS driver:
http://uzzors2k.googlepages.com/mazzilli_zvs.png

That one will get you loads of current but will require up to 40 volts
at 10 ore more Amps. I've tried that one nice arks and fairly quiet to
Hope that helps sincerely/David


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: den 26 mars 2007 06:36
To: tesla@xxxxxxxxxx
Subject: flyback transistor choice

Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>

Hi All,
     I'm not sure if this is the right place to ask this, but I'm
sure sombody out there will be able to help me.  I built a few of
those simple flyback drivers with the single 2N3055 transistor and I
have experienced a few problems.  They are a bit too weak to drive my
12in argon filled plasma globe, unless I parallel 4 transistors, and
that blows out my step down transformer (it pulls like 6 Amps, the
transformer is rated for 2, and a single transistor pulls about 1.8
A).  Is there a better transistor I can use?  or will I be forced to
get a huge step down transformer.  Any input would be appreciated,
and if this is the wrong list for this, I can go elsewhere, it is no
problem! (but I'm sure sombody out there knows what to do).
Scott Bogard
P.S.  the frequency shifts all over the place with just one, making
consistant plasma impossible at low pressures, but this goes away
with 3 or more transistors.  Also, I need a transistor that won't
make an audible scream, as my sister will kill me whenever I come
home (she hates the noise with a passion, I'm not too fond of it
eithor, which is why I like the 3055, it is reasonably quiet).  Thanks.

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