Re: Flyback Driver PCBs

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

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

Thats plenty impressive.  The problem with Aron's flyback driver is that it
is limited to 15v input.  I had the same driver for a while but I was using
a TL494 so I could put up to 40v into it.

If you're saying you get 4" out of a single flyback at 25v you're either
lying or not measuring right.

At 25v on the primary I can pull a 3" arc before my small flyback (which has
a 1" diameter secondary) Starts to arc over internally.

This is similar to Steve's flyback driver except it uses a TL494 for better
control over the flyback with adjustable duty cycle.

Once again,  a switch is a switch.  If the flyback is in resonance you'll
get the same sparks on any half bridge in the world if you're driving it at
the same voltage

Did I mention I wasn't running my flybacks in resonance when I was pulling
these 3" arcs.  I just set the frequency around 30KHz and I'm sure if the
flyback was in resonance it would perform much better.

Once again,  this isn't a thread to elaborate on my spark lengths.  It is to
ask whether there is interest for a flyback driver PCB.

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 12, 2004 9:53 AM
Subject: Re: Flyback Driver PCBs


 > Original poster: "Dan" <pbursa-at-cfl.rr-dot-com>
 >
 > two inches arc with halfbridge driver ? that's really not impresive. With
 > HVguys simple flyback driver I can get 3-4 inches -at- 25V and Steve Wards
half
 > bridge driver does easy 5 inches -at- 60V.
 > I suggest you work on your design a bit ;-)
 > regards - Vladan
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Monday, April 12, 2004 2:01 AM
 > Subject: Flyback Driver PCBs
 >
 >
 >  > Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
 >  >
 >  > Hello List:
 >  >
 >  > After the recent sucsess of my SSTC boards, and my recent
experimentation
 >  > with a high powered flyback driver,  I have decied I'd like to have
some
 >  > flyback driver boards made.
 >  >
 >  > The boards would be custom 2 sided boards,  utilizing a half bridge of
 >  > MOSFETs or IGBTs,  and a variable oscillator and gate drive section.
This
 >  > would work wonders as a flyback driver and as a GP high frequency
 > generator
 >  > for different experiments.
 >  >
 >  > The board would use a TL494 oscillator, that way the duty cycle and
 >  > frequency would be variable.
 >  >
 >  > I recently built an identical flyback driver and it works very good,  I
am
 >  > able to drive flybacks with half wave AC up to 150v or until they start
to
 >  > break down from overvoltage (about 50v in)  and I have been able to get
2"
 >  > sparks from a single small flyback (a new style DC one).
 >  >
 >  > Anyway if there is any interest in these please let me know and I will
 > send
 >  > word to have them made.  I have already designed the board and things
seem
 >  > to look good.
 >  >
 >  > Regards - Jim Mitchell
 >  >
 >  >
 >
 >