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Re: Flyback Driver PCBs
Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
Okay boards began production today. They should be here by Friday.
Not only will this board be one heck of a flyback driver, it will also
drive a small SSTC if you use a different capacitor value in the oscillator,
and use IGBTs with anti-parallel stealth diodes.
Once again, the boards are availible. Price is 22$ each, I have as many as
anyone could want.
The board has everything on it to drive the flyback except the flyack
itself, a supply for the flyback and a supply for the logic (which can be
both if you want to run at low powers <30v)
You can use IGBTs or MOSFETs as the switching transistors in the half
bridge. All parts are readily availible.
If anyones interested, Electrontube-at-sbcglobal-dot-net I'm taking orders now.
Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, April 13, 2004 9:47 AM
Subject: Re: Flyback Driver PCBs
> Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
>
> Once again...
>
> There are zener diodes that are in seires with the mosfet gates,
obviously
> bringing the gate voltage down to 15v.
>
> There is no schematic. It is a TL494 driving two gate drive ICs, a gate
> drive transformer and a half bridge of whatever you want.
>
> IF you insist on telling me over and over again how wrong I am, I suggest
> you find something else to do, you're really not trying to be helpful but
> rather antagonistic. And no one wants to hear about this.
>
> Regards - Jim Mitchell
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, April 12, 2004 6:08 PM
> Subject: Re: Flyback Driver PCBs
>
>
> > Original poster: "Dan" <pbursa-at-cfl.rr-dot-com>
> >
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Monday, April 12, 2004 2:51 PM
> > Subject: Re: Flyback Driver PCBs
> >
> >
> > > 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.
> >
> > No, it's not. The 555 is. Gates of mosfets shouldn't see more than 20
> > volts. So TL494 -at- 40 V doesn't sound right( not to mention the fact
that
> > TL494 doesn't sink current.)
> >
> > > If you're saying you get 4" out of a single flyback at 25v you're
> either
> > > lying or not measuring right.
> >
> > Thats what I'm saying :-) Flyback # 8-598-998, four turns of primary
and I
> > AM 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.
> >
> > get better flyback :-)
> >
> > > 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
> >
> > Really ? why is there so many different types of flybacks, then ?
> >
> >
> > > 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.
> >
> > You didn't post any schematic and your description of output of the
driver
> > sounds rather un-exiting
> > Regards - Vladan
> >
> > > ----- 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
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
>