Re: Flyback farm?

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

Original poster: "Jonathan Peakall by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jpeakall-at-madlabs.info>

Hi all,

Before reading this, remember that I am pretty ignorant, so just 'cause I
didn't pull it off sure doesn't mean it can't be done.

I tried taking two identical flyback, and making them into a center tapped
xfrmr, meaning I attached the grounds of the secondaries together. I used a
push pull type transistor driver. It would work for a second, then blow a
transistor. It seemed random as to which one it blew. Diodes didn't help,
and I ran out of transistors before I figured anything out. Maybe someone
with more knowledge could figure it out, but I gave up.

Regards,

Jonathan Peakall

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, August 11, 2002 8:34 PM
Subject: Re: Flyback farm?


> Original poster: "David Speck by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dave-at-davidspeckmd-dot-org>
>
> I believe that the pots adjust voltages taken off a voltage divider from
> the main HV output, to feed the focus and brightness grids of the CRT.
>  I don't think that they will affect the main output voltage.  However,
> slight differences in output voltage would matter little when the system
> is under load.  Previous posts have mentioned paralleling neon sign
> transformers of different voltages with little performance loss.  I know
> that flybacks are different, but I bet that small differences in output
> voltage wouldn't be a problem.
>
> IF they installed all the diodes with the same polarity, (which they
> certainly should), then you should be able to parallel these units for
> higher current.  Most of the time, builders ignore the original primary
> windings, and put 5 or 10 turns of new primary wire on the core to drive
> the coil.  If the new primary wire were well enough insulated, I'd bet
> you could series two or perhaps more coils for higher voltage output, as
> long as they were also phased the same way.  You'd have to float the
> cores to avoid breakdown problems.
> Dave
> G2-1170
>
> >I have a number of flyback transformers all with integral rectification
and
> >would like to know whether or not these can be paralleled for extra
current
> >output.
> >These newer flybacks have two pots on the side for focus and brightness
and I
> >would be interested  to know whether these could be adjusted to set the
> outputs
> >to equal voltage in a circuit where a 555 oscillator drives several
flybacks
> >via separate transistors.
> >
> >
>
>
>
>