was Re: depotting/ now flyback circuits

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

Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>

Tesla list wrote:
> 
> Original poster: "jimmy hynes by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<chunkyboy86-at-yahoo-dot-com>
> 
> why should i wind my own primary? ive een alot of
> websites that say to do that but whats wrong with the
> primary thats already on there? does it have too many
> turns?

Most flybacks nowadays are also swithing power supply transformers for
the unit.  Thus they are likely to have too many turns to run off of
12-30V, which is what I would suggest.  Its much easier to work with
that primary voltage.  And you can get just as high a voltage with 30V
on 20-30 turns of primary as you can with much higher voltages.  Its all
a matter of control- with your own primary you control the efficiency of
your design.  If you do not have PSpice, download the latest demo
version from Orcad, and I can send you a schematic of my old single
2N3055 design which beats the push-pull designs on all fronts.  Rob.




> 
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "rob by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>
> >
> > Hi Jimmy,
> >
> > Find all of the windings and which pins they connect
> > to using an
> > ohmmeter.  Then ground one pin from each set of
> > windings.  That way you
> > are certain to have the HV ground return grounded.
> > Then wind your own
> > primary with 20-30 turns of wire on the ferrite.
> > After that you can
> > build either the self-oscillating type of driver or
> > the tuned driver.
> > There are schematics all over the web for this type
> > of circuit.  Rob.
> >
> >
> > Tesla list wrote:
> > >
> > > Original poster: "jimmy hynes by way of Terry
> > Fritz <twftesla-at-qwest-dot-net>"
> > <chunkyboy86-at-yahoo-dot-com>
> > >
> > >  i tried using melthene cloride and it didnt
> > really
> > > work, so im going to try using a dmm to find the
> > > primary. but there are 11 pins and 3 wires going
> > in!
> > > where do i start? there are 9 pins in a U shape
> > and
> > > two more on the side,and there is a red and a
> > green
> > > wire going into the base and a wire coming out the
> > top
> > > with a suctioncup. i know the suction cup one i hv
> > but
> > > im confused about the rest. can any one tell me
> > where
> > > to start?
> > > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > > > Original poster: "rob by way of Terry Fritz
> > > > <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>
> > > >
> > > > Tesla list wrote:
> > > > >
> > > > > Original poster: "rheidlebaugh by way of Terry
> > > > Fritz
> > > > <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
> > > > >
> > > > > Jimmy: not all potting can be removed with
> > > > solvent. Those that can are
> > > > > usualy soften with Methylene chloride or
m-snip