Re: modern flybacks with diodes --- is there a simple diode removal procedure?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>

Al,

I have removed or bypassed the diodes on many different flybacks, and it is
usually not that hard. I work in an after school electronics program at my
local high school, and kids often want to play with flybacks. I use a
variety of methods, but my first choice is a dremel tool with a cutting
wheel. Often all we do is make a series of slits, making sure to start where
we will land on the diode. Then move back towards the windings. Once you get
to the base of the diode, you can just stuff a wire into the slit, then ape
or glue it in place. Not as good as a soldered connection, but we have done
that many time with good results.

Also, there are still many older flybacks out there to be scrounged without
the diodes. Dr. R used to sell a monster one without diodes, but I don't
know if he still does. I find the newer ones to be kinda wimpy anyway, which
is perfect for high school students, but not so much for more advanced
experimenters.

Jonathan
www.madlabs.info

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Some people are like a Slinky .. not really good for anything,
but you still can't help but smile when you shove them down the stairs.
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----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, March 05, 2007 11:12 PM
Subject: modern flybacks with diodes --- is there a simple diode removal
procedure?


> Original poster: "alfred erpel" <alfred@xxxxxxxxx>
>
>
> Hello all,
>
>
>          Small modern flyback transformers are cheap, but as far as I
> know, they all have diodes potted inside of them.  The potting on
> these flybacks universally seems to be impervious epoxy.  Does anyone know
of:
>
> 1) a low cost (under $25), in production, diode-less (AC output) flyback?
>
> 2) a simple method of mechanically incising the diode from a particular
>     model of low cost, in-production flyback without destroying everything
>          else
>
> 3)  a method to remove the epoxy from some particular in-production
flyback
>            (the least likely IMO)
>
>      Besides the obvious benefit of those who want AC from a flyback,
> I was thinking that the secondary coil of a flyback could possibly be
> a good lowcost charging inductor for a DC tesla coil.  Or just a
> plain old great high Henry, high voltage coil for lots of potential (ha)
uses.
>
>
> Regards,
>
> Al Erpel
>
> 18901, PA, USA
>
>
>
>
>