Re: Amplifone HV Trans question...

Tesla coils??? OK, let's go back to the idea of using auto ignition coils!

Tesla coils are basically a resonant circuit that put out something close to a
sinewave (not to mention one hell of a lot of radio interference). An ignition
coil, as normally used, is run in a flyback mode.

A resonant coil (Tesla) putting out a sinewave would require the high voltage
rectifier to withstand over double the desired output. So for 25 kV out you
would need in excess of a 50 kV rectifier (unless you build a multiplier and use
lower voltages). A flyback circuit applies power to the primary which causes a
relatively small output (at the wrong polarity) at the secondary to cause a
magnetic buildup in the core. When the primary is then disconnected the
collapsing field give you your output voltages. The coil (when the magnetic
field tries to reverse) WOULD then give the rectifier a very high reverse
voltage if it weren't for the damper turning on at this point.

A Tesla coil is usually a pretty loosely coupled transformer, which isn't good
for hardly any current.

John Robertson wrote:

> Has anyone looked at Tesla coils as a possible source of HV? Seems to me
> with all those plasma globes etc, floating around that they are certainly
> in the voltage range we need, probably higher, but...adjustable? I don't
> think the current range is much different, and then the focus and screen
> can be tapped off, or generated separately.
>
> JOhn :-#)#
>
> At 07:18 AM 6/14/00, Jess Askey wrote:
> >Hi all,
> > I have disected my dead WinTron HV transformer just to see what the
> > hell is in there.
> >Well it is pretty straightforward. Looks like they use a capacitor/diode
> >multiplier in
> >there to get the anode voltage off the focus winding. I didn't think most
> >HV transformers
> >did this but I really don't know much about flyback type transformers.
> > Im talking to some manufacturing companies about getting this remade
> > (cheaper?).
> >Hopefully I can make more progress than the others that tried to get this
> >beast copied.
> >Anyway, I don't want to send the WinTron out to the manufacturers because
> >I fear I will
> >not get it back. So, Im documenting it all myself. Im about to unwind and
> >count all the
> >windings. Does anyone have any suggestions on how I can find out the wire
> >guages, I don't
> >have any references here and a few are extremely thin (~36 guage?)
> > Also, if anyone has any EM experience, Im trying to figure out the core
> > type. Is there
> >any way to find out the core type after the fact like this?
> >
> >thanks for any input...
> > jess
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>
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
> http://www.flippers.com
> "Old pinballers never die, they just flip out."
>
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