Re: [TCML] flyback primary wireing

["DC Cox" <resonance@xxxxxxxxxxxx>]

I'm now using a MOSFET circuit with a ST Micro STW19NM65N MOSFET --- 650
Volt 15.5 Amp and only 0.25 Ohm resistance.
Running a 555 timer with a dual transistor buffer (2N2222A and 2N3905) it
produces a nice output without overdriving.  Around 3.5 Amps current draw at
16 VDC.

btw, best to use analog meters when working with any HV or systems that may
contain kickback spikes!

Dr. Resonance



On Sat, Aug 16, 2008 at 10:01 PM, Scott Bogard <teslas-intern@xxxxxxxxxxx>wrote:

>
> Another curious thing I have noticed (using it to drive a plasma globe) is
> that the output drops slightly when I touch the globe.  I am using a TIP3055
> (not an NPN 3055,) it doesn't seem to get too hot, and I don't know what the
> current is because it scrambles my digital multimeter!  Perhaps more primary
> turns will fix that (or a different transistor.)  Thanks guys for your
> responses.
>
> Scott Bogard
>
> > Date: Sat, 16 Aug 2008 12:49:53 +0000
> > From: steven219@xxxxxxxxxxxxxx
> > Subject: Re: [TCML] flyback primary wireing
> > To: tesla@xxxxxxxxxx
> > CC:
> >
> > Hope its not off topic 'cos I've been playing with flybacks for years to
> power small Tesla coils. Actually the number of turns doesn't matter too
> much, whatever works best for you is the answer. Mostly it depends on the
> particular flyback you have. 2-5 turns is about right, 2 turns will give you
> the higher output voltage, but it could be too much for some flybacks.
> >
> >
> >
> > ----- Original Message ----
> > From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Sent: Saturday, 16 August, 2008 5:01:49 AM
> > Subject: [TCML] flyback primary wireing
> >
> >
> > Hey all,
> >     A quick and quasi off-topic question, how does one determine the
> > best number of primary (and feedback) turns to use on a simple single
> > transistor flyback driver (like this one
> > http://bogard.110mb.com/Plasmaglobe.htm
> > ?)  I seem to be getting the most power using the original 2 turn
> > primary, but most sources say 5 or more turns is best.  Is it simply a
> > matter of desired impedance or is there more to it (like the transistors
> > internal resistance, or the ratio of the two other resistors.)  Thanks,
> > feel free to respond off list, as this is quasi-off topic.
> >
> > Scott Bogard.
> >
> >
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