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R: [TCML] Speaking of Mosfets and oscillators - Push Pull
Bill's schematics is not properly a Royer, infact Royer design require a
capacitor connected directly between the two drain of the mosfets, but
in every case this oscillator is made to generate a frequency of some
MHz and used to produce the base discharge flame for plasma tweeters.
The IGBT Royer that you can see on HOT-STREAMER is capable to give 15"
sparks and work in resonant mode at a frequency of 125kHz. The secondary
is wound on 4" pvc drain pipe with 39awg magnet wire for a lenght of 12"
in order to have this frequency without toroid charge.
The plasma ball that you can see on the photos are two flask for neon
plant used to charge gaseous tube. The red one is neon, the blue one is
a mix of 80%argon and 20%neon, excited by a VTTC.
The members of italian mailing list, have played a lot with this
schematics, using from TV flyback core to air core and, if the layout is
correct, once choosen the right component, is pratically indestructible.
http://img410.imageshack.us/my.php?image=royerscope2.png
This is the vaweform of current and voltage across IGBT in Teslamode
http://img258.imageshack.us/my.php?image=royerp30vdc.jpg
This is a flame using a tv flyback at 30vdc IRFP250 mosfet without
heatsink 40kHz.
Cheers
Vladi
-----Messaggio originale-----
Da: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] Per conto
di Scott Bogard
Inviato: martedì 24 febbraio 2009 18.42
A: Tesla Coil Mailing List
Oggetto: Re: [TCML] Speaking of Mosfets and oscillators - Push Pull
If I find some time I'll try to put that circuit together, though I'd
like to point out that this guy did somehow get a Royer/Armstrong
oscillator to work with FETs in a TC application.
http://users.skynet.be/BillsPage/TeslaPage.html
I've tried this with flybacks and the MOSFETs burn or short, but I was
using much different resistor values and IRF640? fets. I think MOSFETs
are just prejudice against me, Oh well.
Scott Bogard.
On 2/24/09, Jim Mora <wavetuner@xxxxxxxxx> wrote:
> Hello Scott, Group,
>
> The issue of MOSFET and Armstrong oscillators recently came up. I took
> a look at various Hartley and Culpitts oscillators while I was at it.
> Then what I have been thinking about far off with my (4) 833a's came
> to mind and push/pull operation. Has anyone played around with this
> MOSFET configuration? How about it Scott- it is always a learning
> experience. You gotta have some smoke to make a fire;-)
>
> Jim Mora
>
> http://www.solderingpoint.com/projects/rfpp/pushpull.php
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
>
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