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Re: [TCML] I should have taken more electrical classes/MOSFET TC



MOSFETs work fine if you use the right ones.  Pushing the ratings as almost
everyone does will certainly destroy them.

Dr. Resonance




On Mon, Feb 23, 2009 at 12:22 PM, Weinhold Shannon L <
Shannon.L.Weinhold@xxxxxxxxxxxxxxx> wrote:

> Brother, I am in the same boat. Mosfets have proven to be an expensive
> waste of time. Good smoke bombs, that's what they are.
> Everybody says "yeah, you should use the power hexfets" and I'm like,
> "um, no thanks!"
> I have much better luck with power transistors. Give me a 250 watt
> resistor and a big heatsink and I can build something that works
> reliably. (and doubles as a backup heater in the winter time)
>
> To my ever reliable NTE29, I love thee.
> You were built for the undereducated mad scientist like me who refuses
> to take the time to understand things like VCE and ICEO.
> May you live long and continue absorbing the exhorberant amounts of
> current that I bestow on you forevermore.
>
> Good luck Scott.
> If you figure it out, let me know.
> :)
>
> Shannon Weinhold
> Klasdja Intelligent Innovations
>
> -----Original Message-----
> From: Scott Bogard [mailto:sdbogard@xxxxxxxxx]
> Sent: Sunday, February 22, 2009 5:58 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] I should have taken more electrical classes/MOSFET TC
>
> Greetings all,
>     All right, I been doing a bit of reading and I need something
> cleared up in plain English.  A MOSFET is just like a vacuum tube
> triode, (minus the obvious things like a plate transformer and a
> vacuum) except a triode turns off with voltage, and a MOSFET turns on
> with voltage, is this correct?  A BJT turns on with current, and voltage
> has little to do with it, what turns on an IGBT?  Anyway concerning the
> MOSFETs and tubes, if the above assumption is correct, why are there not
> designs for MOSFET based coils that are similar to the Armstrong
> oscillator tube coils (for those who are looking for little arcs at very
> little cost (MOSFETs are cheap, tubes are pricey and require external
> circuitry.))  If I am understanding this correctly it should be
> relatively easy to design such a circuit as you should essentially just
> reverse the direction of the windings, and maybe hook it to the positive
> rail instead of the ground?  (Well relatively simple for those who have
> actually used MOSFETs without exploding them or burning them, MOSFETs
> and me do not get along, I don't know why, I never did anything to them
> (except blow them up, but that wasn't my fault was it?))  Anyway just
> looking for answers, perhaps I am totally misunderstanding how to use
> them properly, and an electronics course might have helped with that.
> Thanks for your patience!
>
> Scott Bogard.
>
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>
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