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

[James Mora <wavetuner@xxxxxxxxx>]

Hi Scott,

The Internet is your friend. I wish it was around when I was younger! Here's
a first hit on Biasing a Mosfet. A good comparison between transistor
biasing and MOSFETS with some family curves. Use the Internet; it rocks for
lifetime learning!

http://people.seas.harvard.edu/~jones/es154/lectures/lecture_4/mosfet/mos_circuits/mos_circuits.html

Best Regards,
Jim Mora

On Sun, Feb 22, 2009 at 5:58 PM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:

> 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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