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Re: Van der Pol
Original poster: Mddeming@xxxxxxx
I don't have a schematic at hand right now, but as I remember it was
a coil-less oscillator that operated because at a certain ratio of
voltages between the grids the tube goes into a "negative resistance"
region where increasing current causes decreasing voltage, then at a
certain point switches back to positive slope causing oscillation. I
think there was also a circuit in my dad's "Fundamentals of Radio",
(Jordan et al c.1942) and there was a Federal Telephone & Radio
reference book from the same era that had a schematic but no
explaining text, IIRC.
In a message dated 12/14/05 7:46:57 P.M. Eastern Standard Time,
Tesla list wrote:
>Original poster: Mddeming@xxxxxxx
> Is anyone left who is:
>1) Old enough to remember the Tetrode-based Van der Pol Oscillator
>2) Young enough to remember what they knew ;-))
>3) Knows if it has any application to a VTTC?
I'm old enough and I'm certainly aware of who van der Pol was,
but never heard of this particular circuit. Do you have a schematic
or a reference to where one can be found? I can't imagine it has
much to offer compared to a simple triode oscillator.