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Re: [ATM] analog computers
Hi Anthony,
It sounded, to me, like a ramping motor. I poked around and came up with
http://www.process-controls.com/Cyronix1/load_devices_9.htm
That particular controller does something called phase angle firing, which sounds close
to what you want to do... some interesting links...
http://www.eurotherm.co.uk/uk/eng/Knowledge/PowerControl/PhaseAngleFiring.htm
and the math and circuit theory behind it...
http://www.tech.purdue.edu/Eet/courses/eet257/Lecture%20Notes/31-Phase_Angle_Fired_Power%20_Control.pdf
...surface for air one of these days; it would be good to see you.
RO
Anthony Stillman wrote:
> It doesn't matter voltage or current in and out. It's ultimately to drive
> a motor slower and slower or faster and faster. Accuracy, five percent,
> one percent, really, what ever I can get if it's elegant. A sin wave
> divided by it's phase shifted self would do. A very slow sine wave, uhm
> 24*60*sixty.. one over.., eleven and a half micro hertz, and frequency
> stability is important. The technology I knew would have required hundreds
> of components, hours of tinkering, and room at the dump. I was hoping for
> something either insanely simple or modern analog technology. A digital
> solution, yea sure, a snap, resistors and a ROM. But digital is well, it's
> just so, well, vulgar.
>
> Would that an exponential could be well matched to some portion of the
> tangent. Then a motor shorted across a supercap might have worked.
>
> Anthony
>
> horreum ianua
> barn door
>
>
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