On Sun, 02 Feb 2014 14:14:19 -0500, Phil Hobbs
wrote:

On 2/2/2014 12:58 PM, John Larkin wrote:
On Sun, 02 Feb 2014 09:08:17 -0700, Jim Thompson
wrote:

On Sun, 02 Feb 2014 08:07:25 -0800, John Larkin
wrote:

On Sun, 02 Feb 2014 08:49:55 -0700, Jim Thompson
wrote:

PAL fails to realize that injection locking an oscillator requires an
oscillator :-}

You fail to realize that a parametric oscillator is an oscillator.




His post was an attempt to output a subharmonic without the
oscillator. There are better ways to handle such a scenario.

For example, see my boom-box machine (circa 1979)...


http://www.analog-innovations.com/SED/SubBassEnhancer_BoomBoxProcessor.pdf


BoomBox! Hilarious hairball. Why do something with a few parts, when you can use
hundreds?


Here is an injection-locked OSCILLATOR....


http://www.analog-innovations.com/SED/InjectionLockingAnOscillator.pdf

...Jim Thompson

Trivial and unoriginal. It's more interesting to use the parametric pump as the
gain element.

Of course, PAL, it works so-o-o-o well :-}

...Jim Thompson

The point is that it does work. It makes an f/2 signal using only a diode as the
active element, which was (some time ago) in question here. With a proper
varicap diode and some optimization, it would be more efficient. But it works.
It was sort of an homage to A. F. Boff.

http://www.hpl.hp.com/hpjournal/pdfs...Fs/1960-01.pdf



Parametric dividers are still for sale, I think. Somebody used to
advertise them as "frequency halvers".

It's a pretty well known effect--see e.g.
http://www.vk2zay.net/article/150

Cheers

Phil Hobbs

I was thinking about how to do a Spice sim that is an analog to the pendulum
pumped by the 60 Hz coil. The tricky part is coming up with a nonlinear resistor
(or whatever) that approximates the force that the coil applies to the pendulum
as a function of the pendulum's angular position. That curve will need to be
fairly spikey to get decent pumping action.

Some other day. I've got to fix our hairdresser's 12-volt track lighting system
(the fried parts of which are in the kitchen of the Chinese restaurant next
door) and I think something else is going on this afternoon maybe.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation