Phase Locked Loop

[angryScientist]

To really close the loop you need to lock it in phase.

In the 1940s, the first widespread use of the phase-locked loop was in the synchronization of the horizontal and vertical sweep oscillators in television receivers to the transmitted sync pulses. Such circuits carried the names "Synchro-Lock" and "Synchro-Guide."

http://www.uoguelph.ca/~antoon/gadgets/pll/pll.html

Last night I was working on another project with some friends of mine having to do with water. Looking at some schematics that my buddy had I was a bit confused because none of the functional block were labeled or gave any indication of there function.

In trying to get a more stable frequency generator for our project I started digging into phase locked loop technology because it has very good frequency stability, one of the best. That is when I recognized the functional blocks of a pll. It was used as a resonant frequency tracker to lock on to a varying resonance.

It finally dawned on me that the feed back could be used as the measuring stick of a ring and the oscillator could be tuned spot on to that harmonic. Or if preferred, the PLL could be made to tune to the side of the frequency.

I'm wondering if S. Mark made many suggestions toward the use of a simple Phase-Locked Loop as the circuit controller.

http://schematics.blogspot.com/2005/01/pll-using-4046.html

I did a search of the forum but I did not find one reference referring to phase-locked loops.

[giantkiller]

The PLL could be made to tune to the side of the frequency.

Nuff said, amigo.

--giantkiller.

[BEP]

Not even that complicated a blocking oscillator syncs to external signals and can be made to lead or lag 

During wind-up it can push or aid and near the critical point it can switch to hold-back.

[angryScientist]

I was surprised to see the similarities of this circuit to what is needed.


http://www.rexresearch.com/meyerhy/wo92.htm

I think that Stanley Meyer might have discovered the secret of a toroidal power unit.

If you set up a standing wave in a toroidal core then you have something that is akin to a Tesla coil. Except it is quite a bit simpler when you don't have to worry about the matching the electrical resonance (ie. capacitance and inductance) to the physical resonance (ie. physical length of the wire).All you need to match is the physical resonance.

By using a feed back coil it will give you the right frequency you need to match that core without having to guess.

[angryScientist]

This is the chip that I am going to start out on. I just happen to have one that I picked up from Radio Shack. They seem to be very common and easy to obtain. Also there is a lot of documentation and examples of how to use this chip on the internet.

74HCT4046A Datasheet
http://www.alldatasheet.com/datasheet-pdf/pdf/184467/TI/CD74HCT4046A.html



I was looking for a simple circuit using triode vacuum tubes that would act as a Phase-locked loop.

http://mysite.du.edu/~etuttle/electron/elect36.htm

It is possible to synchronize the oscillations with an external sine wave by applying the external sine wave at the grid of the left-hand triode, coupled through a capacitor. If you do this (not using the differentiating RC circuit), trigger the scope on the signal from the signal generator and observe both the synchronizing and output signals. The frequency can be varied over a considerable range around 2 kHz, and the multivibrator will be phase locked to the synchronizing signal. Synchronization can also be obtained at multiples of the multivibrator's natural frequency, as well as with a string of pulses instead of a sine wave. Note the phase relations as the frequency of the synchronizing signal is varied. It is like a phase-locked loop in effect, but the operation is quite different.

I will throw this is just for fun. I didn't go over this document with a fine toothed comb but maybe someone will find some goodies in it.

Three-Frequency Resonances in Coupled Phase-Locked Loops
http://lec.ugr.es/~julyan/papers/ieee.pdf