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Duff

It's a wooden dowel frame, no steel.

Also found that my magnetic switches definitely cannot switch after even low rotation speed.  Might try some type of optical device to sequence the coils

Vince

He didn't mention a wire length - so it was probably not that important.

But he did mention the voltage. Yet voltage is a derived unit, dependent on length. So if you don't have any physical size specified, voltage is irrelevant. We must be made to assume the device is of a certain overall size then, about the same size of a SM device. I still find it silly for spherics to suggest the voltage so specifically.

As for the NMR - isn't that like 32 MHz-ish?  Wouldn't this relate to the pulse width or repetition frequency?  Probably the width as we are impact exciting the coils.  So, pulses in the nanosecond range adjusted for best effect.

and no metal supporting structure...

@Grumpy

NMR is dependant on the magnetic field strength.

(http://img441.imageshack.us/img441/9911/freqlarmorvk0.png)

Fe⁵⁷ Gyromagnetic Ratio (rad T-1 s-1) :    0.8661 x 10⁷

When I plugged in the total magnetic field strength for my location I came up with:
(0.8661E7 / 2pi) * 49,848.5 nT = 68.713 Hz

Magnetic Field Calculator: http://www.ngdc.noaa.gov/geomag/magfield.shtml

Pulsing solenoids would change that somewhat but I would not think it would go into the MHz range, maybe not even KHz, depending on your coil construction.

So we pulse at some harmonic of the NMR frequency of Fe⁵⁷.
What does a harmonic have to do with NMR?
From what I've been able to determine the NMR frequency is not influenced by harmonics since it's a very narrow bandwidth. All protons don't respond to exactly the same frequency so there is a small variance.

So, do we buy a magnetic field strength meter and measure the field while pulsing the solenoid.
Then what harmonic and why???


@Vince

Sorry, my mistake.


-Duff

Yes, that seems reasonable.

The oscillator would need to be very stable with fine tuning but then we've always known that.

Yesterday I found a software package which will allow you to calculate the magnetic field strength/magnetic field lines of a solenoid. This should allow you to calculate the NMR frequency for your coil set and thus get you closer to where you need to be pulsing.

http://www.vizimag.com/

They have a 30 day Free Trial version which will run on Windows AND Linux which you can down load here: http://www.vizimag.com/vizimagtr316.zip

-Duff

A repost with links made visible.

Building on the rapid fire rat race controller, one could use a 74AHC164 with a 74VHC27 and 74AHC377 to generate same pulses as with the 4017 but with the nice symmetric delay properties of the 377. Unfortunately, 377 available as SMD only.
[Details: connect Q1..Q6 of the 164 to two NOR gates of the 27, and their output to the 2 data inputs of the 164. This creates a self-initializing shift register that rotates a 2-cycle pulse with a period of 9 cycles. Connect Q0/Q3/Q6 to the third 27 NOR and its output to E of the 377. Then connect Q1/Q4/Q7 to the data inputs of the 377. This yields the output signals for the first 3 coils. The 4th coil signal is connecting E of the 377 to one of its data inputs and the output again to an input, i.e. twice in sequence, to get the pulse delayed/shortened the same as the others. The 164 and the 377 use the same input clock signal.]

If one does use an embedded controller already, then it looks like an AD9510 clock divider is pretty good. It has 4 identical outputs (twice) that can be programmed to generate the signals for the 4 coils (one divide-by-3 with 33% duty cycle and three divide-by-9 with 11% duty cycle and 0/3/6 cycle phase shifts).

For a clock generator, the AD9912 DDS looks pretty nice, although somewhat expensive (some $70). However, it has some nice properties that make its use convenient: very high frequency output resolution and built-in comparator to generate square wave output. And the interesting part is, it is used by HAM amateur radio operators, so there are already people out there who have some experience with it. While it looks like overkill to have a device designed to generate high quality sine output to then just make it into a square wave signal, it allows very fine frequency adjustments that make it simple and flexible to use (see also AN-823 and AN-837).

Apparently it's better to use an external main clock source like the Epson Toyocom EG-2102CA PECL instead of the internal PLL of above devices. Below are some pictures taken by radio operator DL7IY from his article about the AD9912 in FA 3/08 (German magazine Funkamateur).

Is this related in anyway?     

http://www.koreus.com/video/telephone-portable-mais-popcorn.html

Shucks !!   I thought it was real   !!!