Complete information on working SM style device.

[vince]

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

[buzz-ard]

@vince - May I suggest a Hall-effect sensor, like on car engines? You could use an identical driver circuit, and it would likely give better performance at higher speeds than an optical device might.

[juice]

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.

[Grumpy]

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.

How do you figure that voltage is a derived unit dependent on length?  Length of what?

If the voltage had anything to do with the length of the wire or the dimensions of the coil - he would have said so.

I think the he was "vague" in the requriements to keep this out of the hands of people who lack the necessary skills to utilize this technology.  If you are hung-up over the length of the damn wire or the size of the coils then you should let this go - it is not for you.

[duff]

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.



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