Proof of concept - perturbing a static magnetic field

[Bruce_TPU]

@ Chris
@ Brnbrade

Since the rest of Chris' drawing is correct, I would notice the sound frequency, which is a Long wave I do believe, also going in opposing direction, at the same time, in the same wire, as WaveWatcher shared not long ago.  And then induction into the secondary.  Others can explain it FAR better than I!    

I see working TPU's in our futures.

Brnbrade you have been a good student of Erfinder!  Otto recieved many clues from him as well!  You can be proud of what you have discovered!  We now need to confirm this.  This is of the utmost importance. 

Fine Wire?  About what mm?
Medium wire?  About What mm?
What size PVC pipe?  1/2 inch   3/4 inch  or 1 inch or larger?

Thank you!

[BEP]

Already covered while I was typing.

[bob.rennips]

brnbrade  :

I don't have a good drawing tool. Is it like this? What is the FM frequency?

chrisC

chrisC

Excellent work.

On your ring magnet where are the North - South.

Are they:

1. North Top, South on Bottom. (vertical field)
2. South Top, North on Bottom. (vertical field)
3. South on inside radius, North on outside radius (radial field)
4. North on inside radius, south on outside radius (radial field)

EDIT: Now have it confirmed that brnbrade used a ring magnet was from an old loudspeaker. This means the poles are on the flat face - which is 1 or 2 above.

Thanks, Bob

[bob.rennips]

Having duplicated Otto&Jason's driver/mosfet combination I've now got a much better setup. The main difference other that using a low side driver and not the high side driver, is the addition of two decoupling capacitors directly across the power inputs to the driver. This removed much of the rubbish and I was getting much crisper square waves when entering high khz 500K+.

I've also noticed that when applying a larger 24V across the coil to generate the static magnetic field, that the ability of one coil to induce into another coil is cut in half, REGARDLESS of the direction of current applied to generate the static magnetic field. In other words it doesn't matter whether N is top of the coil or bottom of the coil, they both have the effect of reducing the coupling between the two inducing bifilar coils.

I expected this to happen in one direction, but thought that in the other direction there would be an enhancement.

Bob,

If you are using a ferromagnetic core, perhaps it was being saturated with the static field applied, and not without it. This would explain the reduced coupling.

Darren

Air core only.

[Earl]

Hi brnbrade,

Is this how your setup looked like?
Please confirm or post necessary changes.

73, Earl

brnbrade posted image