Giantkiller moves forward into Full Heterodyning.

[Roaster35]

While I agree that transducer positioning offered by me may not be optimal, I do think that even such positioning will push the wave around the ring. One may use vertical ring or square-profile ring for better results.

I do not agree with your using of term 'ultra-sound'. Proposed frequency lies in the audible range, and that guarantees that no considerable attenuation will be taking place (it's too low to be attenuated considerably, especially in a non-viscous substance). It is also important to note that iron couples to air badly and that means energy transmission from iron to air will be minimal (tuning fork is ringing for long even being coupled to a wooden resonator).

And of course I was talking about "inside" ringing and longitudal waves mainly: there is little sense in having energy go outside the ring.

You are quite right. I didn?t read the frequency correctly, it is right in the audible range.
However the longitudinal wave will not be pushed (directly) around the ring it will bounce between the face the transducer is attached to and the backwall of the ring which is perpendicular to the sound beam. As the beam is conical it will bounce around the ring between the 2 parallel faces. Think ring shaped room and bouncing a ball from floor to ceiling.
And yes there is less attenuation with lower frequencies. Typically the probes I use are 4 ? 5MHz. But for some applications as low as 1MHz usually for coarser grained materials like cast iron.

I do understand that for the sound (or ultrasound) to be introduced into any suitable material a couplant is needed. Be that a gel, oil, water or glue or other.

Just so you know where I am coming from ? I spend a few hundred hours a year with an ultrasound probe in my hand.

Still not sure how any of this would apply to a TPU type device.

Kindest regards

R

[bhaas]

What you have there is what alot of other people have done.
I don't wind back and forth. Wind in one direction then 1 loop back and wind again. And yes you have a coiled mess there. Think about the pulses go only 1 way. Check out Tesla ionizer circut 568177 and the 382282 patent. In fact, read all of his patents. That is cheaper than buying equipment.
If you can't dig deep with your mind, then you're just making doorbell circuits. And that is a waste of time.

You could clip the loop at the end, tie the pairs together and get 2 coils. But they still go back and forth. Slow down. All the stupid stuff has been done already.

--giantkiller.

That coil I made was a joke. After reading Patent 382282 I have a much better
picture of what's going on. But I had to start somewhere till the light bulb in my head
comes on. So wrapping diametrically-opposite coils on an iron core of insulated
iron wire like you had done earlier is my next plan. Thanks.

[aleks]

Still not sure how any of this would apply to a TPU type device.

I have offered a clue: an unconnected wire the moment it splits apart produces EM impulse. So, at first you produce a very strong standing wave in iron (that may almost cut it in half), then remove this standing wave (by stopping acoustical stimulation for a moment): the iron is likely to behave like being splitted and rejoined. Of course, you have to "lock" into a resonant frequency or there will be nothing fancy at all happening. That's my idea at least. It was said many times that TPU audibly buzzes and the buzz can be felt. While all transformers have alike buzzing performance, we are still left with an option that buzzing may be produced purposely by mechanical means - not as induction's side product.

[giantkiller]

That coil I made was a joke. After reading Patent 382282 I have a much better
picture of what's going on. But I had to start somewhere till the light bulb in my head
comes on. So wrapping diametrically-opposite coils on an iron core of insulated
iron wire like you had done earlier is my next plan. Thanks.

You will see a pattern of winding ratio if you look at the coils that work or produce high energy.
If you use steel, air, copper core then the windings have to overlap.
If you iron, and or airgap then coils sit side by side and not the windings on the same core. The magnet effort will show up on the secondary. The winding ratio is up to you. With or without respect to resonance. But resonance works the best.
Simple transformer stuff. This is what I've seen.

I swapped out my 555s for xr2206. I need to add a buffer stage to drive the irf840. More coming in the mail.
I put together a quad coil GKe2legoPMH with no air gap, all coils are 1:1. The starting ramp up signature is still in the waveform. This represents the most basic of setup even thought the configuration looks complex. I am going to put in air gaps next.
I also am going to hook the coils to see-saw the winding ratios. 1:4 or 4:1 Clip-on, clip-off!

--giantkiller. This like playing with kid toys.

[giantkiller]

I have offered a clue: an unconnected wire the moment it splits apart produces EM impulse. So, at first you produce a very strong standing wave in iron (that may almost cut it in half), then remove this standing wave (by stopping acoustical stimulation for a moment): the iron is likely to behave like being splitted and rejoined. Of course, you have to "lock" into a resonant frequency or there will be nothing fancy at all happening. That's my idea at least. It was said many times that TPU audibly buzzes and the buzz can be felt. While all transformers have alike buzzing performance, we are still left with an option that buzzing may be produced purposely by mechanical means - not as induction's side product.

Does the standing wave enjoy being moved? How does it reacte? I have not seen this talked about. It if it hits solid matter does it react or perform like a mini tidal wave? Think about that.

--giantkiller.