HIGH QUALITY TPU DVD Video Released from Jack Durban

[Grumpy]

@ Grumpy

5kHz is probably just a mechanical resonance from SM's wonderful hand-wound, unpotted coils.   This is undesirable in speaker coils.

well I assumed that  all along, that it was some resonance due to the dimension, but then recently, I got the impression all the different TPUs, of varing diameters, all functioned at 5 to 6 KHz.    And he seems to reiterate that they extract energy from the "earth magnetic field, which has an INHERENT frequency"   It's a definite frequency, and "you tune to it" like he says.    So, is this INHERENT FREQUENCY = 5 KHz  ?

So, haveing said that, this is not in opposition to having the device resonant.  In fact, it needs to be resonant at the same frequency for it to work effectively.  After all we tune antennas to be resonant at the desired frequency.

If we are to embark on the TPU as a Receiver, theory,  then the TPU is some sort of loop antenna that taps into a naturally occuring frequency.

If SM pulsed the rings at this rate, 5 to 6 kHz, would this account for the physical vibration and audible sound?

He states at the end of one of the videos that the energy comes from "within" the device.

[Localjoe]

@slapper

Google MUSIC OF THE SPHERES, then pythagoras  you'l be pleasently suprised.
                                                                                      Joe
                                                                               

[wattsup]

@Alex

Thanks for the correction but the initial idea stands in that at 3600 rpm you have 60hz (60x60). At 5000hz you would require an rpm of 60 x 5000 or 300,000 rpm. Now why would you want to create that much rpm when it is a know fact that you can get away with 3600. What I think is happening is SM mixes up rpm and hz when he talks about the devices. There is nothing in these devices that can justify such high frequencies.  It's just another diversion.

Like I said, I am producing with a regular relay pulsing up to 1400 volts. The FTPU was producing only 61 volts on the meter, and not on a load. So why would you need 300,000 pulse per minute just to produce 61 volts. It does not make any sense at all.

[mikestocks2006]

here's a site with good info about them, and who makes them

btw, why are you interested in depletion-mode? they are much less common.

...because they more closely operate like tubes maybe?

http://www.automotivedesignline.com/showArticle.jhtml?articleID=191900470

Thanks for the reference, I have looked at that site and a number of others before, they do describe what the DEMOS is (depletion mode mosfet) but they do not have them for sale.

Why the interest in depletion mode?
Trying to keep it simple, and allow the system to self tune, find it?s own resonant frequency by default. Then build on that. Remember the old DC bicycle bells? A set of AA or C batteries and simple coil and a leaf spring. The spring by it?s own movement interrupts the circuit, and moves back at its own natural frequency. (function of stiffness, weight etc)

I?m interested in the off part of the cycle. First having a current and then stop the flow abruptly, it would also be in line with RE behavior, kicks, etc.
So first I looked into NON SS solution such as normally closed reed switches. Place them in line with the coil, and as the coil gets magnetized the switch opens, stops the current flow, the magnetic field collapses and the cycle repeats at the frequency of the coil's magnetic field collapse and so on.

However; there are a couple of  issues with reed switches.
, They have difficulty handling inductive loads, even though they are nice little spark gap devices (normally on mode)
. Most have a self resonant frequency of 2-3 Khz and that way bellow the 5kHz mentions for the TPU. But few more difficult to source models may go higher above the 5Khz range
.Finally their cycle life is few million cycles, so the tpu would not run more than about 20 mins or so at 5khz. Go to Mhz and assuming it can switch that fast, it wouldn?t last more than few seconds.

So the next step is to look at something that would handle fast off-switching, with long cycle life, and higher frequencies just in case it needs to go up to the Mhz range.

And that led to the DpletionMode MOSFET. Were a voltage on the gate actually switches the current off and at nanosecond scale times. The signal to the gate can come directly from the control coil as it get energized and so on., or better yet from the collector so the loop is closed fully and the system automatically finds its own resonant frequency, whatever that might be, with a simple, inexpensive set up.

[wattsup]

@mikestocks2006

You are right up the alley in good orientation of thought.

About the reed, even at 2-3khz, if you increased the inductive load with some chokes, would it be the same. Also to get the right action, one would need to test many reed values since they come in so many activation ranges. I am also looking for a three way reed. I have found some in home alarm windows or door magnetic switches. They come in 2 or 3 way. I have four of these in 3-way and was going to do some experimentation but the video had taken all my time. lol

Good to see someone else is doing it.