Otto`s replication of Steven Mark`s TPU

[Hoppy]

Nicely prepared document Otto / Roberto.

From your document it would appear then that you are heating your Mosfets by design in gating them at 6V rather than 11V plus so that you can heat up the aluminium heatsink; I presume you lose the whole effect if 12V VDS is used?

You mention that the current draw from the PSU reduces as the 'effect' magnifies. When a Mosfet starts to runaway thermally, it's RDS increases. This will reduce the current from the PSU. With a good heatsink the temperature differential will be marked between the heatsink and the Mosfet. The mosfet will be cooler than the heatsink. I understand from your report that you have seen both of these effects.

[MeggerMan]

Hi Otto and Roberto,
When the power on the PSU went down to nearly zero, was the bulb still lit?

I think what I need to do now is get 2 more DDS 20 kits and build them into equipment cases and start testing.
You can buy a dds function generator from GW Instek but they are quite expensive even for just one.
One thing I want to try is different pulse widths and different input voltages.
Varying the duty cycle may allow different effects to take place.

The cost of building all 3 generators from scratch into one case using 3 x AD9833 will be about 80 USD.
Thats 3 x AD9833 (DDS), 3 x AD8611 (comparator for duty cycle), 3 x TPS2829 (2A MOSFET driver), 3 x FDP3651U (80A 100v fast mosfet - new), 1 x PIC16F873A (28 pin flash based microcontroller), 1 x 4x20 LCD display, 3 x rotary encoders,20MHz crystal,25Mhz crystal oscillator, case, pcb, push-buttons,resistors,caps,BNC bulkhead sockets,12V PSU.
And probably a few other bits I missed.
For now though I am going for the DDS 20 kits and just chuck them all in 3 cases.

Regards

Rob

[ronotte]

Hi Rob,

- in the case of Otto's runaway event ......there were not any loadt at all!!!!! that was his big mistake...pleas read pdf carefully.

- of course he was seeing a full pure sinewave on his still good scope...than BANG.

@Hoppy

read careful the pdf: the Mosfet gets +12VDC (of course trough the CC), the mosfet's driver only are set to +6 VDC as per IRF datasheet

Roberto & Otto

[turbo]

I Have been studying the document several times.
It's a nice documentation about test results however i did not read anything about:

* The gyroscopic effect.
* The Vibration /washboard effect.
* The up side down effect.
* The supposed Interaction with the magnetic field of the earth.
* The inertia effect/ turbine effect, especially the winding down part of it.

i did read something about the turbine effect,but not the slowly speeding up and down compass needle.

Can anybody give out additional information on the above effect's ?

Marco.

[ronotte]

Hi Rob...

Iforgot to say that I do like your design proposal. I want to help in this so let's discuss about it, not for the digital synthesizer itself, but rather for his output driver circuitry....I'm not sure you fully understood the needings. Again please make use of IRF840 ONLY as power MOSFET. Soon I will post if IRFP450 or 460 are compatible for this kind of application. I'm going also to send Otto 3 of them. Please remember that MOSFET seems to need only for:
- start the Seed creation process and
- in the beginning to deliver some heat to ease the Al particles release.

Regards
Roberto