user TURBO?s replication of Steven Mark?s TPU ?

[giantkiller]

And of course, there is always room for team growth and expansion...

Happy New Year!

-giantkiller.

[starcruiser]

I tried wiring my first TPU (single collector and 18Ga control coils) using the Markovich design as a guide (control coils in series only with the feedback coil reversed) and the output provided was 6 times the input, no real power but it shows promise.

Hi Carl,

Do you mean it was all low power, but you measured 6 times the power out?  Or just 6 times the voltage, but 6 times less the current?  So no more power out?  Once you find the tiny excess output you can start feedback!


Regards,

Dave.

Dave,

To answer your question. It was 6 times the voltage (I stand corrected) but there was more power (albeit a small amount). Please note that the TPU I used  was using was a single layer configuration with a large collector in comparison to Otto's (15 turns of lamp cord, double strand). There is some power there like I said, I used a diode to rectify and it dropped the voltage down considerably.

This confirms to me that a few modifications are required in my TPU design, hence my earlier post and reference to Otto's design which validated my assumption of the different control wiring (smaller gauge, 24ga or 30ga). I also think the collector needs to be a single loop (like a loop antenna) which I think provides a voltage differential in the coils similar to the Markovich device.

The remaining questions to be answered as I see it are;

1. whether the winding direction of the outer feedback coil needs to be in opposition to the control coils and whether this will provide any additional gain.

2. does the wiring of the 4 segment control coils take care of #1 if they are wired like the Tesla generator coils.

3. Do we need to look at a 14 or 16ga feedback coil (to increase current, this is looking at a transformer effect that may be ocurring).

4. Are 3 frequencies really required or just one with their harmonics enough?


To elaborate on the experiement...

One of the experiements I performed yesterday used only one frequency of 520Khz (i varied it around a bit and got the output to increase and decrease a bit. Lower frequencies did not provide anything like the 500Khz area. The oscillator was putting out 5Vpp with no ground lead attached (I did try this with it attached and to my surprise it did not affect the output very much)

Then next when I mixed several using my 555 timers (using a 50% duty cycle) I got some intersting results but noted that a lower frequency in the 5Khz area did not really affect the output. The frequency mix was using frequencies above 100Khz. This seems to indicate the pulse width needs to be smaller than 10uSec (50Khz). I may try to add another 555 timer to adjust the pulse width on the lower frequencies and see if this provides any usefull effect.

With the 500Khz frequencies I did note the mostly positive going spikes. I want to construct the modified TPU I mentioned and redo the experiements to see what I get. Looking to get a spool of 30ga magnet wire now to wind a new TPU.

One thing that puzzles me though is Otto's comment regarding the MOSFets, he went to a different version and it improved his output. He commented on the capacitive effect in that particular unit. I am wondering if we add a capacitor of a similar value to the output of a oscillator using a standard output transistor would this provide the same effect?

Like I said more questions and testing to do.

[mflynn44]

Hello all,

the next days I will not post because I have no access to a PC.

I wish you all great people here and your families a

        HAPPY NEW YEAR

Otto

Happy New Year to you Otto!

[Grumpy]

Some notes on above:

Tesla used a capacitor across his coils to improve the output.

MOSFETs have different switching times as well as other factors.  I posted sevral documents on MOSFETs in the "PULSERS ONLY" section - speed-up techniques to improve switching times are included as are test circuits to determine switching times, etc.

MOSFETs are a little slow, but can switch a lot of juice.

You can switch several in a sequence, driven by transistors, to get a continuous train of signals.

[aether22]

About the MOSFET's, did Otto say that he was using transistors or MOSFET drivers to charge/discharge his gates?

Maybe it was just the mosfet with the lowest gate capacitance?