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2020-01-20, 10:24:40
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Author Topic: Itsu's workbench / placeholder.  (Read 11230 times)

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I went back working on the nanopulser to be used in the 45.5Mhz iron toroid NMR project.

This is what i have at the moment, which was build according to the diagram from the pdf.
For D2 i use the same kind of TVS as for D8.

The screenshot shows the generated nano-pulse with this setup.

Video here: https://www.youtube.com/watch?v=FoFybhLc9SE

Itsu
   
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Posts: 142
I went back working on the nanopulser to be used in the 45.5Mhz iron toroid NMR project.

This is what i have at the moment, which was build according to the diagram from the pdf.
For D2 i use the same kind of TVS as for D8.

The screenshot shows the generated nano-pulse with this setup.

Video here: https://www.youtube.com/watch?v=FoFybhLc9SE

Itsu

Good day Itsu
I watched the video, what is inside the small metal box that is connected the the Mosfet PCB?
I noticed that it has really long twisted pair wires connecting it to the other pcb.
Which parts heat up when you reach the frequency repetition limit of the nanopulser?
I can think of a few experiments to do with such a pulser, but would need high repetition rate.
take care, peace
lost_bro
   

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Hi Lost,


inside the small peppermunt box is the "100ns pulse @ 1hz" generator to drive the gate driver / MOSFET designed by verpies, see here:
https://www.overunityresearch.com/index.php?topic=3691.msg71997#msg71997

and a video of it a few posts later here:
https://www.overunityresearch.com/index.php?topic=3691.msg72211#msg72211


Above about 10Khz PRF (not tried it with this setup) the things that heat up fast are the MOSFET, the little toroid, the D2 diode, the DSR Diode,
the 50 Ohm termination resistor and the DSRD capacitors (C).

These last ones should be good quality as the ceramic disk ones used earier will heat up and lower in value, causing the pulse to drop quick.

I now use MLCC caps 2.2nF @ 4kv 3 parallel.

The design in the PDF claims 50Khz PRF and a 2.25kv pulse  :D


Itsu
   
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https://www.youtube.com/watch?v=WNeLUngb-Xg&list=P
Itsu, Void, just to say hello to a friends and many thanks to Gyula for invited me in!


---------------------------
   

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Posts: 1883

Hi WhatIsIt,

nice to have you here,  welcome.


Itsu
   
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Hello WhatItIt. Welcome!  :)

   

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OK, I have ordered some 74VHC04, so that will improve the signal further.
Did you ever receive it ?
   

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Posts: 1883

Yes, got some and put one in, working ok, since half a year or so.

Itsu
   
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