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Andy's thread- Don Smith Device
#41
(04-18-2024, 03:08 AM)lfarrand Wrote: It will work, but the switches you are using in Falstad are 'ideal' switches with instant on and off time and no resistance etc, so the simulation result will not be the same as what you might achieve in the real world.

Thanks for the clarification, I'll keep that in mind
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#42
As I read again and again this paper Super-Regenerative Receivers
I think that it exactly describes what the principle of many of Don Smith's devices is.

Especially this chart and it's description about two frequencies in that paper
   

How can I achieve this?
1. Somehow create LC oscillating circuit with RF oscillations (frequency #1)
2. Apply rectangular waveform (frequency #2)
  - or apply rectified AC oscillation which (when very fast) creates rectangular wave?
  - or apply pulses in the same frequency as #1, but with pauses (eg. 50 pulses and then pause for another 50 pulses)
 
 
Now I "only" need to find out how to correctly fit this principle on Don's device....
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#43
Don Smith's Spark Gap

I found interesting information. Don Smith says about spark gaps this:

"Spark gaps and lightening arrestors, spark plugs included when I use them are not used as a or frequency or device timing. I use them for spike, overload and lightning protection. I use high quality capacitors, resistors and inductors."

Citation taken from here: https://energyevo.org/2015/01/18/updated...hoo-group/
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#44
DSE by Lorrie Matchett ?

Can this be one example of Don Smith Effect ? Where the brass rod and coiled wire around it act as DSE capacitor?
And correct diode output?

   

( found on https://www.youtube.com/watch?v=Kdup42Epq0o )

Of course, Don Smith used much larger voltage and much larger frequency. 
Maybe worth to try. But instead of mains to use ZVS (or flyback transformer) with HV and HF and real ground connections

Also some info in PJK book in Chapter 3 (page 266) https://ia600504.us.archive.org/32/items...JKbook.pdf
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#45
Spark gap with current in one direction only?

   
(from https://weareinfiniteenergy.wordpress.co...gap-diode/)


Is this the same as in this video when sparking one capacitor plate?




Here is what AI tells when you ask about spark gap diode:

A spark gap diode, also known as a unidirectional spark gap or triggered spark gap, is a device designed to allow current to flow in only one direction, similar to a semiconductor diode, but using a spark gap mechanism. Here is how you can configure a spark gap to achieve this unidirectional behavior:
Configuration for a Spark Gap Diode
  1. Asymmetric Electrode Design:
    • Use electrodes of different shapes or materials. One common design uses a pointed electrode (cathode) and a rounded or flat electrode (anode). The electric field is more concentrated at the pointed electrode, which facilitates the initiation of the spark primarily in one direction. (my note: this is oposite as described on image above)
  2. Polarization:
    • Polarize the electrodes such that the pointed electrode is always the cathode (negative) and the flat/rounded electrode is the anode (positive). This creates a condition where the spark gap breaks down more easily when the pointed electrode is negative.
  3. Gas Type and Pressure:
    • The type of gas and its pressure within the spark gap chamber can influence the breakdown voltage. Certain gases or pressures might facilitate a directional breakdown. Common gases used include air, nitrogen, or even specific gas mixtures designed to enhance unidirectional behavior.
  4. External Magnetic Field:
    • An external magnetic field can be applied to influence the direction of electron and ion motion, further promoting unidirectional current flow.

I think for me is usable only #1 of this list.


And little bit more from AI:

Electrode Configuration:
  • Cathode (Negative Electrode): Use a material with a high electron affinity and low work function to facilitate electron emission. Materials like tungsten or nickel are good choices.
  • Anode (Positive Electrode): Use a material that can withstand high temperatures and oxidation, such as copper or platinum.

Gas Selection: Although air is commonly used, other gases such as argon, neon, or nitrogen can be used depending on the desired characteristics of the spark gap diode. These gases have different ionization potentials and can affect the performance and stability of the spark.

Directional Control: To ensure the current flows in only one direction, you can incorporate a magnetic field perpendicular to the current flow. This field can influence the path of the electrons and ions, enhancing the unidirectional flow of current. Alternatively, use geometric configurations or additional auxiliary electrodes to guide the ionized path directionally.

Triggering Mechanism: In some designs, a triggering electrode can be used to initiate the spark at a lower voltage. This electrode is typically placed near the gap and connected to a control circuit that applies a small pulse to start the ionization process.


Example configuration:
Electrodes:
  • Cathode: Tungsten rod, 2 mm diameter.
  • Anode: Copper plate, 5 mm thick
Magnetic Field:
  • Place a small permanent magnet or an electromagnet perpendicular to the gap to influence the direction of the ionized particles.
Triggering:
  • Use a small auxiliary electrode near the gap connected to a pulse generator.

The magnetic field or geometric configuration ensures that the current flow is unidirectional, functioning like a conventional diode but using plasma dynamics instead of semiconductor junctions.

   

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#46
Don Smith 30kW Unit


   


Circuit diagram:

   

But Smith never shows full correct module - something is missing or something is unnecessary.
So we can assume, that the above circuit diagram is only one module and not fully correct wiring.

So how is real functional circuit diagram? Maybe like this:

   

The capacitor is the DSE (Don Smith Effect) capacitor - you put positive charge on one plate and on the other plate charge is replicated (negative charge is sucked from earth grounding). By this principle the capacitor is charged to much higher voltage then source. Then it is discharged through the load.


In falstad simulator:
https://tinyurl.com/2ckw493k


Automatic version in simulator:

   

https://tinyurl.com/2b8xwx4d
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#47
Hi Andy. I have read your thread here and have been on a similar path myself recently.
If you read this book (https://archive.org/details/7749501-the-...6/mode/1up ) (or skip to page 17) you will see a familiar circuit. Don Smith probably read this book!
Unfortunately it cannot be modelled in falstad, I don't think. Maybe in LT spice.
Good thing is it looks simple enough to build. Running something like this at low power with a signal generator would be an interesting experiment that I would like to try some time. I have tried it with HV cap discharge a few years ago bit didn't know what I was doing at the time so it was a wild stab in the dark that missed, like most of my attempts at OU.
Kind Regards, Sandy
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#48
Hi Sandy, 

good to see someone with the same pathway. I am in process of learning and experimenting.
Thank you for the link to the book, it is new to me.

Andy
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#49
Hello guys, have you heard of Rick Friedrich, he has some books and some resonance kits for learning by experimenting on how resonance coupling works. It is probably safer to start with a low powered device. For example I managed to make two coils on a PVC pipe, the coils having about 190uH, and with some 100 pF capacitor in parallel, it is possible to get these coils to resonate at around 1.06 MHz. And with 5V input from a signal generator it is possible to get 7 V on the first coil, and 14 V on the second coil. Not sure about power. But I think that is a great and safe start.

Don Smith references more books, one of which is the ARRL handbook, a 1400 pages summary of everything related to radio. Plenty of good information there too, no need to read everything.
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#50
(08-08-2024, 04:19 PM)kloakez Wrote: Hello guys, have you heard of Rick Friedrich, he has some books and some resonance kits for learning by experimenting on how resonance coupling works. It is probably safer to start with a low powered device. For example I managed to make two coils on a PVC pipe, the coils having about 190uH, and with some 100 pF capacitor in parallel, it is possible to get these coils to resonate at around 1.06 MHz. And with 5V input from a signal generator it is possible to get 7 V on the first coil, and 14 V on the second coil. Not sure about power. But I think that is a great and safe start.

Don Smith references more books, one of which is the ARRL handbook, a 1400 pages summary of everything related to radio. Plenty of good information there too, no need to read everything.

Thanks for the suggestion. I have seen some of Rick's writings. What I am going for now is Don Smith Effect with capacitor. 
But you are right that resonance is one thing which Don Smith mentioned very often.
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