Building a Smith Generator (topic erroneously marked solved!)

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sampojoe posted this 12 January 2018

I am starting work on building a Smith Generator.  Thanks to your work here, I am getting the role of Bucking Coils on the circuit.  I found this link for starters, a pdf that purports to tell you how to build one:  

projectavalon.net/forum4/attachment.php?attachmentid=25399

I extracted another schematic and made it an attachment below.  What they do not mention anywhere in the document is that coil L2 most likely is a Bucking Coil, as you have most eloquently shown here!  I guess they do say it is a "Tesla Coil".  I guess that could be a Partnered Output Coil.  I have seen similar schematics on youtubes by kdkinen, where he shows his replication attempts seemingly at least generating OU.  His schematics I can clearly see the Partnered Output Coils.  So with this understanding I think I will attempt a replication.   It seems very simple.  You use a 30 ma NST to get thousands of volts.  The front of the the circuit as shown uses a small inverter driven by a 12v battery to get 120v AC, which is fed thru a variac to control the input voltage to the NST.  The final output is supposed to be up to 8000v @ ~20A DC, as the L1/L2 is 4:1 step-up!   Pretty astounding.

I am not going to use a battery to run an inverter to drive the system.  I will just initially plug my variac into the wall.  You do need a real sine wave input for this.

So the front of the circuit feeding L1 starting with the output of the NST is grounded at the center point tap of the NST.  The output of the NST is rectified to extract the starting HV and then reconverted to AC with a spark gap tuned with resistors and caps to the coil L1 for about 31.5 kHZ AC .

Here is a hand drawn schematic online and in the pdf : Hand Drawn Don Smith Schematic

I got a little excited about solving the performance issues of the L1 circuit and clicked the solved button thinking it just applied to the post by Marathonman showing how Tesla built such circuits. But no, it got applied to the entire trhead, and is apparently a big database issue to correct.  So please ignore the green solved check!

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Chris posted this 12 January 2018

Hi Sampojoe - This is awesome!

If I may, Don Smith made many videos, but very little actual news coverage, very little anywhere except for the videos.

However, the videos contain really good and very accurate information. Careful counting of the turns, there is a 1 to 4 ratio. This is a common theme in these devices.

My main and best snippet id:

 

The Coil Don marks as L2, is actually 2 Coils. I have fount it much easier to think of them this way.

 

 If one treats each Coil Separately, then one can also measure the Current in each Coil and ensure that the Currents are opposing. By Measuring the Currents, one can view direct improvements. But be careful, High Voltage and Current can damage equipment very quickly!

Don Smith was a big believer in the One Quarter Wavelength principle:

One Half Wavelength:

 

One Quarter Wavelength:

 

I also have seen the same importance, and its also been pointed out by many others before:

Resonance frequencies may be maintained quite constant at high power levels so long as the load remains constant. We are all familiar with AM and FM propagation, where in the case as AM, the voltage amplitude varies, and with FM, the frequency is modulated.


 However, the output power sees a constant load impedance, that of the matched antenna system. If this changes, the input to the antenna is mismatched, and standing waves are generated resulting in a loss of power.

Floyd "Sparky" Sweet - Magnetic Resonance

I have said it before, I am still learning, I will always be a student of Life, I do not have all the answers, but I have seen this importance before. When the right Resonance is achieved, the Coils Magnetic Fields Oppose, the Currents are 180 Degrees out of phase, and excess Power is the "Generated" by the Laws of Electromagnetic Induction. Another of my favorite Videos:

 

I know you have great knowledge in these areas, and much of what I have said is most likely obvious to you, but wanted to try to help.

Don Smith did write one of the pdf documents, I have a copy here: Don Smith

Thank You for your post, please keep us updated!

   Chris

 

sampojoe posted this 12 January 2018

I am starting to line up parts, figuring out the coil build...  If anyone knows anything about this comment would be appreciated.  

wow Chris, thanks, so much info so fast!  Yes I can't help thinking of the L2 as 2 separate coils also. After all I cannot see something being called one coil when it is wound clockwise for half of it and then reversed to counter-clockwise for the second half!

Regarding your first video snippet, I had watched that on youtube before somewhere, and I thought Don was being somewhat deceptive about it being "one coil with the center cut out".  That would imply both parts would be wound in the same direction, while the essential feature of bucking coils are 1/2 CW and the other wound CCW.  After all I think he would've wanted to protect some secrets so he has a chance of making some money and a living off it ;-)

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sampojoe posted this 12 January 2018

The L2 coil in the pdf is described as a Barker & Williamson Airdux Coil here.  But again that is indicating its a "one coil" thing.  I suppose they could make those coils CW and CCW, but it would have to be a special manufacture request possibly.  They make no distinction when ordering.  But I will try to build it myself I think.  I would like to use insulated wire as opposed to bare. I can't imagine it would change anything but make it safer.  The oscillation frequency on the L1 would be any high amount that you get by adding in the parts accordingly and then it is supplied by the spark gap, I surmise.  Then the L2 capacitance and inductance would have to be more carefully matched at this 1:4 ratio.

 

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Chris posted this 12 January 2018

Hey Sampojoe, Agreed. Thanks for the link.

I have reason to believe, and I may be wrong here, but I believe it may be possible that the Parallel Resonant Cap on half of L2, might possibly be a Harmonic of the Primary Resonant Frequency, maybe the second Harmonic.

Don Smith might have been good at drawing Circuits, but he most definitely knew most of the technical aspects about Coils, LC Tanks and Wavelength Theory.

I have said before, and as you already know, some of these devices need to be Grounded, to Earth, and not Negative as such.

   Chris

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sampojoe posted this 12 January 2018

In the youtube "don smith seminar on how to make it"  at the 24m mark you can see he holds up PN NPS 12010, which I believe is 120v at 10kv.   I ordered this at ebay, 10000V-10KV-30mA-Neon-Electronic-Transformer-Power-Supply-Rectifier-50Hz-60Hz.  I assume since it says its rectified, its DC output, which will save the diodes & rectification on the spark gap side of the circuit I do believe.

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sampojoe posted this 12 January 2018

So that would coincide with the 1/4 ratio/wavelength, making it a factor of 4 harmonic?

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Chris posted this 12 January 2018

Hey Sampojoe,

Possibly the 4th harmonic, but this would not give us a very good Current Phase relationship in the two Coils marked as L2.

I believe, possibly the 2nd harmonic, may be better because at the sine at 1/4 wavelength on the second harmonic is a forced function of the wavelengths interactions together, for example, they would be opposite at 1/4 wavelength when in resonance.

This way, as long as the system is in Resonance, the Coil L2 would have opposite phase no matter what, Q would go sky high.

Been a long hot day, am tired so hope this is readable and make a little sense at least?

   Chris

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sampojoe posted this 15 January 2018

In the YT video I mentioned above, "Don Smith Seminar How to make it" Don is interviewed for about an hour and discusses many things.  I am sure it is in one of your videos Chris, and there is that wonderful Don Smith YT Channel you've found too.  At the 37m mark, Donspecifically stated that the circuit does not have to be tuned or run at a resonant frequency.  He said that the NST is pumping the L1 circuit as the driver and provides what the circuit needs.  I am parapharsing from memory here.  So I would say the circuit should be built to operate near what the spark gap would provide if tuned, something in the RF range, but is not the critical factor to have resonance, and be perfectly tuned.  So clearly what may be important would be the jagged waveform generated by the sparkgap, the high voltage, the step-up to even higher voltage and the Bucking coils to rip open the zero point energy field.  I am eager to put an O-scope on it when I get something going.

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sampojoe posted this 15 January 2018

I am moving a little slow on this project as I am finishing up a tesla style DC asymmetric motor first, another couple weeks.  It is a real beast with dual commutators eliminating stupid Edison motor Counter EMF.  I have added in some circuitry to try to reclaim all the energy that should be rattling around in those coils I am kind of excited about and have been working on it for many months off and on...  Its a pretty big motor.  These style motors run at nearly twice the RPM as the Edison style motors.

Chris posted this 15 January 2018

I am sure it is in one of your videos Chris, and there is that wonderful Don Smith YT Channel you've found too.  At the 37m mark, Donspecifically stated that the circuit does not have to be tuned or run at a resonant frequency.

Hey Sampojoe, re the bit about resonance above, if I may suggest, stay reserved on this. I think this is very important, all my experiments show a Resonance is best. Don Smiths book is titled: "Resonant Energy Systems", so it might be an idea to stay very reserved on this.

Only trying to help, don't want to shut doors before you get to them.

   Chris

 

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