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Solid States Devices => solid state devices => Topic started by: Tesluh on October 08, 2016, 09:15:19 PM

Title: How do I test for resonance
Post by: Tesluh on October 08, 2016, 09:15:19 PM
I am doing what I can to make a Don Smith style device, There is a lot of grey area as far as how to make the primary coil and how to get it "into resonance".  I have one that is powered up and appears to be resonating a secondary coil pair, each half is 4 times my primary wire length. the nst is working and the spark gap is nice and quiet.  I have 39.5" of 10 ga multi strand wire wrapped around a 2" acrylic tube, and 2 lengths of 16 ga solid copper wire wound 16 times at a 3" diameter.

My questions,
how do I determine what frequency the nst is producing?
how can I test to see that the coil I am trying to "bring into resonance" has been "brought into resonance"?

there are a lot of youtube videos that are very vague about how to test something like this...
Any help is appreciated!
Title: Re: How do I test for resonance
Post by: Bob Smith on October 09, 2016, 06:17:10 AM
Do you have a scope? You should be able to notice the difference in the wave form when it hits its resonant frequency.
Title: Re: How do I test for resonance
Post by: lancaIV on October 09, 2016, 10:39:03 AM
 "How do I test for resonance" 


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Title: Re: How do I test for resonance
Post by: Paul-R on October 09, 2016, 05:00:43 PM
... how to make the primary coil and how to get it "into resonance".
I'm not too sure about this but you could look into grid dip oscillators used for RF.

https://en.wikipedia.org/wiki/Grid_dip_oscillator
Title: Re: How do I test for resonance
Post by: Tesluh on October 09, 2016, 08:18:58 PM
I'm not too sure about this but you could look into grid dip oscillators used for RF.

https://en.wikipedia.org/wiki/Grid_dip_oscillator
That looks like a handy instrument, will look at those, the ones I found so far are only MHz and I think I need them to be kHz range.  that might be an easy way to do it.

Bob, I don't have a scope but could and should get one.  Could you walk me through connecting and testing?  The nst looks like it could easily fry an oscilloscope if not connected correctly, Would I connect the scope somewhere directly on the circuit?

Thank you!
Title: Re: How do I test for resonance
Post by: lancaIV on October 09, 2016, 09:00:19 PM
That looks like a handy instrument, will look at those, the ones I found so far are only MHz and I think I need them to be kHz range.  that might be an easy way to do it.

Bob, I don't have a scope but could and should get one.  Could you walk me through connecting and testing?  The nst looks like it could easily fry an oscilloscope if not connected correctly, Would I connect the scope somewhere directly on the circuit?

Thank you!


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Title: Re: How do I test for resonance
Post by: Tesluh on October 10, 2016, 03:18:12 AM
Anyhow, If Bob or anyone else can help me tune a coil "into resonance" using an oscilloscope or whatever device I need to find, I would be appreciative.  If it leads me to figuring out how to build a Don Smith device that works the way he said it would, I will share with this forum.  Many hundreds have tried and I think the reason many have failed is that they never got both coils truly into resonance.  That and there are so many different schematics and recommendations that to sift through them all and come up with one that actually functions both primary side and secondary, would be a miracle.
Title: Re: How do I test for resonance
Post by: citfta on October 10, 2016, 04:30:25 AM
I don't want to be the bearer of bad news but if you actually get a Don Smith device to work that would truly be a miracle.  As far as I am aware he never showed an actual working device where you could see the circuit and parts.  I have worked in electronics for over 50 years and I watched some of the videos of Don.  Don used a lot of technical terms that he either was intentionally misusing or did not understand their actual meaning.  He also did not have any understanding at all about how to tune a circuit to resonance.  He said in one of the videos I saw that you can use the nomograph chart from the ARRL Amateur Radio operators handbook to tune a transformer to resonance.  He clearly did not have the least understanding how to use that chart.  He claimed you could tune the transformer by putting a proper value resistor across the primary.  That absolutely will NOT change the resonant frequency of the transformer.  It will only change the Q value of the transformer.  Tuning a circuit to resonance can be done a couple of ways.  If you don't care about the frequency then you can adjust the frequency until the circuit goes into resonance.  If you want the circuit to resonate at a particular frequency then you have to adjust either the capacitance or the inductance of the circuit until you reach resonance.  If you are tuning a parallel resonant circuit when you reach resonance the current going into the circuit will drop to a minimum value.  If you are tuning a series resonant circuit then the current will go to a peak value when the circuit is in resonance.  As someone has already posted a grid dip meter and a scope are your two best tools for finding the resonant frequency of a circuit.  A frequency counter and a function generator are also useful tools for working with resonant circuits.  If you are serious about wanting to work in electronics then you need to get a copy of the ARRL Amateur Radio operators handbook and start studying so you can better understand what you are doing.  You will also be better equipped to recognize when someone is just using a bunch to technical terms to impress even when they don't know what they mean.  You can find some nice used copies of the book on Ebay.  It starts out with the very basics and goes almost up to engineering level of electronics.  It is a very easy to understand book as it is written for those with no technical background.

Sorry for such a long post but I see so many people wasting so much time on trying to get any of Don's devices to work.  They could be spending their time and money on other projects that show much better results.

Respectfully.
Carroll
Title: Re: How do I test for resonance
Post by: lancaIV on October 10, 2016, 05:51:08 AM
I don't want to be the bearer of bad news but if you actually get a Don Smith device to work that would truly be a miracle.  As far as I am aware he never showed an actual working device where you could see the circuit and parts.  I have worked in electronics for over 50 years and I watched some of the videos of Don.  Don used a lot of technical terms that he either was intentionally misusing or did not understand their actual meaning.  He also did not have any understanding at all about how to tune a circuit to resonance.  He said in one of the videos I saw that you can use the nomograph chart from the ARRL Amateur Radio operators handbook to tune a transformer to resonance.  He clearly did not have the least understanding how to use that chart.  He claimed you could tune the transformer by putting a proper value resistor across the primary.  That absolutely will NOT change the resonant frequency of the transformer.




  It will only change the Q value of the transformer.
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https://de.wikipedia.org/wiki/Elektromagnetische_Ma (https://de.wikipedia.org/wiki/Elektromagnetische_Ma)ßeinheiten         how to tune/change formula 




 Tuning a circuit to resonance can be done a couple of ways.  If you don't care about the frequency then you can adjust the frequency until the circuit goes into resonance.  If you want the circuit to resonate at a particular frequency then you have to adjust either the capacitance or the inductance of the circuit until you reach resonance.  If you are tuning a parallel resonant circuit when you reach resonance the current going into the circuit will drop to a minimum value.  If you are tuning a series resonant circuit then the current will go to a peak value when the circuit is in resonance.  As someone has already posted a grid dip meter and a scope are your two best tools for finding the resonant frequency of a circuit.  A frequency counter and a function generator are also useful tools for working with resonant circuits.  If you are serious about wanting to work in electronics then you need to get a copy of the ARRL Amateur Radio operators handbook and start studying so you can better understand what you are doing.  You will also be better equipped to recognize when someone is just using a bunch to technical terms to impress even when they don't know what they mean.  You can find some nice used copies of the book on Ebay.  It starts out with the very basics and goes almost up to engineering level of electronics.  It is a very easy to understand book as it is written for those with no technical background.

Sorry for such a long post but I see so many people wasting so much time on trying to get any of Don's devices to work.  They could be spending their time and money on other projects that show much better results.

Respectfully.
Carroll
Title: Re: How do I test for resonance
Post by: Tesluh on October 10, 2016, 03:09:18 PM
I believe in miracles!  (but I also believe the people who tried to copy dons devices were doing many things wrong which added up to most of them not working.)
Title: Re: How do I test for resonance
Post by: citfta on October 10, 2016, 04:53:09 PM
I believe in miracles!  (but I also believe the people who tried to copy dons devices were doing many things wrong which added up to most of them not working.)

I don't want to  be argumentative about Don's work but you posted most of them don't work.  Can you show my just one that does work?  I have not seen any that even claim to work.

Respectfully,
Carroll
Title: Re: How do I test for resonance
Post by: Tesluh on October 10, 2016, 05:58:10 PM
https://www.youtube.com/watch?v=evymdn4LC2A

This guy seems to be close, "zilano" and "dynatron" are internet names of people who seem to have found the way to make dons principles work.  I do not have a video of a device of dons convincingly doing as he says "the 8000v 20a battery that never runs down".  If you search for "Zilano don smith" it turns up a lot of information, Zilano seems to be the expert on this device.
Title: Re: How do I test for resonance
Post by: citfta on October 10, 2016, 06:07:33 PM
I am familiar with Zilano's claims.  Believing in miracles is fine.  Believing in fairy tales is not too wise.

I gave you some information about how to tune for resonance and how to tell if you had gotten a circuit into resonance.  What you do with that information is of course entirely up to you.  I won't waste anymore of your time or mine discussing whether the Don Smith device was real or not.  You will eventually find out for your self that you are wasting your time and efforts on a device that doesn't do what it is claimed it can do.

Respectfully,
Carroll
Title: Re: How do I test for resonance
Post by: Tesluh on October 10, 2016, 06:33:25 PM
I'm sure the wright brothers were given the same cautionary tale...I've heard it at least a hundred times myself.  What they did differently is what made their invention work.  Can use what others like tesla or don or zilano have learned but until you get out in the workshop it's all just theory.  I appreciate the resonance advice I think don adding a capacitor was to change the capacitance of the coil to bring it to resonance. Need to get some tools and that book you mention sounds like good reading if I am going to be tinkering in this arena.   
Title: Re: How do I test for resonance
Post by: lancaIV on October 10, 2016, 09:17:23 PM
I'm sure the wright brothers were given the same cautionary tale...I've heard it at least a hundred times myself.  What they did differently is what made their invention work.  Can use what others like tesla or don or zilano have learned but until you get out in the workshop it's all just theory.  I appreciate the resonance advice I think don adding a capacitor was to change the capacitance of the coil to bring it to resonance. Need to get some tools and that book you mention sounds like good reading if I am going to be tinkering in this arena.   


Hello Tesluh Inever heared from "wright brothers" and their cautionary tales
but I have heared about 'Wright brothers' and their trial to get something like a plane to fly and
they have had help : by their innovative sister ! Wright brothers and sister


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Title: Re: How do I test for resonance
Post by: Tesluh on October 11, 2016, 03:01:40 AM
lanca, do you hand type the gibberish you use to spam people's threads or do you have a special auto-gibberish generator?
Title: Re: How do I test for resonance
Post by: Tesluh on October 11, 2016, 03:54:57 PM
I currently have a primary coil that is 78" long 10ga stranded wire with 4 wraps around a 2" tube.
My secondary is two coils about 3" diameter 16ga solid 158" each (twice as long as the primary and when connected at the center should be 4 times as long).

Math I did put the primary to resonate at 37.5mhz.  the nst supposedly puts out something like 9kv at 37.5 kHz.  When I fire up the primary and use what I call a "voltage sniffer" I can put the secondary 5 feet rom the primary and the sniffer lights up brightly.  This tells me that something is happening in the primary to excite the secondary.  I may have to adjust spark gap and primary capicitor to get better resonance in the primary. 

Going to try to get a scope today and see what I get for readings on the primary. I have a capacitor across the primary and one half of the secondary.

This part of it is all tesla coil building, anyone who has built tesla coils and can look over my coils lengths and offer advice for tuning I would be appreciative.
Title: Re: How do I test for resonance
Post by: Tesluh on October 15, 2016, 10:01:29 PM
https://www.youtube.com/watch?v=TI5XWz8aZvo  this is possibly the most convincing demo of a working assembled Don smith device I have seen.  questioning if my nst is working properly and giving me problems after seeing this video.
Title: Re: How do I test for resonance
Post by: antimony on November 29, 2016, 02:59:50 PM
I also like to master the knowledge of finding the resonant frequency of a coil, or LC circuit.
I recently bought a cheap function generator from China, but i have a problem with it because it only has one probe, and there seems to have to be two probes when I have searched for tutorials on Google and on YouTube.

Title: Re: How do I test for resonance
Post by: Tesluh on November 29, 2016, 03:08:30 PM
the "probe" on my function generator has a two pronged lead.  you need the signal generator and an oscilloscope which also has a probe.  I finally was able to get my equipment to determine the resonant frequency of a coil.  I am not sure how exact the frequency i am coming up with is but I get the rising and falling waveform on the scope.  tried three different signal generators (not sure if I was using them correctly) and ended up with this one that has a built in frequency counter.  https://www.amazon.com/gp/product/B0199SVAIY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Title: Re: How do I test for resonance
Post by: Tesluh on November 29, 2016, 03:16:42 PM
the second probe you are referring to might be the frequency counter.  I don't understand the use of a frequency counter unless the output on the signal generator isn't easy to determine.  when it's a digital readout I'm pretty sure the frequency from the counter and the frequency out but by the generator are the same.
Title: Re: How do I test for resonance
Post by: antimony on December 02, 2016, 11:35:56 AM
the "probe" on my function generator has a two pronged lead.  you need the signal generator and an oscilloscope which also has a probe.  I finally was able to get my equipment to determine the resonant frequency of a coil.  I am not sure how exact the frequency i am coming up with is but I get the rising and falling waveform on the scope.  tried three different signal generators (not sure if I was using them correctly) and ended up with this one that has a built in frequency counter.  https://www.amazon.com/gp/product/B0199SVAIY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

I had two probes on my oscilloscope but now i am using only one channel, and the other probe on the FG-100.

Im not sure if i have one in this cheap fg, but my oscilloscope is able to measure the frequency.

I will probably get another one if i am not able to figure oiut how to use this one soon. :)
Title: Re: How do I test for resonance
Post by: Tesluh on December 02, 2016, 02:30:32 PM
does your function generator have a lead with two ends?  mine has a jack that you plug into that says output and the cord has two alligator clips.
Title: Re: How do I test for resonance
Post by: Tesluh on December 02, 2016, 02:34:27 PM
if your scope can measure the frequency and it changes when you change the function generator frequency you are most of the way there.

Title: Re: How do I test for resonance
Post by: antimony on December 05, 2016, 02:38:31 PM
does your function generator have a lead with two ends?  mine has a jack that you plug into that says output and the cord has two alligator clips.

I use my oscilloscope probe. It has one ground clip and one hook.
Title: Re: How do I test for resonance
Post by: Tesluh on December 05, 2016, 02:59:32 PM
some people say a resistor is needed to test to find resonance frequency with a scope, im not sure how accurate my tests are but its better than nothing.  you can try it how you have it, hook both alligator clips to one leg of a parallel tank circuit and the two probes to the other leg.

 do you have an lcr meter to estimate the inductance of a coil?  that would give you a good point to start.   you want to get your scope on a timebase that will show a single trace, for instance 100khz is 10microseconds.  if you have the timebase much higher or lower you might not see the trace properly on the screen.

Title: Re: How do I test for resonance
Post by: antimony on December 05, 2016, 06:40:52 PM
some people say a resistor is needed to test to find resonance frequency with a scope, im not sure how accurate my tests are but its better than nothing.  you can try it how you have it, hook both alligator clips to one leg of a parallel tank circuit and the two probes to the other leg.

 do you have an lcr meter to estimate the inductance of a coil?  that would give you a good point to start.   you want to get your scope on a timebase that will show a single trace, for instance 100khz is 10microseconds.  if you have the timebase much higher or lower you might not see the trace properly on the screen.

I'm posting from my phone, so i can't link you to the generator that i have, but it is called FG-100.
I guess I should buy a function generator probe so i use both channels of the oscilloscope, they aren't that expensive.

I have a LCR meter, but I am a newbie when it comes to the oscilloscope, but it is good advice.

I have used Gotolucs yt series about coil resonance, and I haven't been able to get going with anything becouse i don't have the right experience with electronics, but I would figure that i would be able to make use of what I got even if my equipment doesn't match Gotolucs.
Title: Re: How do I test for resonance
Post by: Tesluh on December 05, 2016, 06:52:32 PM
try this next time you are experimenting.

probe on your fg100
probe on your scope (one channel, doesn't matter)
capacitor
coil

use your lcr meter to measure inductance of coil usually in uh (microhenries)
input inductance of coil and capacitance of capacitor into this calculator (this will give an estimate of the resonant frequency)
http://www.ham-radio.com/lc.html

put one each of capacitor ends and coil ends together (parallel) and then put your two probe ends on one side of the capacitor, and the two "neg" alligator clips on the other side.  set your fg100 to the frequency you got in the calculator and see what shows up on the scope. 

Title: Re: How do I test for resonance
Post by: Tesluh on December 06, 2016, 03:12:29 AM
this video shows how to connect everything in parallel.  The green jumper is just an extension for his probe.

https://www.youtube.com/watch?v=G_RCyDdt2rM