Resonance Effects For Everyone To Share

[ren]

Hi Luc,

Ive been a little slow coming to the party here, partly because of another build. Cant crowd my plate too much.

But today I finally scored a 2 channel oscilliscope AND a 600khz sig gen. Im looking forward to trying some of the early stuff you have set up, perhaps get some mosfets going too.

Regards

[gotoluc]

Hi Ren,

thanks for your interest and update

All the best to you in your experiments with Resonance

Give us an update when you can.

Luc

[ren]

Hi Luc,

I have been tinkering around with my function generator to try and get a feel for it. I have some very BASIC questions.

I didnt get a lead with it so I am just using clip leads ATM. There are three outputs, one is ground and is able to be coupled with one of the other outputs. In the manual it describes balanced and unbalanced operation for this I believe.

I couldnt get the outputs to work properly when connected to a load unless I put some resistance in series with one of them? Is this normal? Perhaps it is factored into the factory/proper leads already, hence my dramas.

Once this is in place I can apply both leads to either side of my parallel LC. Sweeping frequencies I am able to see on my scope a rise in the waveform and voltage present. Since this only occurs at select frequencies and returns to the normal size when the cap is removed I am going out on a limb and thinking this might be a resonant spot. Its fairly tricky to tune to, a little one way or the other and you are back to normal.

Anyway if you can offer me any suggestions or tips with my sig gen that would be helpful. I havent been able to light a light in series with it as yet, and I am still trying to get a current(ma) reading?

The Sig gen I have is a very old one, HP 200cd and supposedly has 10v output under load.

As you can tell I am very new to this, but any advice you or others can offer on setting up and taking measurements is much appreciated.

Regards

[mklimesh]

Hi Rosemary,

If you look at the video Luc put up it seems to prove what you have been saying (+_+)

YouTube - Effect of Recirculating BEMF to Coil test 3

Good show Luc

Mike Klimesh

[gotoluc]

Hi Rosemary,

If you look at the video Luc put up it seems to prove what you have been saying (+_+)

YouTube - Effect of Recirculating BEMF to Coil test 3

Good show Luc

Mike Klimesh

Sorry Mike but you just posted this in my Resonance topic.

Luc

[brusers]

Update and question

First the picture with an explanation, then a question.

This is something I did by accident. On the left was my long bifilar secondary (blue) with it's primary connected to a diode and small DC motor. Neither the top or the bottom of the blue coil are connected to anything.
On the right is my single wire wound secondary (red), with it's primary connected to a transistor and a 12v battery, being switched by my function generator. The red coil wire is also open on both ends.



I had set aside the blue one to play with the red one, and out of nowhere the motor on the blue setup started running. So I assume the tuning is similar for both of these coils. But it surprised the hell out of me because I had it connected to nothing, I was not expecting it to take off. If I do connect the bottom of the blue coil to the bottom of the red coil, I can put these things (most I have tried so far) up to 30 feet away, and still run motors and lights over that one wire. Sweet.. But I have not tried an actual ground. Still playing around here.

Question 1 of 2: When the coils were close and not connected, obviously there was wireless propagation going on there. But when they are far apart, say 30 feet, and the secondaries are connected by the single wire, at that point is there actually anything being propagated through the open air? Or is this propagation happening solely in the one wire connection of the secondaries (acting as a common ground connection)?

Question 2 of 2: I had a friend look at this and I showed him, and he tried to tell me that it was normal induction. Am I taking crazy pills or what because I though the run of the mill university induction needed to be a closed loop to work, and maybe a bit closer than one foot away. How does this differ from normal EE stuff and/or the MIT wireless that is just coming out?

Every day gets more and more interesting..

I appreciate any comments!
Thanks,

Marcel

[brusers]

To ren

Hey ren, if I my throw some stuff your way.

My previous function generator was a bit strange. I had noticed that when I had too low of a resistance the signal would just kill out. Or when I tried to use it to switch a transistor it would not work. The scope showed something like a 10 or 12vpp but it would not light a bulb. If you hook it straight to a bulb alone does that light it up? With mine I could not get any effects happening in my experiments, I think it was just a cheap generator. I ended up just getting another function generator, and using the old one for crystal radio parts..

The raise in the waveform should be the resonant frequencies that you are seeing. If you change the capacitance you should notice that the resonant frequency changes a bit. The raise is the energy being passed back and forth from cap to inductor. At resonant frequency this is a max exchange I guess you can say. Some capacitance values will pass better, giving a higher amplitude. As well as different coil configurations having different values of their own. Something to play with.

About the current, I'm pretty sure you are going to have to do some math, or eyeball it with the series light bulb, the average meter will not read the high frequencies. I have not passed that hurdle yet myself. Right now though I'm still working on getting a better resonance interaction between primary and secondary, my setup still needs some tuning. But when the time comes I think the series light bulb thing will be good enough for me.

Hope I helped,

Marcel

[ren]

Hi Marcel,

Thanks for your reply.

Yes it does help somewhat to see you had a similar dilemma to me.

I found the same thing regarding resistance, the wave form would die/collapse, unless there was some resistance in series with one of the output leads. I may need to get a smaller globe, or perhaps I do need a different Sig Gen with more output to actually light a light.

But I did some simple calculations and Im pretty confident I have built a parallel resonant circuit. Basic stuff, but exciting for me none the less.

I have a multi tapped radio coil which has an inductance of 0.33mH and I paralleled a 1.72nF capacitor with it. A resonant calculator spits out a frequency of 211 kHz. I found that mine resonated close to that, at 227.2 kHz, or that is where the wave expanded the greatest.

Changed the cap to a 7.71nF and it tells me 99kHz is its resonant frequency, I found the highest peak to peak now is at 94kHz. So each time its pretty close. I guess there could be inductance/capacitance in the leads and attachments that I havent factored in as well.

I think I will look into Gotolucs original flip flop circuit, I believe he used his signal generator to switch it? This would solve my problems, as I would be able to control a dc input with the sig gen, and produce a square/sine'ish wave over my circuit.

If you're still watching Luc, what is the best performing version of your circuit that you worked on with groundloop? Is there anything to watch out for?

Many thanks.

[gotoluc]

Hi Marcel and Ren,

that's great what you have there Marcel 30 feet of wireless electricity transfer in my book is quite something but what do I know since all this stuff is new to me. Maybe others can comment.

You know Ren, of all the versions it is still the first H-Bridge circuit that I use. I think it is the best model for this. I would be great if someone could add duty cycle adjustment to it though. Use the IRF840 for mosfet but nothing wrong with the IRF640 if you have them. You only need to be careful of the voltage you put into the circuit. If you keep it to 50vdc or less I don't see a problem. The weak component is the IR2103, if they get too hot they will catch on fire, so monitor their temperature when you're pushing the circuit to its limits. Make sure you buy 4 extra or more of the IR2103 when you order them on eBay and you wont regret it.

Great little circuit. Have fun and post your findings please.

Thanks for sharing

Luc

[ren]

Thanks Luc,

I am also working on a tl494 driven flip flop. It should have adjustable duty cycle. Im basically pinching a circuit that uses the tl494 to drive the primary of a SSTC.

I will be building the first circuit then, I still like the idea of sig gen input, but hopefully I can get the tl494 to run good and have frequency options so it can cover a broad spectrum.


Regards

[gotoluc]

Sounds good Ren

Oh, how I would love to have a variable duty cycle square wave Ture AC switch with voltage handling capabilities of a 1000vdc

Keep us posted.

Luc

[brusers]

One wire transmission

Alright, here it is..

YouTube - Tesla type transmission

I had to just throw this up to show it, tomorrow I will be tearing apart some of my stuff for other related experiments..

I'm not sure if the concrete wall thing is significant, but I wanted to show it just because it's hard for me to believe this is just normal induction rules when every bit of power seems to be getting to the other end.

Anyhoo, I hope the video is enjoyed as much as I enjoyed messing with the stuff..

Marcel

[ren]

Hi Marcel,

great vid. Can you give me some more info on your primary circuit? You said transistor? How are you pulsing it? And its straight dc?

Regards

[gotoluc]

Hi Marcel,

excellent experiments, results and video demo

I would also like to know your pulsing method or circuit

Keep it coming!... and thanks for sharing.

Luc

[Armagdn03]

Revising...