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  #61  
Old 06-09-2011, 02:04 PM
Farmhand Farmhand is offline
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I just had a thought.

Is there any reason I should not connect the negative of the primary to the negative of the secondary and ground ? Because if I do that I think I would be pumping a lot of energy into the ground.

I am collecting the collapsing field to charge another battery, but if I disconnect it the protection neon fire's, I think if I connect a ground there it will stop the neon fireing but that seems like a waste. Or is that part of the effect ?

Do I need to get higher voltage Mosfets so they can take the field collapse without a recovery battery or ground connection there ?

The charging of the second battery is very good with particular setup, but that is not the goal. It seems wrong to collect the collapsing field with this.

Any thoughts

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  #62  
Old 06-09-2011, 09:17 PM
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OK now it's working, at around 50 Khz i can get over 40 volts at the receiver. Light's LED's no probs. It even blew a 5mm LED. The cap I had on the AC was blocking the energy.

I'm still using the aluminium plate for a ground, just laying it on the concrete it isn't even clean, one side of the plate is still covered in plastic.

Anyway what I did was connect the primary negative to ground with the secondary on the transmitter, a "real" ground, then the receiver I use the metal plate layed on the concrete, the LED is the same brightness even if the receiver ground is connected to the transmitter ground or not, must be what he say's is an inductive relationship with the ground ( same thing that ruins batteries if they are left on the ground). And I removed the recovery battery. Neons light from the toroids no problem now.

With about 50 Ma input I can remotely light an LED from the receiver output at pretty much full brightness.

Under load with 1 x 5mm LED ( that's the only LED I have left ) the transmitter toroid reads 2.5 volts AC and the voltage across the LED is 2.94 volts. Which seems like good transfer considering they do not share a ground connection and 50 Ma @ 12 volts input..Care must be taken when using caps on the receiver output because the voltage keeps rising to about 50 volts with no load, that's how I blew the LED.

The effect is there resonant or not so I am very happy. seems to me they work like a step up and step down transformer connected but they are separate.

On second thought I think the coupling distance on the primaries is just fine. As Nikola says these things can be adjusted for our own personal requirements, the coupling distance the number of turns the thickness of the wire the input voltage and many other things could be changed in differing cominations to acheive different effects.

I can't wait to excite it at it's resonant frequency.

The number of winds in the secondary would really be dependant on the distance it needed to transmitt. I think Nikola talks about that.

After I have a sleep I'll make a video showing how I have it working. I never would have thought I could build a Magnifying Transmitter in three days.

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  #63  
Old 06-10-2011, 12:34 PM
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I went to shoot a video but the battery was drained, so here are some pics instead. I ended up just putting a choke on the recovery to the second battery, I did try grounding the primary negative but that was wastefull, it's funny but with the choke it only just charges the battery but it makes the led brighter and the neon is brighter when touched to the top toroid. With nothing there is ok but I found this is better with than without.

Setup on floor with ground plate only for the receiver.
http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

This shows the tuning capacitor, series inductor, recovery choke and circuit arrangement, I went back to an old circuit for fear of ruining my new one.
http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1

When I light a neon on the transmitter toroid it dims the LED a bit.
http://wv0v9q.bay.livefilestore.com/...007.JPG?psid=1

Exciting the neon through the glass.
http://wv0v9q.bay.livefilestore.com/...008.JPG?psid=1

I'll make a circuit drawing soon of the setup, I am using now a 320 uH inductor and the cap is at full turn at 1300 pF. Running at 50 Khz for these shots. I think I need another 300 to 500 pF for the transmitter cap I'll try the other one the same with it soon.

I wonder what will happen when I connect my toroidal transformer secondary to the transmitter primary with shunt caps between.

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  #64  
Old 06-10-2011, 10:55 PM
Farmhand Farmhand is offline
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Ok I made a video and finally got it uploaded.

YouTube - ‪Transmission Test - 1.wmv‬‏

I've already managed to tune it up to 76 volts at the receiver output ( open circuit ).

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  #65  
Old 06-11-2011, 01:29 AM
cody cody is offline
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Looking good! Looks to me that your still not in tune though. These coils are very sensitive once you get them in tune, just putting your hand by them will knock them out of tune and you will see the load drop off when you do. I suspect that your square wave is giving it enough of a ping to get it ringing a little bit and your receiver is picking up the HV field. Try separating the coils at a greater distance like 5 or 10 meters and see if you can still get anything with the plate and/or ground wire. Distance effects the tuning slightly so you may need to make adjustments.
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  #66  
Old 06-11-2011, 04:01 AM
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Yeah I will need to use Mhz to get it into resonance. I can only play for now but I can learn some things. Putting my hand near it does afect the transfer but I have to get it within a few inch's.

Yeah today I make a base for the receiver for testing the distance transfer.

I am using a square wave but it isn't 50/50. Rectifying and storing the output is proving to be difficult. I have an idea from the testatika machine, U shaped magnetised transformer core's or just a steel core transformer might work.

I guess when the transmitter is in resonance the receiver will output a sine wave so that will be much easier to use than the scratchy wave's at the receiver now. An Ultra fast recovery FWBR might also help with storing the output.

I am thinking my Bob Boyce transformer might be good to use on it if I construct a resonant AC tank with series inductors and caps. It will idle with very low standby input and the output is kind of AC but I have it pulsing about 18 times at 2 us then a pause to the next group, could be worth a look for the fun of it I should maybe reconfigre the controller to three phase (three single pulses).

This is what the waveform from the secondary of my transformer looks like. I can make it so there is no pause and all 2 us pulses with 2 us between, well I think I can. However if I reconfigure the controller to three phase I can tripple the effective frequency and hex it if the output is AC.
http://public.bay.livefilestore.com/...006.JPG?psid=1

What happens if I use AC to excite the primary ? Is it better or worse than DC for the primary power ?

Anyway I have to cut MDF boards and paint the edge's. But it is raining all weekend, looks like. I have to stoke the fire to dry the paint. The way I mounted the tall former was I screwed a pill bottle to the board and the pipe slide's onto that.

Cheers
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  #67  
Old 06-11-2011, 06:55 AM
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Hi Cody, you were right about the ground connection when I put this cap pulser on the receiver output I got just 65 volts on the cap with the ground plate only, but then when I connected the receiver ground to the actual ground connection I got over 95 volts. The discharges in the neon are affecting my computer and making it make the sound of disconnecting a USB device every now and then.

I can't cut boards because of the rain. When it stops I can do it.

Here is a video clip of the 4.4uf neon fired SCR cap dumper working from the receiver.
YouTube - ‪Pulsing battery From Receiver.wmv‬‏

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  #68  
Old 06-11-2011, 08:18 AM
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Magnifying Transmitter Prinipal ?

Anyone ever think about the Magnifying transmitter like this.
http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1
I just fixed the drawing, I left out an arrow.

I think I am seeing a feedback from a power surging the receiver seems to send back any excess potential it has to the transmitter to equalise thier potentials. Interesting.

Here is a circuit I dreamt up for the receiver, craziest circuit I ever drew.
http://public.bay.livefilestore.com/...001.JPG?psid=1

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Last edited by Farmhand; 06-11-2011 at 09:11 AM. Reason: Fixed drawing
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  #69  
Old 06-11-2011, 12:02 PM
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When an atmospheric electrical discharge happens there is a rapid exchange of energy back and forth through the discharge stream.

These two pictures are frame's from a video, I captured them to show the Power Cone, we can only see the cone above ground the inverted one. It's opposite would be below ground .

Phase one.
http://public.bay.livefilestore.com/...s-1.jpg?psid=1

Phase two.
http://public.bay.livefilestore.com/...s-2.jpg?psid=1

And this is a supernova. It is obvious to me these are similar. The supernova picture is taken over a long period of time, so the oscillation cannot be observed.
http://public.bay.livefilestore.com/...250.jpg?psid=1

It is the way of the Universe to swap energy back and forth for eternity for free all losses are recycled immediately no one has to pay the Universe for a lightning strike to take place, and yet they do. The lightening actually looks like oscillations in a big LC Tank circuit if you turn you're head the right way.

It all looks a bit pyramidal and vortexian to me.

The Magnifying Transmitter would have an AC oscillation from top to bottom wouldn't it ? And with an identical Receiver they would have a longitudinal oscillation between them at the top through the air and also at the bottom through the earth and the Receiver would also oscillate with AC from top to bottom.

So we would then have a four way oscillation, all ways trying to equalise but can't.

Pure Genius. Tesla impresses me more and more each day. His name will become almost immortal and he with it.. Through sheer hard work in one lifetime he acheived it, that is very impressive. I have no doubt that in 1000 years time if civilised man still walks the earth Tesla's name will be spoken.



Edit I'll just add this video clip link here.
YouTube - ‪Tansceiver waveforms.wmv‬‏

..
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Last edited by Farmhand; 06-11-2011 at 12:20 PM. Reason: Added Video Link
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  #70  
Old 06-11-2011, 12:09 PM
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check out this thread, you might like what you read, some of the experiments i talk about actually use cones to capture electromagnetic waves....

a better way to present the periodic table

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  #71  
Old 06-11-2011, 02:03 PM
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Quote:
Yeah I will need to use Mhz to get it into resonance. I can only play for now but I can learn some things. Putting my hand near it does afect the transfer but I have to get it within a few inch's.

Yeah today I make a base for the receiver for testing the distance transfer.

I am using a square wave but it isn't 50/50. Rectifying and storing the output is proving to be difficult. I have an idea from the testatika machine, U shaped magnetised transformer core's or just a steel core transformer might work.

I guess when the transmitter is in resonance the receiver will output a sine wave so that will be much easier to use than the scratchy wave's at the receiver now. An Ultra fast recovery FWBR might also help with storing the output.

I am thinking my Bob Boyce transformer might be good to use on it if I construct a resonant AC tank with series inductors and caps. It will idle with very low standby input and the output is kind of AC but I have it pulsing about 18 times at 2 us then a pause to the next group, could be worth a look for the fun of it I should maybe reconfigre the controller to three phase (three single pulses).

This is what the waveform from the secondary of my transformer looks like. I can make it so there is no pause and all 2 us pulses with 2 us between, well I think I can. However if I reconfigure the controller to three phase I can tripple the effective frequency and hex it if the output is AC.
http://public.bay.livefilestore.com/...006.JPG?psid=1

What happens if I use AC to excite the primary ? Is it better or worse than DC for the primary power ?
I prefer using AC for these small tests, you get twice the voltage on the primary that way. Even better is AC square wave, that will smack it real good and get an even greater voltage gain on the secondary. Also with AC you can insert a series capacitor with the primary to form a series tank circuit and that will ramp up the voltage on the primary much higher if designed correctly. But your setup seems to be working real good, Im not really familiar with the circuit you are using but it appears it is inputting a higher voltage than the 12V battery you are running with. Have you measured the voltage it outputs to the primary? DC setups in my opinion seem to become advantageous for overcoming the engineering difficulties of getting really high voltage onto the primary at high frequency. For your recovery on the receiver try to hunt down some 1n4148 diodes. You can usually find them in junk electronics, they are very small and glass. I find them to work great for these little setups.
http://www.datasheetcatalog.org/data...ohm/1n4148.pdf
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Old 06-11-2011, 02:11 PM
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Ok done some reading, here.

Comparative Study of the Tesla and Marconi LF Wireless Systems

Interesting Quote's from the page.
Quote:
Power supply waveform

Hertz/Marconi system: perfectly sinusoidal AC at oscillator frequency

Tesla system: dc pulse or square wave at oscillator frequency plus low frequency impulses of great intensity and short duration.

Quote:
I reduced the number of poles, I think, in 1901. But then I reduced it for the purpose of generating currents of higher frequency. If I had a great number of poles, I could not realize my idea, because these poles would come in quick succession and not produce a rate of change comparable to the rate of change which is obtainable by the discharge of a condenser owing to a sudden break of the dielectric. That is to say, a blow. It has to be a blow, you see. I had to place my poles comparatively far apart, then run them at excessive speed and generate comparatively few impulses, but each of those impulses are of such tremendous intensity that the dynamo is practically short-circuited. That gave me a blow which replaced the arc. . . . [NTAC, p. 15]
Quote:
Excitation of propagating medium

Quote:
Marconi antenna / half-wave dipole, the electric field energy and the magnetic field energy are introduced into the field medium in time-phase with each other. The excitation of the medium by the antenna develops an in phase propagation mode shifting to a quadrature phase propagation mode, this taking place over the initial range of transmission; Fresnel zone, also called the radiating near field. The launching structure provides a good initial impedance match with free space resulting in the efficient production of electromagnetic waves.
Quote:
Tesla antennas, electric current in lower half-space; TM surface wave, spiraling electrostatic and magnetic flux lines in dielectric portion of upper half-space; electric current and magneto-hydrodynamic waves in ionized portion of upper half-space. The launching structure is specifically designed to have a poor impedance match with free space. Its configuration inhibits the launching of electromagnetic space waves. Provided with sufficient input power, a large magnifying transmitter is capable of ionizing and breaking down the denser insulating portions of the earth's atmosphere around and above it, rendering this medium electrically conducting.
Quote:
In Tesla’s system the transmitter and receiver are interdependent. The transmitting element consists of three sub-elements, a single coiled wire conductor—a helical resonator—possessing inductance, and two conducting bodies of large surface area in relationship to their greatest linear dimension, which have a mutual electrical charge storage capacity. One of these bodies is the elevated terminal positioned above the resonator. The other body is the earth itself. The receiving element also consists of three sub-elements, a helical resonator and two conducting bodies of capacitance, one of which is an elevated. As with the transmitter, the other body is the earth. It is this common conducting body, which forms the ground connection between the transmitter and receiver through which alternating electric current flows. The other connection required to form a closed circuit is through the air by electrical conduction in plasma and electrostatic induction. The movement of energy is in both directions, from the transmitter to the receiver and visa versa.
Looks like a sine wave input is out of the question.
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  #73  
Old 06-11-2011, 02:34 PM
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Quote:
Originally Posted by cody View Post
I prefer using AC for these small tests, you get twice the voltage on the primary that way. Even better is AC square wave, that will smack it real good and get an even greater voltage gain on the secondary. Also with AC you can insert a series capacitor with the primary to form a series tank circuit and that will ramp up the voltage on the primary much higher if designed correctly. But your setup seems to be working real good, Im not really familiar with the circuit you are using but it appears it is inputting a higher voltage than the 12V battery you are running with. Have you measured the voltage it outputs to the primary? DC setups in my opinion seem to become advantageous for overcoming the engineering difficulties of getting really high voltage onto the primary at high frequency. For your recovery on the receiver try to hunt down some 1n4148 diodes. You can usually find them in junk electronics, they are very small and glass. I find them to work great for these little setups.
http://www.datasheetcatalog.org/data...ohm/1n4148.pdf
Yes an AC square wave is appealing, but really high frequencies may be easier with DC.

The circuit I put together is basically Tesla's Ignition coil patent drawing modified for the transmitter, the only change is the transformer.

Tesla Ignition coil patent
NIKOLA TESL-A - Google Patents

My circuit. is the generator side of this.
http://public.bay.livefilestore.com/...ver.JPG?psid=1

If the cap is sized right the inductor discharges into the cap and charges it to above supply voltage. Then the cap discharges through the primary coil. I am trying to discover the cap inductor values for this primary, I think I am close. I tried measuring the cap it said 11.5 volts, I think this is a current amplifier because the cap is in parallel with the inductor. The energy stored in the inductor gets added to the supply but I'm not sure of the actual mechanics of it I have yet to determine that, but it is very effective.

I drew it for a spiral transmitter, before you guys showed me this one. Which I think is the better design. Especially for no spark gap because at this time I think he was just using abrupt switching as in the quote in the post above. Hence the closer coupling. i think, i need to read more.

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  #74  
Old 06-11-2011, 04:38 PM
cody cody is offline
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Quote:
Looks like a sine wave input is out of the question
I wouldnt say that. The high frequency alternators used by Marconi were actually tesla's invention. They later became known as alexanderson alternators. Either way they were teslas design and he used them a lot for his wireless system. But yes, for his final design he did say he preferred using DC, but either will work. My main reason for suggesting it is because i think its the easiest way to really comprehend how to tune the system and how different things you do effect the tuning. Personally i have found a function generator with a built in frequency counter to be the best learning tool for understanding tuning of the system. I had built oscillator circuits and ran many tests like you are doing and thought i understood the tuning, but it wasnt until i got a decent function generator that i really got a grasp on it. But thats just me.

I looked at your circuit again and it looks to me like a DC resonant charging circuit except you are using a transistor instead of a spark gap. Thats an interesting idea, i like it. I wonder if it would work better if you put in a de q-ing diode between the battery and the inductors. Here is a typical DC resonant charging circuit. See the first capacitor after the bridge rectifier, that is basically your battery. If you add the diode it shoud ensure that no current flows back into the battery before the transistor fires.



So it would look like this:



If you want to read some of the theory of the circuit and why im suggesting to try a diode you can read here:
DC Tesla Coil design
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Old 06-11-2011, 07:32 PM
kapierenundkopieren kapierenundkopieren is online now
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Hi Guys! I'm interested in replicating the wireless power transmission, but i have no function generator or even a oscilloscope. Right now i'm searching for a variable 4MHz to 10MHz square wave generator schematic that would fit in, or any other oscillator that would work for this project. I was looking here: Square Wave Generator
Does anyone know if this is suitable for such frequencies?
Also, could someone more experienced than me draw a schematic for let's say a 10W or 20W output?
Or can i get any advice about this idea like what transistor to use on the output of the oscillator?

Thx in advance!

Dann
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  #76  
Old 06-11-2011, 07:58 PM
cody cody is offline
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There are many threads about self oscillating circuits on the forum. The joule thief or ss bedini or any variant of exciter should work if designed properly. That would be a simple way to get startedIf my memory is correct i believe slayer posted a simple oscillator circuit on a wireless setup if you do some searching on the forum. A cheapo chinese function generator that would work fine would cost around $100 or so but would not put out 10 or 20 watts directly but could be used to drive higher wattage circuits. You dont need much power to see results though. You can get by without an o-scope by suspending an AV plug near the coil and using a multimeter to look for the peak voltage across the LED as you tune.

I would suggest not starting off with a target in the MHz though. Tesla's system ran around 20KHz and there is good reason to keep your target resonant frequency low.
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Old 06-11-2011, 11:05 PM
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Quote:
Originally Posted by cody View Post
I wouldnt say that. The high frequency alternators used by Marconi were actually tesla's invention. They later became known as alexanderson alternators. Either way they were teslas design and he used them a lot for his wireless system. But yes, for his final design he did say he preferred using DC, but either will work. My main reason for suggesting it is because i think its the easiest way to really comprehend how to tune the system and how different things you do effect the tuning. Personally i have found a function generator with a built in frequency counter to be the best learning tool for understanding tuning of the system. I had built oscillator circuits and ran many tests like you are doing and thought i understood the tuning, but it wasnt until i got a decent function generator that i really got a grasp on it. But thats just me.

I looked at your circuit again and it looks to me like a DC resonant charging circuit except you are using a transistor instead of a spark gap. Thats an interesting idea, i like it. I wonder if it would work better if you put in a de q-ing diode between the battery and the inductors. Here is a typical DC resonant charging circuit. See the first capacitor after the bridge rectifier, that is basically your battery. If you add the diode it shoud ensure that no current flows back into the battery before the transistor fires.



So it would look like this:



If you want to read some of the theory of the circuit and why im suggesting to try a diode you can read here:
DC Tesla Coil design
Yes i see, I would like to try as many things as I can, one of them being an AC square wave. It doesn't make sense to "not' give it a go. If a function generator is not too expensive I will see if i can get one, I should have one anyway by the sound of it.

I actually already have the de-Q-ing diode, it is the IN5408 diode on the top input rail, although I only just realised that is what it is now..
http://public.bay.livefilestore.com/...001.JPG?psid=1

I do these things from intuition but I don't really know why. However for the desulfator it was a bad idea because the return from the charge battery can't get back to the source battery, that is why my 470 uf cap across the rails blew up like a balloon.

I decided to try this method to get some good effect without a spark gap. I imagine that if I use a higher frequency then i will need to use a smaller inductor and cap and vice-versa.

I have a small 6800 pf cap in parallel with the variable cap. which is 40pf to 1300pf, and this seems to work very well as an adjustment window for a 320uH inductor at 50 Khz. But that will all go out the window when i get more frequency.

I wrapped the remaining cylinder above the resonator coil with aluminum to increase the capacitance of the top load and it seems to be better but the foil has edges and there is radiative losses on the foil now as well as the coil.

None of which is really important, until i get resonance I will not know what radiate's what. I think the best option would be an aluminium tube flared at the end and slotted which can be slid over the PVC pipe above the resonator coil, this is where the resonator coil should be attached the top of metal tube then supports the top load. The more the EM wave radiation that is suppressed the better.

The rain is easing so after I mop up some water I'll try to make some neat bases.

Cheers
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Old 06-11-2011, 11:54 PM
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Quote:
Originally Posted by kapierenundkopieren View Post
Hi Guys! I'm interested in replicating the wireless power transmission, but i have no function generator or even a oscilloscope. Right now i'm searching for a variable 4MHz to 10MHz square wave generator schematic that would fit in, or any other oscillator that would work for this project. I was looking here: Square Wave Generator
Does anyone know if this is suitable for such frequencies?
Also, could someone more experienced than me draw a schematic for let's say a 10W or 20W output?
Or can i get any advice about this idea like what transistor to use on the output of the oscillator?

Thx in advance!

Dann
Hi Dann, I am waiting for some parts to arrive, I have some SG3525 chips coming that should work well, and will drive a mosfet directly or through a Mosfet driver, they are only capable of 0.4 Mhz though. When they arrive I will be designing a dedicated circuit for this which will have the option of an AC square wave or maybe 2 x 0.4 Mhz of DC pulses alternately which will be 0.8 Mhz I hope. If the chips do not arrive when I am ready, I will use the TL494 chips I have already.

The circuit will be PW and frequency adjustable with alternating pulses which can be utilised for driving a tranformer to make AC for a resonant Tank with the primary or the pulses summed to drive a DC resonant Tank for the primary.

I am hoping I can get the current sensing to work, to control the PW dynamically, if it is applicable.

I would prefer to use as simple a circuit as possible like the one I am using now. But simple has it's limits. So my goal is simplicity and effectiveness.

The transistor switch I am using is only rated to 100v it's a IRF540N but it is Neon protected which limits the switch voltage to about 80 volts. The circuit itself is only rated to 18 volts input but the coil can be supplied with up to 50 volts. The SG3525 chips can take 40 volts directly, as can the TL494.

As Cody said though the driving circuit can be anything really, the important thing is to wind the two transmitter/receivers well and this is the difficult part. Winding the coils require's patience and forethought so as not to end up with a big bunch of tangled wire. Some bee's wax is very usefull to make the winding surface tacky and to hold the windings for a rest. I wind all my coils by hand. I only made the surface tacky with wax for the first inch or so of the HV resonator coil former, when the first inch or so is wound the rest is easy to deal with. Make sure if you use wax that there are no big lumps or bumps just a thin smear, too much and it will end up on the outside of the coil and it won't be shiny and pretty.

I can provide the dimentions I wound mine to and the coil heights and stuff if needed but these things are never really final untill the last.

I have a feeling that big tall resonator coils "B" are not really necessary if the required capacitance could be acheived to lower the resonant frequency to below 500Khz. The peak voltage at my receiver output is about 5 to 6 x the input voltage. With bigger resonators it would be more. The higher the voltage the more reduction is needed at the receiver, but higher voltage will run different stuff. It is all relative to our needs or wants I think.

Cheers
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Old 06-12-2011, 12:41 AM
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DC Tesla Coil Design Link

Hi Cody, that link here you gave is very good, thank you for that. That explains it very well.
DC Tesla Coil design

I did notice that when I decreased the primary charge cap value too much that the switch got hot, likely because all the magnetic field energy from the charging inductor could not be stored in the cap and so was disapated as heat. However in my setup this now overflows through the choke which is in series with the charge battery and back to the source battery that way. I think another kind of resonance can be acheived this way if Identical batteries are used. I cannot quantify or validate that statement though.

That make's complete sense now. If the tank cap is too big the voltage will not double. This is a competely awesome situation of course and is one way to use the dead time to our advantage. Now I need to find a way to discharge two primary tank circuits through the one primary alternately, for double frequency, double voltage and quadruple power.

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Last edited by Farmhand; 06-12-2011 at 12:46 AM.
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Old 06-12-2011, 03:59 AM
Farmhand Farmhand is offline
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OK so this is the circuit I am using now to excite the transmitter.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I think i drew it correctly, maybe Cody could check it for me. The small cap I added to the variable cap is marked 682 so I think that is 6800pf and the variable cap is 40 to 1300 pf. I will get an acurate frequency and PW measurement, when I can, the switching waveform is very poor with the mosfet driver i have on this board there are resistors on the mosfet gate. So this could work much better with vertical switching waveforms. The switch trace is so bad there is not even one straight edge to it. This mosfet has been abused badly. I'll try the other fet. then add a turn off sharpener for now instead of the resistors.

It should look like this, But it doesn't.
http://koynpq.bay.livefilestore.com/...003.JPG?psid=1





Cheers
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Old 06-12-2011, 05:00 AM
cody cody is offline
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Ok I see what you are doing with the recovery battery now. Thats a good idea. Im wondering if you might be able to get rid of the recovery and use something like a neon bulb across the transistor like a spark gap. That way instead of the field collapsing into the battery it would resonate within the tank across the spark gap after the transistor shuts off. Just a though, but may not work as well as what you have already. Be careful if you experiment with that idea, you might blow your transistor.

If we simply knew what the resonant frequency of your secondaries is we could easily calculate what the capacitance should be on you variable capacitor to be in tune.

Im not sure what your waveform is looking but most likely your transistor is putting out a square wave. However once you hook it up to the coil its not going to look like one, depending on where you have the scope hooked up. When in tune, when using square waves, across the coil the scope will see a perfect sine wave.
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Old 06-12-2011, 05:07 AM
cody cody is offline
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Hey, try hooking up your scope across the capacitor in you circuit. See how high of a voltage its getting as your adjusting things.
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Old 06-12-2011, 06:13 AM
Farmhand Farmhand is offline
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Quote:
Originally Posted by cody View Post
Hey, try hooking up your scope across the capacitor in you circuit. See how high of a voltage its getting as your adjusting things.
OK no probs. Ahah ! Obviously this is my problem.

100 volts per division.
http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

10 volts per division.
http://wv0v9q.bay.livefilestore.com/...002.JPG?psid=1

It appears as though the fist charge is missed and the second is hit TDC I don't know. indicated by the squigly top to the second oscilation.

What is you're evaluation of them.

Any way it gets originally charged to over 100 volts somehow or something it is a bit strange.



My de-Q-ing diode must be brned out from previous high current episode's.


..
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Old 06-12-2011, 06:23 AM
Farmhand Farmhand is offline
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And this is without the second battery. Not much changes when I adjust the cap except a small drop in amplitude with more capacitance.

http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I see so when the primary is in resonance the cap waveform will be all big one's. Awesome. looks like i gotta hit 250 Khz for that about, that is do-able.

Cheers

P.S. diode is OK.
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Old 06-12-2011, 11:25 PM
Farmhand Farmhand is offline
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40 volt primary cap charge ?

Hi Cody, I have four new cap charge waveforms can you tell me if any of them is heading in the right direction.

Cap charge -1
http://public.bay.livefilestore.com/...001.JPG?psid=1

Cap charge - 2
http://public.bay.livefilestore.com/...001.JPG?psid=1

Cap charge - 3
http://public.bay.livefilestore.com/...002.JPG?psid=1

Cap charge - 4
http://public.bay.livefilestore.com/...003.JPG?psid=1

So this is where I'm at so far, I made a base for the receiver and moved it 10 or 12 feet from the transmitter, it seems to work much the same as when next to the other one but an actual ground connection shared between them seems to drain the power.

With all of those cap charge's I get between 40 to 70 volts on the receiver output but the frequency is different.. The LED lights quite brightly and I managed to find another 5mm white LED, but it blew too so I still only have one working white LED, it must be a good one.

Cheers
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Old 06-13-2011, 01:32 PM
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MonsieurM MonsieurM is offline
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I know some of you don't have and are looking to buy an affordable oscilloscope, I found this, it actually is an oscilloscope/function generator:

VELLEMAN Sa PCSGU250 USB PC Oscilloscope with Function Generator



I hope you find this useful

ps: Farmhand, the set up is looking good
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Old 06-13-2011, 01:51 PM
Farmhand Farmhand is offline
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Alrighty I been playin around and I get pretty good results with a bigger cap on the primary charging circuit, i'm using 0.47uf now and that work's good for lower frequencies up to about 18Khz with 6.6us ( more like 8us ). It uses about 170 Ma to 200 Ma but when a load is applied to the receiver the input current rises a bit and if I light a couple of neons on the transmitter top the input rises a bit more but the LED on the receiver stays lit even if I touch the toroids for a while. I can only drop the voltage to 35 volts or so now by touching the top, then it starts rising slowly charging me up.

Here is some piccies.

This is the pulse to the mosfet gate.
http://public.bay.livefilestore.com/...003.JPG?psid=1

http://public.bay.livefilestore.com/...004.JPG?psid=1

I glued three of these caps together and soldered them in series to get different values to try.
http://public.bay.livefilestore.com/...005.JPG?psid=1

This is the cap charge, frequency reading too.
http://public.bay.livefilestore.com/...002.JPG?psid=1

Dodgy old circuit i'm using and the recovery choke.
http://public.bay.livefilestore.com/...007.JPG?psid=1

This is the charging inductor, i think it is about 110 turns on a 10mm x 40mm iron powder core, a ferrite will work too I think.
http://public.bay.livefilestore.com/...006.JPG?psid=1

And here is the receiver over on the other wall, about 10 feet away is all and I have a wire in place of the ground.
http://public.bay.livefilestore.com/...008.JPG?psid=1

Oh yeah I measured 30 Ma of current flowing through the LED.

And here is the revised circuit as I am using it now.
http://public.bay.livefilestore.com/...001.JPG?psid=1

And a link to some Tesla Autobiography thingy. It's a good read.

Quote:
My Inventions: The Autobiography of Nikola Tesla

Chapter 6—The Magnifying Transmitter
My Inventions - Chapter 6—The Magnifying Transmitter

Cheers

P.S No probs monsieur, thanks for the inspiration, it is very interesting and amazing, it will be fun to start using higher voltage's. I like a bit of a charge up sometime's.
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Last edited by Farmhand; 06-13-2011 at 02:03 PM.
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Old 06-13-2011, 03:13 PM
Farmhand Farmhand is offline
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Well well, now this is wild , it can kinda light CFL's from the transmitter top while just dimming the LED. I didn't expect that. Should be only a couple of hundred volts there. Maybe it's normal. Bit more power and it will work from the receiver too.

touching the side.
http://wv0v9q.bay.livefilestore.com/...003.JPG?psid=1

touching the top
http://wv0v9q.bay.livefilestore.com/...001.JPG?psid=1

I'm impressed, this is still only running from 12 volts at 180 Ma. I could tripple the power input to the transmitter so the cfl would light better and still be using less than half the cfl's rated power consumption it's a 15 watt cfl.

A funny thing happens when the cfl is touched on there. The input cuurent goes down then up and repeats this when I remove it, like surging or backwash.

Cheers
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Old 06-13-2011, 11:46 PM
Farmhand Farmhand is offline
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I have a funny feeling that if I take this transformer and connect one end of the scondary to ground and the other end to an antenna it will also function as a transmitter to a degree, but it only has a 1 - 3 step up. Maybe I'll mess around with that idea later.

http://public.bay.livefilestore.com/...003.JPG?psid=1

Here is a Tesla Screen Saver, it's pretty neat. I can't remember where I got it so it can be downloaded from this link.
tesla.zip - Windows Live

Cheers
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Old 06-15-2011, 05:19 AM
Farmhand Farmhand is offline
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OK I had some better results, for a while before I decided to improve my gate drive ( the IC was damaged ) after getting a nice square drive signal the circuit became very efficient but when i went for more power the mosfet failed. I had to remove the protection neon because it was glowing purple.

I guess I pushed it too far. More abrupt switching caused an awefull lot of voltage at the primary cap with less than 0.3 uf. When I go above 250 Ma on the input everything lights up good but the mosfet gets really hot. I'm trying to work out what I'm doing wrong.

Here is some pics before I screwed the power up and fried the fet.
http://wv0v9q.bay.livefilestore.com/...009.JPG?psid=1

Cfl connected to top and ground.
http://wv0v9q.bay.livefilestore.com/...007.JPG?psid=1

It can light two neons in series by holding one leg and touching the other to the top. It burns my finger after a bit.
http://wv0v9q.bay.livefilestore.com/...013.JPG?psid=1

And it will light up a 5mm LED on the receiver across the room trough a FWBR and 270 Ohm resistor.
http://wv0v9q.bay.livefilestore.com/...015.JPG?psid=1

I have parts and am designing a new circuit to drive the mosfet's, I might try to use two alternately to reduce the stress on them. Not sure yet what I will come up with.

I think the noise from the transmitter affect's the circuit at a certain point and causes erratic behavior and double pulsing, like this.
http://wv0v9q.bay.livefilestore.com/...004.JPG?psid=1

Sketch pad and Breadboard time.

Cheers
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