Here is a scope shot of both... channel 1 between drain & source and channel 2 between gate and source.

I also switched the probes and software to X10 and now it hardly affects the current this way.

Luc

See scope shot above ... it's at 8.59v RMS

Luc

Geat Still can go a little bit down, then you will probably hit the threshold of the mosfet. Tough possible can solve it again with magnet position

End for today. Late again.

--
NextGen67

@gotoluc

I like this composite waveform...it's nice and placid. The toroid coil
is constant running at resonant pure sinewave f and is pumped by the
gate at resonating 2f damped at 50% oscillation.

It might be interesting to try to boost the gate to 4f.

:S:MarkSCoffman

Hi Mark,

I have no schooling in electronics or even regular school for that matter. What I know at this time was learned by trial and error. So unfortunately I don't know what the term 2f and 4f means.

If you care to explain more I may get it ... or not

Thanks

Luc

2F and 4F refer to harmonics of the main frequency.  For example, the 2F harmonic of 60Hz is 120Hz, and the 4F harmonic would be 240Hz.  Square waves, or other non sinusoidal waves, can be considered to be the sum of a fundamental frequency plus harmonics. Spectrum analyzers give you this kind of view, breaking up a complex wave into it's component frequencies.

Thanks derricka for taking the time to explain what that term means.

Luc

YES YES YES Parametric resonance !
When we combine it with some kinds of amplifiers we will have OU.

FWI

I've copied this from the energetic forum so you can be updated as to what point I am at this time.

Luc

Hi luc,
First off, genious resonator!  Thanks for trying the cap.  Ive run some math to help maybe.  Im not sure what your inductance in the last test is but im assuming its 200mH.  If thats the case than with the 0.002uf capacitor, the resonant frequancy of the coil should be 7957 Hz.  I find it odd that the calculated frequency of your coil is so far off from the frequency that you have been using :thinking: I wonder if the coils special winding plays a role in that.  Either way this may suggest that the tuning can get better.  You should be able to tune the frequency by putting a potentiometer in series with your oscilating inductor or using a magnet to tune that core.  But i might be wrong, its such a new oscilator, im still trying to wrap my brain around it.   I have figured out where some of your losses have come from by adding the capacitor.  In the tank circuit you now have introduced a circulating current, this current is much larger than the current you are putting into the tank.  We can use ohms law to determin the current. 

V=10.94V rms
R=6.7 ohms (coil resistance)
I=V/R
I=10.94/6.7

I=1.63 amps

Your at a low enough frequency that we dont have to worry about skin effect but your 30 awg wire is not capable of pushing 1.63A.  Maximum amps for power transmission of 30 awg is 0.142A.  So your wasting energy in heat. We can easily correct that be changing the value of the voltage. We can use ohms law again to calculate the maximum voltage you can use in that particular setup.

I=0.142A
R=6.7(coil resistance)
V=IR
V=0.142(6.7)

V=0.95 volts

If you take a temperature reading of your current setup running off 12V you should find that the coil is heating up, and dont forget the capacitor too.  It must be able to withstand the amperage as well.  If it heats up you can use multiple caps in parallel of lesser value to add up to the desired capacitance and give a higher amp capability.  And all wires between coil and cap must be able to handle the power as well.  So if you are pushing your toroid over 0.95 volts, than you are wasting energy in heat.  Please correct me if i have something wrong here.

Hi Cody.

thanks for your interest and help also

The inductance of the toroid coil (with magnets and air gap) in test 13 video is around 26mH + - 1mH

As for the oscillation inductor connected between gate and source. After a full day of playing with this, it seems there is no need for a resistor and the resistance of the inductor does not seem to matter. It's all about Inductance

At this time I'm playing with the circuit and will give you the details of the toroid coils. I say coils because I wound a quick one layer toroid as the mosfet pulse inductor.

The mosfet is a 2SK2806-01
Battery voltage is 12.88vdc
Main Toroid is 6.95 Ohms DC
Its Inductance is 117mH (with magnets)
Pulse Toroid is 0.097 Ohms DC
Its Inductance is 19mH

So using the 2SK2806-01 mosfet which needs min. 2v to trigger the above Pulse inductor specs will do it as long as the input voltage is 12.88vdc and the the main pulse coil inductance is 117mH. The result of this combination will be a sine wave Resonance at 14KHz.

Lower the main coil inductance and you will need to also lower the pulse inductor and the result will be a higher Resonance frequency.

Maybe a formula could be established that one could just input mosfet minimum gate trigger voltage, main coil inductance and source voltage, then it would give you the pulse coil inductance needed and also tell you the resonating frequency. I think this would be possible.

There is no need for the pulse inductor coil to be a toroid. I used one to see if I can find any advantages and see if less resistance used less power. So far I can't see any advantages.

Cody, can you please look this over and recommend the best voltage and frequency I should be using and I could re-tune to see if I can find any advantages. So far the lowest I could get the current down just before the circuit stops pulsing because of not enough pulse voltage produced (at gate) is 30uA @ 12.88vdc. The frequency range I tested is 30KHz down to 14KHz and all are about the same 30uA results.

Thanks for your help and time.

Luc

ADDED

Link to MOSFET pdf:  http://www.skory.gylcomp.hu/alkatresz/2sk2806.pdf

Hi Gyula,

I have some questions about this toroid winding and connection technique I found and originally used this same toroid on my ORBO replication. BTW, this toroid coil gave me the best results on the ORBO. More Inductance with less windings = Less Resistance and more winding space for extra layers.

Here are my questions:

1. wouldn't using a toroid and this winding technique not have a benefit in a electric motor?

2. does more Inductance not give a stronger magnetic field?

3. does more Inductance cost more energy than a lower Inductance coil?

Always grateful for your help

Luc

Hi Luc,

1) it depends what you mean on electric motor, sorry.  in conventional motors a toroid with its closed magnetic path is normally not considered but if an inventor finds ways for applying it in a novel way: in ORBO the toroidal coil is used for 'shielding' the core from a magnet by way of saturation, as so far it is found

2) yes, more inductance gives a stronger magnetic field

3) it is a complex question, I do not know a strait yes or no but maybe it does.    The time constant L/R increases for sure, this means higher inductive impedance to resist current and if you want a quicker current response you have to increase input voltage to force higher current --> this involves higher input power.
MAybe other members here could comment some more on these.

rgds,  Gyula