Quantum Energy Generator (QEG) Open Sourced (by HopeGirl)

[Farmhand]

Unless you have differential probes, you need to consider what you will use for your instrument common during your measurements.  You need to include consideration for whether or not your instrument common will also be a power supply common due to the green safety lead.

The logical place for a CSR is betwen the MOSFET source, and the rest of the circuit common that feeds the 100uF cap, pulse generator and MOSFET driver.

I do not see anything to limit the flyback voltage of your 10uH coil.  Is it coupled to the left hand coil?  If it isn't, then you need to think about how you would prefer to protect the MOSFET drain.

No Mark the flyback is taken care of, the coil discharges into the 20 nF cap across the switch then reflects back to the
supply capacitor. It can run all by itself with no loads.  That's why I get a 40 + volt lump from a 12.5 volt supply. 

I would almost bet me leftie that the primary has a sine wave on it or close to a sine wave.

The CSR between the mosfet source and circuit ground will only give the current through the mosfet and not the coil discharge
current. Only a CSR between the coil and the mosfet drain will track the current through the coil and back I think, not sure about
how to get both the voltage across the coil and the current through and back from the 20 nF capacitor. 20 nF in series with 330 uF
is not much different to 20 nF itself.

The green safety lead to my tanks you mean ? They are isolated from the supply circuit by 15 to 20 mm at the least. And I think
the DC output of the Power supply is isolated. I could use a good battery as a supply do take the measurements, if I let it run for
some time the battery voltage will stabilize pretty much and I can re-tune.

I can just remove the green safety lead to take measurements on the tanks. But it makes no real difference, I don't think.

I might just add some timing capacitance to the plse generator so I can widen the pulse width a bit to begin with, and add a
FR302 diode to the input + rail from the supply.

..

[Farmhand]

Here's some shots of the Drain not loaded by the resonant tanks (with the tanks de-tuned the input is almost the same as when
there is no coil at all near it), and the input is minimal, when I put a tanked coil near the primary and tune the tanked coil the input
power to the primary increases to power the tanks, and-or the load. Depending on the tuning of the coupled tank.

When the primary is loaded by the tanks alone and there is no actual load the drain voltage rises rather than falls, but
input current increases of course. So there is input current and there is primary coil current, different measurements.

The shape of the DC lump trace on the drain shows the voltage rising due to the flyback charging the 20 nF capacitor across
the switch, then the voltage declining as the 20 nF capacitor discharges back through the coil to the circuit capacitor on the
supply positive rail. And I think that results in an almost sine wave or even a true sine wave across the primary, but that
won't be seen scoping the drain of the mosfet.
..
Of course many of the "unguided" might call that OU if the seen it. hahahaa

[Farmhand]

I guess if the DC power supply is isolated then I can just connect the negative end of the primary coil (mosfet drain) to the same
ground as everything else. Then all coils are grounded to the same point, and I can disconnect the ground connection from my
ground stake, but then the scope will be the ground, I won;t be using any elevated antenna : )

So is that OK ? Or what should I do to be able to measure the primary coil voltage and current together ? Not the current through
the mosfet or the input current but the oscillating current in the primary coil. Ground it's negative (Drain) end I think is the way.

The DC circuit ground would then swing negative isolated wouldn't it ?

Then I can then isolate it if I want to measure the gate or Drain wave forms. I think.

I'll modify the drawing, I think I have the entire thing final, except for accurate component values, I will need to re measure
anything that I want to get accurate as far as components like the tunign coils and actual capacitor values ect.

..

P.S. If I just use a DMM on the battery voltage and return current that will work, or I could use and Isolated scope, or change the
primary circuit ground to scope the drain and gate. Or scope them backwards. 

And I tested my DC power supply, neither the positive nor the negative of the power supply set to 12.5 volts causes any currents
to the scope ground or to my ground, there is a DC off set between the scope (house ground and my ground of a few mV.

Can I use a 270 or 540 Ohm resistor there to make sure that my ground does not affect the measurements while keeping
my ground connected ? Just while I do the measurements on everything ? Or any suggestions ?
.
..

Oh dear ! But it does cause currents if I try to connect the scope ground to the drain of the mosfet ! I used a resistor to test . 

[Kamil]

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[Farmhand]

Here's my drain wave form using the positive rail as the scope ground. Doing so caused no change in the power supply current.
Funnily if I scope betwenn the positive rail and the negative rail I get hardly anything and no change to the power supply current.
But if I try to connect the scope ground to the mosfet drain then the power supply current will change.

Not a sine wave but it wants to be one.  ..