Testing the TK Tar Baby

[TinselKoala]

Laugh, I think. She is a laughingstock and doesn't even realise it.

Meanwhile, back in the DeepBunker.....

I believe it was PW who most recently pointed out that the input capacitance Ciss of an IRFPG50 mosfet is 2800 picoFarads, according to the data sheet. So four of them in parallel would have a total Ciss of 11,200 picoFarads. That's not chopped liver; rather it is a relatively substantial capacitance.

And of course "everybody" knows, don't they, that capacitors block DC but "allow" AC to pass. At least perhaps they have heard this rumored, even if they didn't believe it. Perhaps they even have a cloudy idea of just what "AC" really is, that prevents them from being able to understand concepts that require a CLEAR understanding of AC currents and the changing voltages from which they arise.

And perhaps some of these people are still in denial about the capabilities and functions of a function generator, or its role in the Ainslie NERD circuit, or the consequences of that role.

Some might consider that the following little video addresses some of these issues, and in fact soundly refutes some contentions, once again, that Ainslie has made about her circuit, about mosfet capacitances, about function generators, about AC power, and about my work.

And some might just bloviate with pages of irrelevancies, seeking to bury this little video under the usual pile of Ainslies.


Capacitors.... How do THEY work ??

http://www.youtube.com/watch?v=H_-5UPbSrv8

[Magluvin]

Rose said,  "Guys - I've yet again been advised to stay away from this thread.  It's really achieving absolutely NOTHING - and I know this.

Well she certainly doesnt listen to her "advisers"  ;]  Why would she listen to the likes of us. And she says she knows it is really achieving absolutely nothing, yet the continued posting shows otherwise. ;] She doesnt even follow what she really knows.


Oh, she must have not used the spell check again, " picoaccrditation"
Has she shown her own "accrditation"'s?  ;]

Mags

[picowatt]

TK,

As you can see from a repeat of my earlier post below, I was generous and only used 2000pF per MOSFET as the gate to source capacitance.  This varies with applied voltage a bit, but 2000pF is probably close to or less than the actual amount.

It is not just 4 MOSFET capacitances in parallel, it is all 5.  Draw two caps onto the NERD circuit.  One is a 2000pF cap between Q1's gate and source.  The second cap is an 8000pF cap (4X2000pF) drawn between Q2's gate and source.

If you now look at the NERD schematic with these two caps drawn in, you will see that both caps are in parallel with the FG terminals, allowing AC current to flow directly to the CSR via the MOSFET capacitances, which total 10,000pF in this instance, and possibly as much as 12.5nF or even a bit more).

As I say below, at 1.5MHz, the reactance of 10nF (10,000pF) is approx. 10 ohms.  So this represents a 10 ohm path for AC currents from the Q2 source directly to the CSR.  The harmonics of the oscillation will, of course, see an even lower impedance path.  The second will see 5 ohms, the third 3.3 ohms, etc.

(If 2.8nF per MOSFET is used, these numbers drop to fundamental=7.5ohms, second=3.8ohms, third=2.5 ohms)

When Q2 is biased on, its DC bias current flows ONLY thru the FG, the CSR and to the battery negative.

AC current, when Q2 is oscillating, flows thru BOTH the FG and thru the MOSFET capacitances, with the MOSFET capacitances being the lower impedance path of the two.  Both paths then flow thru the CSR and to the battery negative.

(The above assumes the FG common is actually connected to the CSR as per the paper's schematic and not to the battery negative)

So, as you can see, there is no mystery at all as to how more AC current is able to flow than one would expect if only the Rgen=50R path is considered.  There are two paths for AC.  The FG AND the MOSFET gate to source capacitances.

Once this is accepted, then Coss must as well be considered.  But that can come later.

PW

(And no, this is not a new position, I stated this way back in the locked thread.  But then, as now, it fell on her deaf ears.) 

And in continuation, again here is her quoted response:

"On the whole I agree with this.  But there's a small distinction.  The function generator can ONLY pass current to and from the plug that powers it.  It can only INDUCE current elsewhere.  The distinction is critical. Our oscillation is able to induce upwards of 8 amps.  There are at LEAST R50 Ohms in series with its probe and terminal.  Therefore. In order to deliver 8 amps the function generator would need to find that energy from a voltage upwards of 400 volts.  Frankly if any function generator delivered even half that amount of energy it would be deemed to be catastrophically compromised and would be sent off for repair.  It's ABSURD to suggest that the function generator is responsible for that level of current flow.  And its absurdity is ever greater as we can only measure a maximum of 6 volts AC from its signal.  Therefore not only is the proposal that the function generator is responsible for this extra energy - theoretically IMPROBABLE - it is also lacking in MEASURABLE EVIDENCE."



Her argument that the FG cannot pass all of the observed AC current is quite sound.  Any DC or AC current flow thru the FG to the CSR will be limited by the 50 ohm resistor in the FG's output path.

But, as I am apparently psychic, I explained the major AC curret path in my reply #3573.

There is approximately 2000 to 2500pF of capacitance between the gate and source of an IRFPG50 MOSFET.  If one looks carefully at the circuit schematic, it will be apparent that all 5 of the MOSFET's gate to source capacitances are electrically connected in parallel and provide a path for AC current flow directly to the CSR.

These 5 parallel gate to source capacitances, totaling 10,000 to 12,500uF (10 to 12.5nF) provide an AC current path directly across the FG's output terminals allowing AC current to bypass the FG.

(If you draw in an 8000pF cap between the source and gate of Q2, and another 2000pF cap betwee the source and gate of Q1, representing the MOSFET gate to source capacitances, this will be more easily visualized in the schematic)

If the oscillation were a pure sine wave, this 10nF or so of capacitance has a reactance at 1.5MHz of approximately 10 ohms.  This means that not only is there an AC/DC path of 50 ohms thru the FG, there is also an AC only path in parallel with the FG output terminals equal to 10 ohms.

So, for AC currents at 1.5MHz (of a pure sine), there is a 50 ohm path in parallel with a 10 ohm path, or approximately an 8 ohm path, from the source of Q2 to the CSR. 

It must be noted that the observed oscillation is not a pure sine.  Although its fundamental may be approximately 1.5MHz, there is a large amount of observed harmonic distortion.  An FFT of the oscillation signal would show that there is a substantial amount of even and odd harmonics present, with the third harmonic likely being the most significant.  These harmonics are higher in frequency than the fundamental (they are, afterall, "harmonics") and to these harmonics, the 10nF effective capacitance across the FG terminals represents a much lower impedance path to the CSR than it does at the fundamental frequency.

Any second harmonic present in the oscillation waveform will see the reactance of the 10nF capacitance across the FG terminals as though it were a 5 ohm resistor.  For any third harmonic present, this path would equate to a 3.3 ohm resistor. 

It should be appreciated, therefore, that although the DC and AC current that can flow thru Q2 and the FG is limited by the FG's internal 50 ohm resistor, the gate to source capacitance of the five MOSFET's, being electrically connected in parallel across the FG output terminals, provides a very significant low impedance path for AC current flow thru Q2 to the CSR.     

[Magluvin]

Somethings odd with her always only providing answers via having to go to here site, when they could simply be posted here.

Probably so she can edit them as she pleases later to CHA.  ;]

Mags

[TinselKoala]

Somethings odd with her always only providing answers via having to go to here site, when they could simply be posted here.

Probably so she can edit them as she pleases later to CHA.  ;]

Mags

She can not only edit and censor, but she has explicitly excluded "some" of us from registering or commenting at all.

Not only that, but her continued posts and links here are also deliberate "Honeytrap" attempts to garner IP addresses and whatever other information can be obtained from your browsers.