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Author Topic: Rosemary Ainslie Circuit Demonstration, June 1 2013  (Read 219393 times)

TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #120 on: June 10, 2013, 05:41:43 AM »
The next scopeshots I can find are from April 8, 2011, and are the distinctly weird looking ones. And then I skip a bunch, until with SCRN0342 on April 30 2011 we once again see current flowing in the Q1 mosfet at the appropriate time.


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TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #121 on: June 10, 2013, 05:49:51 AM »
Now, consider the dates of these forum posts.

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TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #122 on: June 10, 2013, 06:02:31 AM »
So now what's really weird is that the Q1 mosfet was functional during the March 12 2011 demonstration.... and it was clearly known by them that it would blow if given the opportunity, because as you recall, they started out with 5 batteries, a bit over 60 volts, but actually removed one of these for the second half  "high heat" demonstration leaving only a bit over 48 volts. This, combined with shorter ON times, saved their Q1 mosfet during that demonstration.

So I think we have had several "mosfet blown" events, and I think this is further supported by the new, larger heatsink on the present edition's Q1.
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TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #123 on: June 10, 2013, 06:15:30 AM »
She posted the first posting of the manuscript containing the Figure 3 scopeshot on her blog on March 13, 2012, the day after the demo:

http://newlightondarkenergy.blogspot.com/2011_03_13_archive.html

A remarkable thing since it purports to be a writeup of the demo itself.

OK, that's it for the timeline reconstruction. I think that there is ample evidence in there that shows that Ainslie had trouble with mosfets around the time of the Fig3 scopeshots and afterwards, and that somebody helped her get it up and running for the March 12 demo.... OR PERHAPS the demo didn't actually happen on that date...... and that subsequent to the demo she once again blew some mosfets.
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picowatt

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #124 on: June 10, 2013, 06:41:05 AM »
TK,

Although recently FIG 3 has been referenced to with regard to Q1 not turning on when it should, as discussed in the past, it is actually FIG3, FIG6, and FIG7 in the first paper that demonstrate a Q1 that is not turning on when it should.

PW
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fritz

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #125 on: June 10, 2013, 08:18:43 AM »
Riding a dead horse.
Too much fun.
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TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #126 on: June 10, 2013, 08:57:08 AM »
Quote from: picowatt on June 10, 2013, 06:41:05 AM
TK,

Although recently FIG 3 has been referenced to with regard to Q1 not turning on when it should, as discussed in the past, it is actually FIG3, FIG6, and FIG7 in the first paper that demonstrate a Q1 that is not turning on when it should.

PW

Fig 6 is SCRN0354, made on April 30, and Fig 7 is SCRN0355, made just under an hour later. I'm not sure about these shots the way I am about Fig 3, SCRN0253; I haven't blown them up for careful analysis. These might be showing just barely threshold activation of Q1. The shot SCRN0342, taken about an hour and a half before Fig 6, definitely does show current in the Q1.
Then the record skips, but I have two more shots, SCRN0361 and SCRN0362 from the 8th of May, neither of these show Q1 current but they also omit the gate drive trace altogether so they are not interpretable.

ETA: In any case I am not very concerned about Fig6 and Fig7 because they are taken at a much faster timebase setting than is Fig 3 and are not likely to have been the settings that actually blew the mosfet, especially since they only used 5 batteries. But Figure3, with its 160 second period and 16-17 second ON times, and the six batteries, just might do it. So this is the one I am focussing on and the one I am challenging Ainslie with.
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TinselKoala

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #127 on: June 10, 2013, 09:18:39 AM »
I'm posting this video link again because I think I buried it under the "timeline" reconstruction posts. This vid shows the reproduction of the Fig3 scopetraces much better than the prior one.
http://www.youtube.com/watch?v=nbkpQQvuP2I

I'm tempted to make yet another video where I use all six batteries, the long on time, and monitor the temp of the mosfet until it fails. My supplier charges six dollars for the silly things though.
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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #128 on: June 10, 2013, 04:33:14 PM »
Good job on the video TK. It certainly seems to support the hypothesis that Q1 was blown open or disconnected for the Fig.3 scope shot.

The placement of the FG neg lead does have an effect on the CSR trace, which is why I noted the change on my markup of the setup (attached). I noticed that on the PESN photo there is no gnd lead on the Vbat probe, so I did not show one. I have posed a question to Rose about that and will update it if necessary.

Anyway, this is what I have thus far, awaiting Rose's approval as to its accuracy.
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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #129 on: June 10, 2013, 05:21:26 PM »
Once again, here are two sim scope shots with colors adjusted to match those from Rose's scope shots. The first is with Q1 intact and operating properly, the second is with Q1 removed from the circuit. This is with +/- 14Vp FG drive.

Notice the absence of the inductive kickback spike on the pink trace when Q1 is removed.
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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #130 on: June 10, 2013, 05:41:48 PM »
Here is the schematic I used to simulate the last two scope shots.

Notice that I am now using the proper 50 Ohms for the FG  ;) .

I believe this is the closest I've been able to simulate the circuit. It would appear even more alike if I extended the run times to the time scale as was shown in Fig 3.
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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #131 on: June 10, 2013, 06:14:31 PM »
Here is a Feb 2011 scope shot from Rose that I had annotated with a question; why no current if the SW is ON?

The wave forms are quite close, but I'm not sure why the FG signal appears so poorly formed. Even if Q1 was intact, it is doubtful there is enough Gate drive in this scope shot to turn it ON.
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picowatt

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #132 on: June 10, 2013, 07:06:33 PM »
Quote from: poynt99 on June 10, 2013, 06:14:31 PM
Here is a Feb 2011 scope shot from Rose that I had annotated with a question; why no current if the SW is ON?

The wave forms are quite close, but I'm not sure why the FG signal appears so poorly formed. Even if Q1 was intact, it is doubtful there is enough Gate drive in this scope shot to turn it ON.

.99,

I do not think that this annotated capture is the one I was referring to.  This capture has the wierd "AC coupled looking" FG trace.

I was referring to a capture I believe you annotated of FG3 that marked what the offset numbers referred to (distance from center line), the FG +12Volts, the CSR zero, etc.

It would have been soon after I questoned her about Q1 in FIG3, which would have been March or April (possibly May) after her demo.  If you dig around in your files around that time frame, you might find it.  I can't seem to find the locked RA thread or my posts from that thread, or I would narrow the time down a bit more for you.

Recall at the time that she stated we needed to somehow subtract the "offset" numbers from the displayed data or some such thing, which was why I called LeCroy to confirm that we were indeed reading the scope captures correctly.  Also recall that the LeCroy and the Tek scopes differ with regard to how the offset numbers are used.  I believe the capture you annotated was to allow her to have someone review/confirm the way we were reading the LeCroy captures.   

PW

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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #133 on: June 10, 2013, 07:10:05 PM »
Hi PW.

I recall the figure you were referring to, however that wasn't what I was trying to post there.  ;D

If you really want me to dig that scope shot up, let me know and I will look for it.
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poynt99

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Re: Rosemary Ainslie Circuit Demonstration, June 1 2013
« Reply #134 on: June 10, 2013, 07:12:18 PM »
Ah, is this the one?
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