Testing the TK Tar Baby

[fuzzytomcat]

Humm .... kinda fuzzy .... hehehe

The date appears to be  4 APR 2012 ..... a older Tektronix DPO 4034 ..... me thinks 

Ok ..... there appears to be a new video called "Electric OU: Tek DPO meets Tar Baby for a PlayDate"

TinselKoala Channel -
http://www.youtube.com/watch?list=UUZFlznLV3IyePfbc2TfDetA&feature=player_detailpage&v=NevE0FqoRKA

FTC

[TinselKoala]

Oh, what a tangled web she weaves, when she practices to deceive.

Now that Ainslie has tried to disavow the Demo Video that she posted on 22 March 2011, saying that it does NOT represent her claims or even her circuit...... the waters have been muddied yet again. There is indeed a subtle difference, with at least one significant effect, between the circuit that we have been using all this time in our sims and our hardware, and the circuit in the paper. See the diagrams I attach below. The blue border one is from the paper, the plain one is the one that we have been discussing... WITHOUT CORRECTION FROM RA .... and which is the one shown in the video HARDWARE, not the video "stated diagram" which only shows a single mosfet.

Deliberate concealment? Why didn't she point out this subtle difference when the plain-border diagram was being used in simulators and replicators all over the world, and discussed many times in the NERD thread?

Regardless of all that, Tar Baby can easily be converted to the "new" circuit from the paper, and it's a good idea too, because it will then share the heavy current between the Gang of Four during the high heat mode. As far as the various analyses done by everybody, I think only the current flow per mosfet and power dissipation estimates need be revised. I think that except for mosfet heating, all the other circuit behaviour should be the same. Perhaps a bit of difference in the oscillation frequency.

I'll try to test this in Tar Baby later today, but Real Life intrudes and I have other commitments this afternoon so I may not get to it.

[MileHigh]

TK:

More silly mass confusion.  I am under the impression that Rosemary has always gone glazed-eyed when it comes to schematic diagrams and she has been relying on her associates to draw them up.  So this could be a generic RAT problem.

I am curious enough now to go look at the video.  I will be looking for evidence that the common ground point is between the battery negative terminal and the current sensing resistor.  i.e.; in the same configuration as the marked-up schematic diagram that I have been posting.

If I can find confirmation of this I will be listing the timings where the frames show this in the video clip. That will be the smoking gun that shows that the current sensing resistor is in the wrong place and she is recording garbage data.

MileHigh

[TinselKoala]

@MH: I think that what you are looking for is contained in these two screengrabs from the video. But by all means examine that video carefully, with liberal use of pause and rewind, and also listen carefully to the audio, both for what is said and the background sounds.

The top picture is the bottom view; all you have to do is mentally turn it over from right to left, like turning the page of a book.

The FG "positive" is the red alligator clip in the top view; it looks to me like all scopes and the FG are grounded to the same 4 points, which are all connected on the bottom side to make a ground bus, and this is connected to the black battery lead in the top right of the backside view at the place marked "source" with two arrows. (The labelling is nonsensical and distracting.) And the other end of this bus goes to the CVR via the two black wires at lower right, one of which goes to the "5th" resistor, the other end of which doesn't seem to be connected on the topside or the bottom. And the other end of the CVR stack goes to the place marked "source" at the lone mosfet spot, which does appear connected to the source of that mosfet. Unfortunately this is also connected to the "lower" of the threaded rods that connect to the Gang of Four.... which on the topside view can be seen to be connected to the gates of this array by the red cliplead wiring. The mosfets are mounted correctly on the heatsinks, that is, number side out, so the leftmost pin is the gate, looking at it with pins down and numbers facing you.

[TinselKoala]

I just noticed that the "pegboard" appears to have 19 x 19 holes. I wonder if she appropriated somebody's nice GO board !!

(Sorry, miscount... it's only 14 holes vertically but 19 holes across. Is it a piece of ceiling tile? It's pretty thick for pegboard. I do want to get my non-replication right, you know.)