Testing the TK Tar Baby

[picowatt]

TK,

Congrats on getting the F43 back together, and working!

I'm a little nervous about the '05.  We'd like to think a 60 volt specified part can handle at least that and a bit more, so hopefully you'll be OK.  You might not want to get too carried away with "wierd" stuff applied at the output while operating the F43 at close to its rail to rail output swing till you get the other parts.  But again, congrats, glad to see she's up and running!

That previous post of yours regarding the "drama" is really something.  After reading a few of the pages you linked to, about all I can do is shake my head.

It seems like arguing with people that may actually know a few things is SOP.  Don't answer questions, just argue that the person asking the question isn't qualified to ask the question.

That "wierd" waveform you posted looks like the gate drive is cap coupled.  Possibly Rgen was cooked open.  Possibly a clip lead or 'scope probe wasn't making contact.  Who knows?  After reading your links, I am not sure we can look at any waveforms and know, with complete confidence, what the schematic is for a given capture.

If we only look at what's in the papers, FIG 5 is the only capture that looks as it should if the schematic in the first paper is referenced, and that was from 2-11 I believe. 

It seems this whole affair has quite the history...

PW 

[picowatt]

TK,

I would still consider adding the diodes we discussed to the F43.  They may already be in there somewhere, but without the schematic, who knows.  Adding a pair will hurt nothing and maybe save the outputs someday.  Give it some consideration.

PW

[TinselKoala]

@pw: thanks for your advice re the F43: I'll be taking it, don't worry. I'm going to wait until a schematic arrives before I put diode inside, but if I use it on an operating Tesla coil again I'll use external protections. And the 80 volt transistors will go in as soon as they arrive. Meanwhile it's fine for the Ainslie/Tar Baby stuff and for tuning non-operating coil sets. I have an interesting new wireless power transmission project that I'm working on right now, using irfz44n mosfets in a high-power RF oscillator that will have very good transmission efficiency in the near field. And I've picked up a handful of irfp450s for the groundloop H-bridge and the ClassE sstc.

As far as the NERD circuit and the schematics...

Well. Ainslie has even admitted (? or claimed ?) that she knew about the Q1-Q2 separation before .99 pointed it out, and withheld the information for some reason or another. If this is true.... that she knew that the 5 were not in strict parallel before April 19 when .99 posted the real schematic description of what was in the video.....and carried on all that discussion during the month between the demo and the discovery.... well.

If she DID know and withheld the info, that's one thing.
And if she DIDN'T know and didn't find out until .99 showed her... yet claimed she DID know... that's another thing.
They both involve lying and incompetency, though.

Either way, though, when the gate signal goes +12 volts, or even much over 4 volts positive, the mosfet(s) getting that will either turn on and conduct current... or they are blown or missing or miswired.

[picowatt]

TK,

So you were able to locate a schematic for the F43?  I looked quite a bit, couldn't even find a not for free one for you!

PW

[MileHigh]

TK:

Indeed, protection diodes attached to each supply rail would be a very good idea. Perhaps two or even three in parallel since you have the "kooky" negative oscillation mode to deal with.

Like a giant CMOS circuit.

And to think that the whole team wasn't even aware.

Confession time:  How many multimeters have you blown because you weren't thinking and you went from measuring current to measuring voltage?  I have probably blown about three.  It was all so long ago I can't remember any details.  I suppose with a good multimeter you just blow a fuse.  But I have officially killed a few multimeters way back when.

Then there is another goof that makes you jump.  Sometimes when you are doing your mad scientist projects you use ribbon cable.  You run power and signals through the ribbon cable.  You short out the power and you know that's not going to phase your power supply.  In less than a second two conductors in your ribbon cable are smokin' and you see a quick red glow and then poof! and it's all over.  You are left with a ribbon cable with two scorch marks running down it and burnt insulation.

Are these universal truths?   

MileHigh