Testing the TK Tar Baby

[picowatt]

You know she can't answer. She does not even comprehend the question.

She has never even checked on the applied signal voltage, because she didn't consider it relevant.

What do you make of that, then, picowatt? I certainly see it as further proof that she is an ignoramus, willfully ignorant and can neither read nor discuss schematics coherently, much less oscilloscope traces. She still has no conception of the linear conductance region of a mosfet's operation. She still believes that DC current flows across the mosfet gate, and that the drain-source channel is either at 0 ohms (sic) or that it's open, "disconnected" and cannot pass any current whatsoever, AC or DC. 

What, I wonder ... does Ainslie think the blue trace represents in all of her scopeshots?
Is there some _other_ applied signal voltage to be considered in the Ainslie apparatus? I don't think so.

TK,

Yep, if I was going to go looking for 160ma or so of bias current, I wouldn't waste my time looking for 40millivolts at the 0R25 CSR, when the voltage drop across the FG's 50R provides a way more sensitive point to view the bias current.

Of course, one would need to know the FG output "open circuit" voltage and then subtract the FG output "in circuit" voltage and divide the result by 50, but hey, that's why they make calculators.

You would have thought someone would have noticed that no matter how far negative the FG offset was adjusted, the voltage at the Q2 source always hovered at around -4 volts.  And then asked themselves why...

But, I digress, why is Q1 not functioning as per the schematic in FIG3, 6, and 7?

Sadly, back in the locked thread, I even hinted at a possible response and direction she could take that would allow her to save face, but she was on the attack at the time and did not even grasp what was being suggested.

PW

[TinselKoala]

Just completed SN002, first light, burning in, testing a different capacitor set. I only have one more set of the orange drops and my supplier can't seem to get any more.

I also have another alternative... he has some more of the poly silver rolls like I used in the prototype, which work quite well but are bulky.

I have a nice layout worked out for these pad-per-hole circuit boards that is easy to do, and the boards are available at Radio Shack and elsewhere, so the hurdle of making a PC board isn't necessary for a neat layout any more.

[picowatt]

Just completed SN002, first light, burning in, testing a different capacitor set. I only have one more set of the orange drops and my supplier can't seem to get any more.

I also have another alternative... he has some more of the poly silver rolls like I used in the prototype, which work quite well but are bulky.

I have a nice layout worked out for these pad-per-hole circuit boards that is easy to do, and the boards are available at Radio Shack and elsewhere, so the hurdle of making a PC board isn't necessary for a neat layout any more.

TK,

What's the value/voltage on those caps?  What's the total C you're going for?

PW

[TinselKoala]

Total desired capacitance is around 60 - 70 nF.

Those are 5.6 nF each, x 11, but they are only rated 250 V so they may not hold up.
The current from reactive power circulating in the loop/caps is incredibly large.

The orange drops in SN001 are 6.8 nF 600 V each, x 9, and the silver poly rolls in the prototype are 10 nF each, 500 V, x 6.

[TinselKoala]

The schematic again:

-tested to 18 V input, 7 amps draw from supply
-suggest fusing at 7.5 amps
-could go higher with adequate caps and heatsinks and forced cooling
-have not yet blown a mosfet