Testing the TK Tar Baby

[TinselKoala]

A short simple quiz. This "should" be for RA but since I know she won't take it seriously or cooperatively I'm opening it to anyone who might still give a flying blimp. Maybe something will sink in by osmosis, if it even makes it as far as her eyeballs.

Consider the diagrams below. I have simply removed the Q1 part of the circuit since it is not involved at all when the FG or other source is sending a negative signal to the sources of Q2 and a positive signal to the gates.
Right so far?

The blue oval represents the FG where it is hooked into the circuit. I have taken out the FG and put in a simple battery and switch, with the appropriate battery polarity. This is equivalent to the FG set to make a long, negative 5 volt pulse, just waiting for the switch to be closed. And it is equivalent to what we have been using for two weeks now in Tar Baby to make oscillations and negative mean power products.
Right so far?

I've indicated where a voltmeter can be placed, with the green wires. And I've indicated where 2 "perfect" ammeters can be placed, with grey circles.

In the first diagram I have also disconnected the load and in the second diagram it is in its normal place.


Now... for the first diagram, close the switch and observe what happens. This is equivalent to the FG coming to the end of the "off" portion of the long duty cycle and turning "on", but with no load in place.

1. What does the voltmeter indicate?
  a) nothing, zero volts
  b) about 72 volts
  c) about 5 volts
  d) about 77 volts
  e) some other voltage very different from b, c, or d

2. Does the ammeter A1 indicate anything, and if so, what?
  a) no, nothing
  b) yes, constant current flow
  c) a brief small surge, then nothing
  d) oscillations around the zero current line
  e) oscillations around a line of constant DC current flow

3. Does the ammeter A2 indicate anything, and if so, what?
  a) no, nothing
  b) yes, constant current flow
  c) a brief small surge, then nothing
  d) oscillations around the zero current line
  e) oscillations around a line of constant DC current flow

EXTRA CREDIT: What would a voltmeter read hooked directly across where the load goes?

Now, the same questions with respect to the second diagram, with the load in place. Close the switch and observe what happens.

4. What does the voltmeter indicate?
   a) nothing, zero volts
   b) about 72 volts
   c) about 5 volts
   d) about 77 volts
   e) some other voltage very different from b, c, or d

5. Does the ammeter A1 indicate anything, and if so, what?
   a) no, nothing
   b) yes, constant current flow
   c) a brief small surge, then nothing
   d) oscillations around the zero current line
   e) oscillations around a line of constant DC current flow

6. Does the ammeter A2 indicate anything, and if so, what?
   a) no, nothing
   b) yes, constant current flow
   c) a brief small surge, then nothing
   d) oscillations around the zero current line
   e) oscillations around a line of constant DC current flow

EXTRA CREDIT: What would a voltmeter read hooked directly across the load?

"They are just questions, Leon. They are written down for me."

[Rosemary Ainslie]

Guys - TK is now proposing that there's yet another circuit.

Is there yet a different schematic, other than the one below, being used??

Or is Rosemary simply talking out of her head again, making things up and contradicting herself yet once more?

Or - as he 'spins' it I'm talking out of my head?  Where else?  That I'm making things up?  That there's some contradiction?

Please note carefully where the Source leg of Q2 goes.  It ONLY goes to the function generator.  It does NOT, most assuredly - go to the negative or source rail of the battery supply.  It is floating.  It has always been floating.  This has NEVER varied.

Kindest regards,
Rosemary

[TinselKoala]

IT IS NOT FLOATING. The FG has an internal impedance of FIFTY OHMS. The sources of Q2 are connected to the battery negative through this 50 ohm impedance and the CVR. Most assuredly.

[TinselKoala]

If we only had the schematic diagram for the ISOTECH GFG324.... even you could see the connection.

But unfortunately we only have the schematic diagram for the INSTEK GFG8216a that was used by you in the DEMO VIDEO.... and it shows this connection internally very clearly, to those who can read a schematic.

You are once again wrong in your assertion and easily refuted by FACTS and EXPERIMENT.

Please note carefully the FUNCTION GENERATOR listed below.
What is it? A misprint, a typo, , an error..... or something common that we can find on the internet?

You have zero credibility left here, woman.

[Rosemary Ainslie]

IT IS NOT FLOATING. The FG has an internal impedance of FIFTY OHMS. The sources of Q2 are connected to the battery negative through this 50 ohm impedance and the CVR. Most assuredly.

Guys,
TK has just argued our point by showing that the Q2 Source leg is floating.  Now he needs to argue is own argument.  Somehow.  Because what he needs to prove is that the flow of current from the battery can now move through the function generator itself.  Through those probes.  And then the voltage would need to be greater than zero.  Not less than zero - which is evident in this phase of the oscillation.  It is an IMPOSSIBLE argument because the waveform evidence belies it.

Kindest as ever,
Rosemary

Bear in mind that the Source leg at Q2 is CLEARLY not connected to the current sensing resistor as picowatt claims.  And bear in mind that if there is a connection between the Gate of Q2 and the source leg of Q1 - then it would simply discharge current in from the battery in exactly the same way as it does when the Gate at Q1 is positively charged.  Because the Gate at Q2 is most assuredly positively charged during the 'off' period of the switching cycle.