Testing the TK Tar Baby

[picowatt]

Rosemary,

Thanks for that.  How did you do it?  I tried a copy and paste and that would not work for me.

No, you were not discussing this drawing.  You were discussing a conversation I was having with GL regarding a different drawing with two unlabeled MOSFETs, hence we were referring to them as left and right.

But again, to continue our discussion, if you so desire:

In the drawing that GL graciously provided in reply #732 on page 49 of this thread, and that you also graciously reposted, there is a "supply battery" and a "bias battery".  The bias battery is the battery connected to the 50 ohm resistor at the MOSFET source.

Do you understand and agree that the MOSFET is turned on when the bias battery negative terminal is towards the 50 ohm resistor?  (This is the instance on the left above)

Do you also understand and agree that when the MOSFET is turned on, current flows from the supply battery, thru the load resistor, thru the MOSFET, thru the 50 ohm resistor, through the bias battery, and back to the supply battery?

Do you also understand and agree that when the bias battery positive is towards the 50 ohm resistor the MOSFET is turned off and no current flows?

These are simple yes or no questions and a response with just yes or no answers would greatly facilitate further discussion.

PW

[Rosemary Ainslie]

And picowatt - what Groundloop is suggesting is that the oscillation is simply around the switch.  And what I'm asking is where is that Current Sensing Resistor?  Because if he put that in he'd see that the the voltage across that resistor shows that the current that Groundloop is proposing is dissipated in the 50 Ohm resistance is actually ALSO moving through the battery supply source - in BOTH directions - while the battery is in series with the circuit supply source.

Rosemary

[Rosemary Ainslie]

I find your questions that offensive that I do NOT choose to answer them.  What must any reader think?  That I don't know the difference?  And may I ask you how you could seriously propose that I need to have this explained.


Rosemary

[MileHigh]

This version of the posting #732 drawing may be larger and clearer:

(PW, I just save the drawing to my hard drive and re-upload.)

[picowatt]

Rosemary,

In the drawing that GL graciously provided in reply #732 on page 49 of this thread, and that you also graciously reposted, there is a "supply battery" and a "bias battery".  The bias battery is the battery connected to the 50 ohm resistor at the MOSFET source.

Do you understand and agree that the MOSFET is turned on when the bias battery negative terminal is towards the 50 ohm resistor?  (This is the instance on the left above)

Do you also understand and agree that when the MOSFET is turned on, current flows from the supply battery, thru the load resistor, thru the MOSFET, thru the 50 ohm resistor, through the bias battery, and back to the supply battery?

Do you also understand and agree that when the bias battery positive is towards the 50 ohm resistor the MOSFET is turned off and no current flows?

These are simple yes or no questions and a response with just yes or no answers would greatly facilitate further discussion.

PW