Testing the TK Tar Baby

[picowatt]

Except for the jokes, don't I always mention these in the videos and the scope shots I post? As I said before I don't always mention the timebase, since RA's are all over the place and the pulsation frequency doesn't seem to matter and we know that my oscs are around 2 MHz. But the other parameters.... well, I do try. If you point out one where I forgot to do so,  but the information is pertinent, please let me know and I'l "fill in the blanks". Technically yes, but the pot is fried and needs to be all the way against the stop to get out of the burned spot, so the PS voltage setting is doing the regulation. And these are also including the 50R in series as well. As I indicated earlier, I think that the Elenco has started putting some fuzz on the power it's putting out, or perhaps a mosfet is starting to go bad, because the waveforms I'm getting since yesterday have seemed different, with more HF components. Uh-huh. And her trace is presumably coming from the function generator signalling the circuit to switch, whereas my trace is coming from a DC bias supply held constantly on; and there is also the fact that the bandwidth of the HP180 is under 100 MHz, especially with the probes I've got.

Your second-to-last sentence confuses me. Are you saying that "my" traces are different than the RA CH3 traces Fig4 and Fig5, or are you saying that Fig4 and Fig5 are different from each other?
Of course they are different from each other.... one is at 1 microsecond per division horizontally showing the oscillation region only (note the trigger time offset at the top: the yellow triangle pointing off screen left and the -5.0000 MilliSecond figure at the top) and the other is showing the pulsations at a much longer timebase setting of 500 microseconds per division with no trigger time offset. In the FIG 4 we are looking at only that part of the oscillation that is represented by the blue fuzz at the bottom of the pulsing rectangular waveform shown 500 times more slowly in FIG5.

I must be confused about something again. It looks like you are asking me to make the same oscillations as hers in fine detail,  but with different circuitry and device settings.

TK,

Yes, you always give the required data.  I thought your scope shot with your "drawing" on the screen was a scope shot in response to my question regarding the signal at the source, and I saw no supportive settings data.  My intended humor was a bit dry I suppose.

I was referring to the difference in the overall negative value on RA's traces between FIG4 and FIG5.  You'll note that the CH3 trace in FIG5 appears to be more negative than the same trace in FIG3/4.  Possibly as I said, it indicates that the FG ground was at opposite ends of the CSR in the two tests.

The little nuances missing may be 'scope BW related as you say.

PW

[Groundloop]

And also some of the FG's power is also dissipated in the mosfets themselves, isn't it? Or rather, there is a total power made up of the total resistance subjected to a total voltage so a total current flows. Both the battery and the FG or other source contribute to the total voltage, and thus to the total current. This current passes through the mosfet(s) both by the normal drain-source conductance but also by the various capacitances as well as the body diode, depending on the current's phase. So the mosfets are dissipating power, and the load is dissipating power. But how to assign the proportion of the contribution of each source to the dissipation?  If the mosfets dissipate 30 Watts, how much is coming from the batteries and how much from the bias source? And... ditto question for the load.

TK,

Yes you are right. Again, I want to keep it simple.
(You will use power to charge the Gate capacitance of the two MOSFET etc.)

GL.

[picowatt]

TK,

Do you have any opinions regarding the fork mount used on the Celestron CPC deluxe series?

Also, any experience with or info regarding the use of FASTAR optics?

PW

[MileHigh]

TK:

Thank you for the kind offer for the astronomical viewing one day.  I have been to Texas many times and you never know when I will go back.  If I change jobs one day and get a big territory that includes Texas then I may take you up on your offer.

All:

Like I said a while back, discussing the circuit with Rosemary is like WWII and the Allies fighting their way up the boot of Italy.  It's a hard battle for every square inch of territory.  Groundloop very nice drawing and perhaps when Rosemary sees that she will "get it."  It's apparent that she has constructed a belief system about the reason for the negative current flow and I suspect that she believes this "remarkable" fact is due to the zipons and the "binding material."

TK especially and others....  I am sure you are a fan of this series of drawings....   I suppose it applies to all of us one way or the other!       I will look around and may find a few others for a laugh or two.

MileHigh

[MileHigh]

The revenge of....