Testing the TK Tar Baby

[MileHigh]

Well I hope that you have 'backup' to help you.

MileHigh

[Rosemary Ainslie]

Well I hope that you have 'backup' to help you.

No need for that 'hope'.  There's plenty available.  And all of it much required. 

R
I'd rather not keep answering your interjections if you don't mind MileHigh.  I'd prefer to see this argument progress.

[TinselKoala]

Wait..... OK... so by applying a negative voltage to the _sources_ of the Q2s I am effectively applying a positive voltage to their gates. Effectively, right?
And with a floating supply there's no problem, except for the energy capacity of the supply and where this energy is going.

But the problem arises when one or the other of the points where the FG attaches... either the Q1 gate+2 sources, or the Q2 sources and the Q1 gate..... isn't floating but is tied to the circuit ground point at the negative rail. This happens when I try to use the most negative battery as the bias supply for the 555 timer directly, hence the need for the voltage inverter to give me a voltage that is truly more negative than the battery's negative pole.

If I just leave the "FG +" connection disconnected, and run a pot across the running battery's lowest unit, and take a wire from the wiper to the "FG -" point (Q2 gates, Q1 source) then I'll be effectively shorting that wiper back to the negative battery through the 1/4 ohm shunt. Like I said before, when I try this nothing happens. No change in the scope traces from flatline, I mean.  Certainly I am sending a current through the pot and the CVR but this is a closed loop and the gates don't care about it, apparently.

[hartiberlin]

Okay TK,
now with your new video

http://www.youtube.com/watch?v=fC7zJouJAoU

with just the 9 Volt battery and the pot
we have the perfect oscillation, just oscillations and no more
switching ! Well done.

So this is the most easy way to get rid of the function generator
and Rosemary and her team should be able to replicate this.

P.S. The second oscillation you have shown were probably just
some weird 60 Hz jammed overlay of your scope not triggering
as you did float one side of the pot so it was not a real voltage divider anymore...

So please can you show now via a shunt resistor, where you measure the 200 mA
in the 9 Volt battery case ?
Is that flowing through your 50 Ohms shunt ?
Can you please show a scope shot  on this shunt resistor ?

Many thanks.

Regards. Stefan.

[TinselKoala]

No need for that 'hope'.  There's plenty available.  And all of it much required. 

R
I'd rather not keep answering your interjections if you don't mind MileHigh.  I'd prefer to see this argument progress.

Rosemary, MH first said that you are over your head when it comes to the 555. You then CHOSE to jump in and berated him, you insulted him and once again started your same old same old. Then.... you had to agree that he was RIGHT, you don't know a 555 from an op amp and won't be bothered to learn, not even from this thread.

Now... please go away, you are not helping at all, in fact you have once again diverted the thread from the topic and you  HAVE NOT ANSWERED A RELEVANT DIRECT QUESTION.

And not only that but I am doing YOUR WORK FOR YOU and I resent your attitude. Please go away.