Testing the TK Tar Baby

[Groundloop]

TK,

I never got around to take a picture of my test setup. Now I did
and here it is. This version has a 9 volt battery connector with
a 10K series resistor. Later versions uses a FG input instead.

My next test will be testing how much BIAS current the bias
power supply will source or sink when driving the circuit
from a 24 Volt power supply. I will use the attached circuit
drawing configuration while testing. There will be a moving
iron amp meter in series with the 50 Ohm resistor.

GL.

[TinselKoala]

@GL: Cool!

That looks like an actual low-inductance CVR. May I suggest something?
You are actually adding significant inductance with those long wires. These may be needed on the gate and drain for oscillations but they defeat the purpose of using a noninductive shunt. I'd suggest that you peel back the insulation on the leads right at the body and try clipping your current-monitoring scope probe or filtered DMM right up as close as possible to the body of the resistor. You can compare waveforms taken there, with waveforms taken with the longer wires you've shown now.

Good hunting !!

(I've also used little screw-type terminal blocks for mosfet sockets... they work really well because you can get good clamping pressure on the leads. That way you can reconfigure, swap mosfets, compare different types, without soldering, and you'll get just as good a connection as soldering if you clamp down tightly.)

Is that the super heavy duty military-grade 9volt battery clip? I've never seen one that ...er... sturdy looking before.

[Rosemary Ainslie]

Rosemary,
What does Wiki actually say? See the highlighted text.

Hi Poynty.  I've answered you in my edited post.  But just as a guide.  Watts are determined OVER time - where WORK is determined as a PRODUCT of time.

We've already discussed this.  Wiki therefore 'errors' - certainly on this point.

Rosie Pose

[TinselKoala]

Hi Poynty.  I've answered you in my edited post.  But just as a guide.  Watts are determined OVER time - where WORK is determined as a PRODUCT of time.

We've already discussed this.  Wiki therefore 'errors' - certainly on this point.

Rosie Pose

So their _words_ in WIKI explaining the equation you parrot are wrong... but the equation itself, with different meanings assigned by you to the letters, is correct and proves your point.

Right?

No, don't bother answering. You are ineducable and incorrigible as well as being ignorant and arrogant.

But I would like to know this: You frequently use the term "relates to" when you are talking about these computations. What does that mean? Proportional to, equal to, the same as, inversely varies with, correlates with.... just what do you mean when you keep saying something "relates to" something else? I don't find it in my Penguin Dictionary of Mathematics.

[MileHigh]

ReFried:

Awesome posting.  The La Mancha Prize for Rosemary it is!  Perhaps she curtseys at Zipons?

Tilting at windmills is an English idiom which means attacking imaginary enemies. The word “tilt”, in this context, comes from jousting. The phrase is sometimes used to describe confrontations where adversaries are incorrectly perceived, or courses of action that are based on misinterpreted or misapplied heroic, romantic, or idealistic justifications.

Groundloop:

It looks like a nice little setup.  If you get the negative oscillation mode going it will be interesting to see what average DC current you measure.

MileHigh