Testing the TK Tar Baby

[TinselKoala]

Still waiting, along with your pitiful straw men for company, pretending not to understand?
Still blatantly ignoring the wishes of our host, just like Ainslie does?

Of course you are. How can you do otherwise? You've hugged a Tar Baby to your breast.


And I'm SPECIFICALLY extremely offended by the way she portrayed my moustaches. I am very sensitive about my moustaches and she has them utterly and completely WRONG.... as usual.
http://www.youtube.com/watch?v=Dc1Qx8dOlYY

[TinselKoala]

Preparing to construct the Altoids Negative Mean Power Product COP>INFINITY demonstrator.

This was tossed out by me as a thought experiment, and .99 took up the "challenge" and designed the circuit in his sim, where the negative mean power product shows up nicely. I've got all the parts now, including some little 2.2 uH inductors, and I'll be working on this today, off and on.

This should result in a pocketsized, 9v-battery powered mosfet oscillator that can be seen to power a load (LEDs or a resistor that can be felt to heat up, perhaps with a LC thermometer strip or other small cheap thermometer) and that can be easily hooked up to an oscilloscope to demonstrate the mean negative power product and the decreasing energy integral.

So... if it works.... the only mystery remaining will be to explain..... why the battery DOES discharge, if zipons == true.

ETA:
@.99-- could you please try the sim with 2.2 and also 4.4 uH inductors in place of the 3.3s you have shown? It will be easier for me to reach these values with the components I've got.

[poynt99]

TK,

Yeah, I'll try the 2u2 and 4u4 values later tonight and let you know.

.99

[TinselKoala]

Thanks, .99. Also could you try 1n914 or 1n4001 in place of the 1n4007s? I have about a thousand 914s and only a few of the 4007s.


Here's another circuit of interest. This one is for SOC under load testing of NiCd batteries for RC airplanes, with an "expanded scale" indication using LEDs. The component values shown put a load of about 200 mA on the battery under test, and test either 4.8 or 9.6 nominal voltage NiCd packs (the 8 cell indicated at half voltage by use of the divider selected by the switch.)

The principle of operation is evident, and I think that the resistor values and Zener voltage could be changed, along with the addition perhaps of another 2 ea. LM339 comparator chips to double the indication range.... to apply a load (some power resistors, to give say 2 amps draw for a brief time) to a battery or a stack, and then sensitively display a precise and accurate SOC indication by lighting the corresponding LEDs.

For a 48 volt battery pack, the voltages of interest could be read off the manufacturer's published discharge V-SOC curve. Say 16 voltages between 53.0 and 45.0, spaced to correspond to 7 percent SOC intervals on the curve.

This looks to me to be under 10 dollars in parts, even for the expanded 16-level version.

[TinselKoala]

@.99
OK, I found my  diode stash, I have plenty of 1n4007s. Still, it would be nice if I could use some of these silly 914s.