Testing the TK Tar Baby

[picowatt]

@MH: 70,000 uF, not 700,000 uF. (71,000 actually.)  I wish....


I do have a 1 Farad cap.... at 3.5 volts.

And those "good" ceramics I have there are only 500pF and I only have about 20 of them.

But I'll manage somehow, probably.



So we still are having a lot of trouble getting Ainslie to understand that a Function Generator will provide current and in this circuit does act in series, either adding voltage (in the negative bias mode) or subtracting it (in the positive gate pulse mode) to that of the main battery. When the mosfet(s) are conducting there is a closed circuit for this power to flow, and it has a total DC resistance made up of the load, the battery's ESR, the CVR, the mosfet's Rds at the gate charge level seen, and the function generator's impedance. If this total resistance is on the order of 300 Ohms, with a battery voltage of 48 volts and a FG drive of 10-12 volts..... well, Do the Math (tm RA).

http://www.youtube.com/watch?v=q98QB6HTA6s

8 or 12 views even before I posted a link...... spooky.

TK,

I would consider MH's "series cap replacing a battery" as a second (excellent) test of a "rundown" type test independent of the pos/neg mean pwr test bypassing all or one of the batteries.

Have you tried placing some caps across the batteries yet just to see how this affects osc?

PW

[MileHigh]

TK:

What difference does it make?  After all the capacitor only INITIATES a current flow on the inductive components in that circuit.  If it allowed a flow of current from its own CHARGE IMBALANCE - then it would defeat the basis of the Laws of Induction.  The potential is PRESUMED to be COUPLED from the imbalance of CAPACITIVE electron flux.  Therefore a smaller capacitance will still not defeat the basis of the Laws of Capacitive Reaction in a pulse modulation context.

MileHigh

[poynt99]

.99,

Regarding your sim schematic, is there a reason you chose position 4 instead of position 3 as the ground point?

I would think this would exclude the CSR and its inductance from the M2 feedback network.

PW

It didn't look right when I changed it, now I see why, thanks. I've updated the schematic. Should be ok now.

The battery power measurement changed to -32W (-128W accounting for R_CSR=0.25), and the average current for both the FG and Q2 Source is now 210mA.

[TinselKoala]

TK:

What difference does it make?  After all the capacitor only INITIATES a current flow on the inductive components in that circuit.  If it allowed a flow of current from its own CHARGE IMBALANCE - then it would defeat the basis of the Laws of Induction.  The potential is PRESUMED to be COUPLED from the imbalance of CAPACITIVE electron flux.  Therefore a smaller capacitance will still not defeat the basis of the Laws of Capacitive Reaction in a pulse modulation context.

MileHigh

Can I get some scrambled eggs with that tossed salad?



http://www.youtube.com/watch?v=7BUH3Gd9qAA

[picowatt]

It didn't look right when I changed it, now I see why, thanks. I've updated the schematic. Should be ok now.

The battery power measurement changed to -32W (-128W accounting for R_CSR=0.25), and the average current for both the FG and Q2 Source is now 210mA.

.99,

Looking good.

Is this the sim that has issues with Rgen=50R?  Even with V1 at more like -12V to -15V?

I really like your sim work...

PW