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Overunity Machines Forum



Testing the TK Tar Baby

Started by TinselKoala, March 25, 2012, 05:11:53 PM

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picowatt

#4320
July 22, 2012, 06:01:42 PM
TK,

Regarding the 10K resistors in your wireless pwr osc, at first I thought they were bias dividers, but the ratio is too high to make much sense (re the 100R). 

Are the 10K's only there to ensure that everything discharges when the power is removed?

PW

ADDED:  Just looked at the schematic again, and the 10K's don't even appear to be there for the above purpose.  They will pull the gates down to a degree once pwr is removed and also assist in discharging the cap at the drains to a degree. 

What do you think they are there for?

picowatt

#4321
July 22, 2012, 06:49:27 PM
TK,

Re the 10K resistors, about all I can see that they do is ensure discharge of C9 when the pwr is removed so that when powered up, the gates are at zero volts to begin with.

PW

TinselKoala

#4322
July 22, 2012, 06:58:03 PM
Well, they are gate pulldowns, of course, but I thought that they also function during oscillations. I have not tried varying these resistors from the recommended values. As gate voltage dividers along with the 100R they aren't doing much, that's for sure. And the circuit does work with no C9; it's there for power supply filtering and.... the mouth.

TinselKoala

#4323
July 22, 2012, 07:02:14 PM
I really haven't explored variations on this circuit as much as I'd like to, other stuff has intervened. In the next couple of days, I'll be making a proper testbed, so that I can try different mosfets and different capacitors more easily, and I'll put in 10k or 50K trimpots for the 10K gate-to-source resistors as part of the testbed.

picowatt

#4324
July 22, 2012, 08:08:49 PM
Quote from: TinselKoala on July 22, 2012, 07:02:14 PM
I really haven't explored variations on this circuit as much as I'd like to, other stuff has intervened. In the next couple of days, I'll be making a proper testbed, so that I can try different mosfets and different capacitors more easily, and I'll put in 10k or 50K trimpots for the 10K gate-to-source resistors as part of the testbed.

TK,

I suspect the circuit would operate just fine without the 10K's.  Possibly in some other version they were used as bias dividers, but I'd be very careful with decreasing their value.  You don't want to increase the Q's dissipation.

Again, about all I can see they do is ensure C9 is discharged when the Batt+ is disconnected.

PW
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