Testing the TK Tar Baby

[Magluvin]

Oooo Oooo  numbers.     lol    When you put your finger on the motor flapper, and kept the buzzing flapping going, I was trying to figure out what it sounds like and why it was so funny.  Who cares, LMAO.  It was like a long dragged out IN YO FACE moment that seemed like an end to it may never come, just grinding it in there till it was a stub.  lol  " See that, theres your light bulb alternative, say hello to stubby!"

Nice show.

So if you put 2 rx loop/lamps, even 3 at different angles, the input always closely represents the output totals? 

Lemme ask ya. If I have a 2mh air coil and a 22uf cap that resonates at 758.7hz, or so, would your driver circuit automatically operate at that resonance freq?

MaGs

[TinselKoala]

Oooo Oooo  numbers.     lol    When you put your finger on the motor flapper, and kept the buzzing flapping going, I was trying to figure out what it sounds like and why it was so funny.  Who cares, LMAO.  It was like a long dragged out IN YO FACE moment that seemed like an end to it may never come, just grinding it in there till it was a stub.  lol  " See that, theres your light bulb alternative, say hello to stubby!"

Nice show.

So if you put 2 rx loop/lamps, even 3 at different angles, the input always closely represents the output totals? 

Represents? What an "Ainslie-ese" kind of word... I prefer words with more precise meanings. Like correlation, or linear relationship, or inverse relationship. In other words, yes it represents the output totals closely, scaled. The input depends on the load, directly, with about a 0.5 "scaling" or loss factor, apparently, and with about 0.6 A draw when there's no (obvious, deliberate) load. If I have those bulbs which total 20 watts dissipation at the brightness level they reach when hooked to a fully charged 12 volt battery, and they seem, say, twice as bright when in full resonance mode... call it 30 Watts dissipation? Ballpark? And at that full brightness level the current draw from that same battery is a bit over 5 amps, so something just over 60 Watts input.

Lemme ask ya. If I have a 2mh air coil and a 22uf cap that resonates at 758.7hz, or so, would your driver circuit automatically operate at that resonance freq?

No, I don't think so, it's much too low. I think that what is happening is that the receiver and the transmitter both change their resonant frequencies through mutual coupling and "meet in the middle" so to speak, and so their natural freqs have to be close, and they have to be what's determined by the low inductance and relatively high capacitance of the tx. I am sure there's also some relationship between the wavelength and the length of wire in the loop as well for optimum performance. I haven't run any numbers yet, but my tx is operating at 812500 Hz about, and the transmitting loop is a circle with a diameter of 7.5 inches.


ETA: Wait, do you  mean subbing those values into the tx circuit instead of its 60 nF and single turn? I have no idea if it would work or not.

[TinselKoala]

Some numbers.

http://www.youtube.com/watch?v=LZtrgXu0nrM

[picowatt]

Some numbers.


http://youtu.be/LZtrgXu0nrM
(still uploading)

TK,

Have you tried 'scoping xmtr and rcvr yet?

Does the 'scope's common lead grounds spoil the "supernova" mode?

Phaselocking?

PW 





   

[TinselKoala]

TK,

Have you tried 'scoping xmtr and rcvr yet?

Does the 'scope's common lead grounds spoil the "supernova" mode?

Phaselocking?

PW 





   

Scoping both xmtr and rcvr simultaneously presents no problems at all. There is no discernible effect on hooking up the scope grounds... wait... yes, the phases are of course locked, and I believe this is true whether or not the scope grounds are connected, but it does seem that the "supernova" mode is _more_ stable with the scope grounds connecting the two units. Hardly fair, that.

I don't have a diff voltage probe here, nor a scope with  isolated grounds like the Fluke0Scope.

Both traces indicate nearly the same voltage, too. There is only a couple volts drop (from 50 or so p-p at the tx) across the usual 3 inches I'm using as a "standard" distance.

ETA: Phaselocking: no, the xmtr isn't phaselocked to itself, I don't think. The frequency of oscillation varies a bit with the coupling, getting smoothly lower the closer the loops approach, but at the "supernova" transition there is a little jump in frequency, so maybe it is attempting to phaselock with itself and stabilize its own frequency at the resonance.