Testing the TK Tar Baby

[picowatt]

My daddy died at age 84 and still had a full head of curly greywhite hair. I'm receding at the temples a little and have plenty of salt in my peppa... but I don't have the typical male pattern baldness. Low testosterone, I guess... but it's certainly been high enough, otherwise.

I don't know what came over  me, there. It probably isn't really a good idea to do that. There is after all something like 20 Watts radiated power at 750 kHz or so passing through my brain. Without attenuation too, which of course proves that there is only the purest emptiness within, as Zen recommends.

On the other hand, maybe a low power system wrapped around the mattress periphery could keep you warm without an electric blanket, just some woven conductive threads in the fabric itself.

TK,

Hopefully, the only damage done is that you will now have an incessant desire to quote Zen masters.

Now, if your hair starts to fall out, well, that would be something else...

PW

[Magluvin]

Nice vid.  The SNM is a cool feature.  This would be a great demo in schools. It helps peak interest. Guys and girls alike enjoy these things. I remember. ;]

I agree that there is some sort of lock between the Tx and Rx in SNM.

I suppose the "key " to finding out the differences would be to scope the Tx and Rx LC at the same time to see phase relationships between modes. Well, maybe all traces should be triggered at the transmitter end to show phase difference.

Like if the Tx n Rx are in "lock down" in SNM, what are they in normal mode?

Thanks

MaGs

[Magluvin]

In the cased version I have mounted the loop horizontally and this puts the heatsinks and Qs right inside the active zone of the loop. It doesn't seem to affect anything, the circuit performs the same and heats the components the same. I think it really needs a pretty close match in order to transfer power and anything that's not a RLC match is effectively transparent to the power.

You absolutely do need heatsinks; and don't even think about operating without the loop attached: the circuit will turn on one mosfet, see a direct short, and fry that mosfet in an eyeblink. I recommend, and have installed, a 7 1/2 amp inline fuse from the supply to the board. No, I haven't actually blown any mosfets with this design, but I did get some of the silicone HS compound so hot it vaporised from the heat pulse.

The freq and range depend on a lot of things; I will do a video with scopeshots, similar to the one I just uploaded with the DMM ammeter. Be patient please, there's a lot to do this evening.

I never thought about that. So the freq is like a key just to be able to absorb the energy from the TX? Otherwise it just passes on by? iron I suppose would change things. Lots of things to try.

Definitely on that fuse. When I was first doing electronics repair, my boss had shown to use a light bulb in series with the power in on amplifiers. Its a safe way to see if there are any immediate problems without hurting anything. ;] or even just after a channel repair, or what ever.

Patient? I can wait. When this gets interrupted , I hang till the dust settles and the Zen garden blossoms again. ;]

Yeah, was just wondering with the heatsinks and such near the Tx. The reason being, the Rx doesnt have that difference and there might be some possibility of 2 very closely tuned LCs but one being offset by such.  Dunno. ;]

MaGs

[PhiChaser]

It's really too bad your cup is so overfull, Rosemary. You should, if you want to be here at all, shut up, pay attention, and try to understand what is being presented. If you have questions, you may ask them. You are not qualified to criticise.

Perhaps MrSean2k and PhiChaser would like to chime in here with a response to Ms. Ainslie, since she chose to interpret their comments for us.

Heh heh, I would if I gave a crap about what Ms. Ainslie says, I know more about mosfets than she does (thanks TK and PW!). Several analogies (including drawings, animated pictures, videos, and LONG 'debate') later and she STILL doesn't understand them... Pity. You 'Guys' tried your damnedest, you really did.

So... Dear Reader, just so you know what was said by whom, read back a few pages and decide for yourself. TK is discussing his knowledge of a topic under discussion, others are giving him 'feedback'. Notice how he answers and replies to what was written by others. Now look at what was said and how Ms. Ainslie has interpreted it to suit her post. Seriously, this IS a recurring theme Dear Reader. She doesn't understand her circuit, just ask her if the batteries are connected! (sic) No, let's all wait until the 25th LOL!! Gimme a break...

Trying to help define in layman terms how electrons behave seems like a reasonable topic to me, it helps keep in focus the 'WHY' of charge. READ IT ROSEMARY!! Try to figure it out, don't block it out. Don't ignore it or try to tear it apart, READ IT!! Make a reasonable comment about the discussion, don't just bad-mouth people and try to make yourself seem the wiser. Have you even SEEN the work TK has done on your circuit?!? Jeeze. She SOOOOO doesn't get it...
On a lighter note, I hope to be ordering parts for a new 'TK headlight' this weekend, thanks for the schematic, parts list and build info TK! I'm sure I will have a question or two in a week or two about it heh heh...
Happy experimenting all,
PC
(Is that safe?!?)

[TinselKoala]

Nice vid.  The SNM is a cool feature.  This would be a great demo in schools. It helps peak interest. Guys and girls alike enjoy these things. I remember. ;]

I agree that there is some sort of lock between the Tx and Rx in SNM.

I suppose the "key " to finding out the differences would be to scope the Tx and Rx LC at the same time to see phase relationships between modes. Well, maybe all traces should be triggered at the transmitter end to show phase difference.

Like if the Tx n Rx are in "lock down" in SNM, what are they in normal mode?

Thanks

MaGs

Take a look at the circuit. It's a flipflop, and the mosfet drains are the outputs. So there are two ways to scope the output of the Tx. One can simply scope across the drains (across the tx loop and cap bank too of course) with a single probe, or one can scope the individual drains referenced to the common source (negative rail) using one or both probes, one for each side.
Doing the latter gives, of course, two  half-sinusoids, 180 degrees OOP. Doing the former gives the perfect sinusoid of the transmitter's output t the loop.  Scoping across the Receiver (everything is in parallel there so you just scope across the whole thing, and of course you are floating as well)... you simply get the perfect sinusoid of the induced oscillation in the rx loop.
SO.. using the first method for the Tx, both drains monitored, and the Rx monitored with the other probe.... everything is in lockstep, always, with little jumps when the SN mode happens, and slightly different frequency/distance relationships evident. I'll make a vid showing what I mean in a few minutes. As far as I can tell the Rx is in phase with the TX always, but shifts a bit with distance and then "snaps" into exact phase again when SNM happens. It's like a very sloppy PLL.