Replication of Mini Radiant Exciter circuit of Nelson Rocha

[Zephir]

This circuit only draws a few milliamps of power

Because you had disconnected the load at the charger output. Without load the circuit can oscillate, but after then the T1 cannot generate the output, because its primary circuit will not be closed. Anyway, the T1 primary and L1-T1 coil represents just a short thick wire, connected directly to T1 collector. It will short the source too even without any load. But you missed the L1-T1 coil in your replica too, so you were saved from this scenario. I think, your transistor got ruined with negative spikes instead, which this circuit doesn't prohibit. Finally, you didn't explain, where the power resistor (which you mentioned in your previous post) should be connected.

I stressed in Grumage's thread that everyone should build this very simple circuit

So you did it, the circuit died - what next? Don't play smart and try to cooperate. No ones hands will be twisted here.

[Vortex1]

Zephir said:

Hi Vortex1 - and thank You very much for your circuit and detailed description of it.
Now I think we have state-of art formulation of the problem and we can start with its analysis.

You are very welcome. Unfortunately there is one missing ingredient that will stifle exact replication and that is the exact core material formulation type for T2. Without that there will be widely varying operation of the circuit. Yes it will work to some degree, but it will not be a true replication. T2 will set the basic operating frequency of the device, and various core formulations will give widely varying frequency of operation.

Maybe I missed it somewhere and the core has been positively identified.

Regards

P.S. I edited my prior post while you were typing.

[Zephir]

various core formulations will give widely varying frequency of operation

They undoubtedly will, especially under parametric circuit wiring. I made way simpler Joule Thief circuits and they still behaved wildly under variable load. So that this feature isn't very surprising for me - it deters me from its replication instead. If you could provide some more specific recommendation regarding the core used in original Mr. Rocha's circuit, we all would appreciate for sure. It looks like the MnZn ferrite core PC40 (Y12000 or Y15000 material) from Micrometals or American Magnetics by its green color. You're right, that Nelson Rocha's operates very smoothly. I also noted at his video, the output transformed is shielded with (grounded?) copper foil.

I take your remark about batteries hidden inside the resistor into account, but it's still the last option. I don't think that Mr. Rocha makes fakes. First I want to check the behavior of core under situation, when its saturation during charging will significantly differ from its state during discharging. I just think, that the common Joule Thief circuit isn't the best test bed device for this purpose.

Other than that the multispectral oscillations are traditionally related to scalar waves, Rodin/caduceus coil and overunity circuits. It has also certain physical justification in character of nondispersional solitons - once these solitons will be formed with mixture of many others of multiple wavelengths and amplitudes in a proper fractal ratio, then they will propagate without scattering. So that such a mixture of solitons can propagate at large distance unchanged - for example during tidal bores in Amazonia.

[Dog-One]

Dear Vortex1,

Something I would like for you to consider that crossed my mind a few hours ago.

We do not know with certainty the polarity of the 1:1 toroid.  Suppose it was reversed
from our normal understanding of how this device would need to oscillate.  Would it be
possible the TIP122 is sensitive enough for it to see the "recovery overshoot" and trigger
on the one-and-one-half cycle instead of the normal one cycle?

If so, could this be the mechanism for parametric oscillation?

[Vortex1]

Dear Vortex1,

Something I would like for you to consider that crossed my mind a few hours ago.

We do not know with certainty the polarity of the 1:1 toroid.  Suppose it was reversed
from our normal understanding of how this device would need to oscillate.  Would it be
possible the TIP122 is sensitive enough for it to see the "recovery overshoot" and trigger
on the one-and-one-half cycle instead of the normal one cycle?

If so, could this be the mechanism for parametric oscillation?

Dear Dog-One

You bring up an interesting suggestion. In my experience, blocking oscillators (JT's) when wired "correctly" and that have proper base drive tend to work at one predominant frequency and are quite stable. Wired with the opposite phase, they will have a few much higher frequencies of operation and are very "touchy". They are also not very efficient in this mode.

If NR's device is somehow using the abnormal mode for some reason, that will have to be the subject of a lot of intense benchwork. I do suspect the 4700pF cap is doing something different with the circuit on accident or on purpose.

I also respect Zephir's hypothesis regarding the control of the T2 saturation. You asked if it could contribute to a parametric mode of oscillation...perhaps. I'm a bit perplexed  by the dual path base drive scheme, though it looks like gross overdrive  (current wise) of the base to me. I don't expect the base to survive very long in that circuit. Nothing to limit base current. So don't be surprised if you fry transistors.

I built my first blocking oscillator back in the mid 1950's when the CK722 transistor hit the $0.99 price break for experimenters. It was used for a Halloween prank to light a four foot fluorescent tube (like a light saber) and extort candy door to door from surprised residents. Since then, I've fiddled with JT's from time to time as they call 'em today but being an old timer I still refer to them as blocking oscillators, the generic name most engineers use. I've actually built some blocking oscillators for commercial products back in the day. Funny how everything gets rebranded as something new every couple of decades. So much for my long winded old timer rant. Sorry if off topic, just delete it.

Kind Regards