Quote from: picowatt on April 29, 2014, 01:38:14 PM
TK,

I see R3 is a 100R not a 200R, so I should have said that even if/when the MOSFET/transistor does turn on, it only appears to apply an additional 100R load to the rail.  I am, however, surprised that the sine wave gets through with C5 installed (assuming I am looking at the correct schematic).

PW.

I've lifted that C5 cap several times to see the effect on operation, and it appears to be necessary to see the sine wave. Without it I just get big noise spikes everywhere,  no coherent patterns that I can tell.

The schematic I'm using, with my current changes,  is attached below.

What is the result? LEDs are lit without 3v power?

TK:
I hear your rant. It gives a good idea of the approach to the problem. I.t.o. backing cakes don't you need the correct recipe? Correct ingredients? Maybe get on a plane and go see Akula (who's name is Roman and has dark slightly curly hair, roundish face with green tinted brown eyes, not the tallest guy either, about 25 - 28 years of age).

ALL:
Something to experiment with, no promises tho, and yes I have practically done this. Put two coils on the ferrite. One across each joint of the ferrite . Create an air gap on one side BUT no gap on the other side by tilting the one half. The coil on the gaped side is your driving coil, the other is the receiver. Play with the applied frequency. Drive it with a balanced wave (aka pos swing = neg swing), square wave works well. E-cores also work, the drive coil can be on the middle or outer arm, receiver on the outer. Since it is an interruption of conductance of resonant flux effect the amount of flux is determined by the load matching and the air gap. It is like a Joule ringer with much less turns on the output and can be tuned by the air gap.

I have another project that I am working on and the business to run so might not get over here as often as I'd like.

Have fun!

PS: Tip for NAR - modulate one frequency onto another. One for magnetic resonance and one for acoustic resonance. That is why you see two waves on akula's scope. Also, the core material does play a big role. You can make your own ferrites. But I don't think this is the correct thread for that. Good luck with of the shelf - unless you are an old russian. Unit then, check out this guy (best science guy on youtube, well in my oppion): https://www.youtube.com/watch?v=wSZGUV8D19I

The capetonian

Quote from: TinselKoala on April 29, 2014, 10:37:42 PM
I've lifted that C5 cap several times to see the effect on operation, and it appears to be necessary to see the sine wave. Without it I just get big noise spikes everywhere,  no coherent patterns that I can tell.

The schematic I'm using, with my current changes,  is attached below.

hi TinselKoala,

It looks like you are following the Akula variation.Have you considered implementing resistor in series with Led(Limit current to led) and discharge resistor(around 560...3.3k ) connected in parallel with C5 100uf to ensure the sine wave looks like nice sine wave.

-----------------------------------

Finally received the 4.7cm diameter Ferrite pot core as attached after waiting for nearly one month.Now i shall patiently wait for copper foil to magically appear at my door step. 




 

Hi TinselKoala,

Do you have the time to test your circuit according to the attached circuit?

GL.