Kapanadze Cousin - DALLY FREE ENERGY

[d3x0r]

It's probably NOT 4.6Khz frequiency;  I demonstrated earlier, my toroid rings at more like 6.9Khz, and I can get it to sing with a frequency, but when I increase the frequency, it will again ring.  THat was an assumption from audio analysis; and although that's probably a harmonic or octave of the driving frequency the dirving frequency is probably much higher.  I get best results at 192Khz range; and even in that range, my toroid rings audiably.

[Hoppy]

It's probably NOT 4.6Khz frequiency;  I demonstrated earlier, my toroid rings at more like 6.9Khz, and I can get it to sing with a frequency, but when I increase the frequency, it will again ring.  THat was an assumption from audio analysis; and although that's probably a harmonic or octave of the driving frequency the dirving frequency is probably much higher.  I get best results at 192Khz range; and even in that range, my toroid rings audiably.

I very much doubt its operating at 192KHz, given that he is most likely using an iron-cored mains transformer. Also, the TL494 timing cap / resistor values on the schematic would not produce this frequency. My frequency sweep is 6KHz to 100KHz with the specified values, so a little short of 4.6kHz. Dally's inverter frequency was more likely higher than 4.6KHz but a variation on the nominal cap value within tolerance could account for the 4.6KHz.

Regards
Hoppy

[verpies]

I think that the most important point of d3x0r's observation is that the mechanical/acoustic resonance of a ferrite core is different from its electromagnetic resonance frequency.

Also the amplitude of core's acoustical vibrations is the highest when driven by an electric current that is a harmonic or subharmonic of the core's fundamental acoustic frequency.

[Hoppy]

I think that the most important point of d3x0r's observation is that the mechanical/acoustic resonance of a ferrite core is different from its electromagnetic resonance frequency.

Also the amplitude of core's acoustical vibrations is the highest when driven by an electric current that is a harmonic or subharmonic of the core's fundamental acoustic frequency.

Good point. Given that Dally's transformer is ferro-magnetic, then the audible analysis from the video at around 4.6KHz would correspond with the operating frequency. It does in my case using a mains toroid transformer.

Regards
Hoppy

[madsatbg]

@verpies,

The pictures shown in post #574 are probably not from the Dally circuit, but from someone who replicated it using this PCB, probably by madsatbg himself.


@madsatbg

is this so?  And if yes, are you able to drive the KT926A fully open?



Regards Itsu

Yes, you are right. These boards are mine.
Made from a given Dalli originals.
No, I have not yet tried.


regards

p.s.@verpies,
Sorry about that, I rarely write in this forum.