3v OU Flashlight

[wattsup]

@TK

About the core size, if you take any component on a photo like a mosfet that we know has x dimension, you can figure out the core dimension Akula is using. Your measurements are close to what I have as well but is it close to the one Akula is using.

I am saying this because yesterday when I received my ETD29 ecores for the AKula 30 device, I realized that this particular ecore, that others are using as well, is way to small. Even your ccore is at least twice the size. So just make sure the core sizes are comparable to the Akula device you are working on.

All the best.

wattsup

[MenofFather]

This is theory, not useful to me at present.
This is empirical fact, very useful. The configuration of the dual 494s in the circuit is arranged to produce this kind of "beating", that is the sound of mixed frequencies creating a third frequency from reinforcement and cancellation of the two input signals. Beat notes.

Now yesterday as I recall you were saying that only one of the mosfets needs the Miller clamp for fast shutoff. But now are you saying they both should have the clamp? It's a good thing I bought two PNP transistors, then....

But this thread is about a different circuit altogether. You are talking about the other circuit, with 2x TL494 and 2 mosfets. This thread is about the circuit using the MC34063 and the hex inverter chip, single mosfet (transistor).

I seems make mistake, need fast close one and other mosfet. But maybe more important fast close mosfet who works on feroresonance (200-400 kiloherc can be mosfet frenquency).
I make mistake and write into not needed topic. But no is topic about 1 W akula divice (lantern 2 and 3), so were me write this words or is that topic?

[TinselKoala]

I seems make mistake, need fast close one and other mosfet. But maybe more important fast close mosfet who works on feroresonance (200-400 kiloherc can be mosfet frenquency).
I make mistake and write into not needed topic. But no is topic about 1 W akula divice (lantern 2 and 3), so were me write this words or is that topic?

No matter, I can use the Miller clamp on both or just the lower one. I have transistors!

It's being discussed in the "Akula 30 W " thread, which is having problems today, I think.

Meanwhile here are two zooms into the oscillation/noise portion of the signal. The first one is at 500 microseconds per division, the second one is at 20 microseconds/div.  The square-topped pulses are the normal output of the MC34063 chip. They are happening at a variable frequency controlled by the circuit's feedback loops and are happening here at a frequency of about 25 kHz max in the "bunched up" bursts.  The spike and ringdown on the very top... seen in the second picture...  there are about four peaks in 20 microseconds, for a frequency of about 200 kHz for this resonant ringdown. If I did the math right.

Is this the "ferroresonance" you are talking about?

(Both shots are from the same data capture, I just zoomed in to make these images. The dotted red lines are the trigger location, so you can orient the two shots.)

ETA: The bursts themselves are happening at about 300 Hz in this shot, and this is the frequency one can feel and hear in the core vibrations.

[MenofFather]

No matter, I can use the Miller clamp on both or just the lower one. I have transistors!

It's being discussed in the "Akula 30 W " thread, which is having problems today, I think.

Meanwhile here are two zooms into the oscillation/noise portion of the signal. The first one is at 500 microseconds per division, the second one is at 20 microseconds.  The square-topped pulses are the normal output of the MC34063 chip. They are happening at a variable frequency controlled by the circuit's feedback loops and are happening here at a frequency of about 25 kHz max in the "bunched up" bursts.  The spike and ringdown on the very top... seen in the second picture...  there are about four peaks in 20 microseconds, for a frequency of about 200 kHz for this resonant ringdown. If I did the math right.

Is this the "ferroresonance" you are talking about?

(Both shots are from the same data capture, I just zoomed in to make these images. The dotted red lines are the trigger location, so you can orient the two shots.)

I not shore is here feroresonance. Here is other circuit. To find ferorerosonance use one turn on primary and one turn on secondary, on secondary put 10 omh resistor and oscilioscope. And put into primary from range 800-2000 kiloherc frenquency of 5 volts and were you get maximum amplitude on that resistor, here and is ferroresonance. Seems i write coresct. Akula say about one turn... but other part of his words I now not remember. Need relisten conference....
Or you can use other numbers of turns, if you get same frenquency of fading out vibration, then here can be ferroresonance...

[TinselKoala]

But... but.... TK.... you may say.... what about the envelope? Yours is all wavy and Akula's maintains a constant amplitude.

Ok... then I'll just have to turn off Bandwidth Limiting on my scope.



No changes in Any Settings, except turning off BWL in the oscilloscope: