3v OU Flashlight

[TinselKoala]

Hi TinselKoala,

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

GL.

Yes, I have time and that test is on my schedule, already anticipated.   

Thanks for your work on the other circuit schematic by the way, I'll be starting a build on that one later this afternoon.

Meanwhile, I've cleaned up a few discrepancies and am now able to get a much more stable performance over a wider "tuning" range. Here's a shot of the current performance. This is at 3.0 V, about 70 mA input. (Since this is a pwm circuit, the current draw is set by the tuning and can go anywhere from zero (with LEDs dark) to around 400 mA with brilliant LEDs (no burst oscillations)).

Unfortunately the LEDs still fade out over a couple of seconds when the input power is removed.

ETA: I removed the 2.2 pF cap across the R2.

[TinselKoala]

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. 

No, I hadn't considered it, but now I will. Thanks for the suggestions.

ETA: Bridging the C5 with reasonable resistance values had no real effect that I could tell. But adding a 100R at the cathode end of the LED string to ground did help to stabilise the envelope! Thanks for that suggestion. It added a little current but made the burst oscillation/sinus waveforms a lot more stable, actually. Thanks again!

Unfortunately... the LEDs still dim and go out when the power is removed.

[wattsup]

@all

Very sorry for interjecting here. Just wanted to know if you guys are having any trouble getting to page 69 on the Akula 30 thread. Hmmmmmmmmm. All other pages are fine except the last page 69. Maybe the number says it all. hahaha

While I'm at it, as some are working this circuit, please take a known object on the circuit, get its dimensions, then extrapolated the dimensions of the ccore Akula is using. Very important to do now.

wattsup

[TinselKoala]

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

Not for me. Only for Akula, in Akula's laboratory.




"yet"

[MenofFather]

Acording what akula about 1W lantern 2 (with supply) and 3 (without supply) one frenquency is 4-7 herc and duty cycle 50 precents, other frenquency is 400-460 herc. But ferroresonance frenquency can be higher, for example 1.6 megaherc. So duty cycle of 400 kiloherc, let say, frenquency must be 12 precents.


But inportant is fast closing one and other mosfet, to not make mistakes, better use wery fast closing one and other mosfet. Then we hear sound of 5-15 kiloherc in video, here is sound of mixed two frenquencies, how, something like that, explain Akula.