3v OU Flashlight

[TinselKoala]

@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

It doesn't seem to be working for me either, I can't get to any pages there. Probably somebody posted a huge image or something.

Or the MiBs have gotten to it finally....

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

Huh? Can you translate that into a language I might understand?

I am using a flyback transformer ferrite, made of two identical halves. The round part that goes inside the coil is 14.4 mm diameter and the square part outside the coil is 14.4 mm x 11.5 mm. The overall length when assembled is 62.8 mm and the width is 40.0 mm. It has the stock spacer glued to one face of the squareish part, mica I think, 0.33 mm thick, about. It's held together by a spring clip that fits into grooves in the outside surfaces of the squarish part. Right now I am using it without any extra spacers. I like it very much.

As far as I can tell this is not an irradiated Soviet ferrite. It measures 50 ohms/cm on the surface, contacted with point probes. I think it came from a Japanese TV set, Mitsubishi big screen, IIRC.

[magpwr]

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.

hi Tinselkoala,

It seems there is indeed improvement in your waveform.

Do try to ignore the 270hz ,as the core value used is different from Akula.If you force it to be even close the 270hz ,you might be compromising efficiency unknowingly.

I was hoping you used 220...330ohms in series with Led.But i think it's ok with 100 ohms.
"blue Led do consume little more current than typical green or white led."

The high efficient green led i used in the original circuit connected to 4069 is 27kohms instead of 1kohms and yet i can see it's bright enough.The old green led purchased over 10years ago don't even come close."Pri objective was to lower circuit current draw before even receiving core or MC34063."

The shape of blue waveform  near the top peak looks a little strange.I think i have seen this waveform before likely related to capacitor value 100uf or 1000uf which might be little high do try mixing capacitor eg:47uf+22uf=69uf or 47uf+47uf(low ESR this way) to observe the effect.

[lost_bro]

Hello All

Sorry Off topic:

Page 69 of akula0083-30-watt-self-running-generator doesn not open for me this morning...

Anyone else with same problem?

thanks
take care, peace
lost_bro

[TinselKoala]

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.

This is theory, not useful to me at present.

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.

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).

[TinselKoala]

@magpwr: At first I thought that the 270 Hz was due to the circuit picking up some stimulus from the environment. I still might think that, I'm not sure. But if it is, I clearly have the same stimulus in my environment here.

So it seems that you are saying that there is some property of the core, not related to inductance, that determines "efficiency" and that my core, being different.... even though it makes nearly identically the same frequency, same waveforms by using the same external component values.... only the pot setting could be different.... might need to be tuned to some other frequency to reach the necessary "efficiency" to keep the LEDs lit when power is removed?

Sorry, I don't buy that, it's hand-waving special pleading. Let's see some working device, from someone other than Akula, that uses this schematic, works at a different frequency and keeps the LEDs lit. That would be evidence. Or even.... send Akula a Japanese ferrite and let him show how it makes the LEDs stay on at a different frequency.

LOL.....