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Author Topic: 3v OU Flashlight  (Read 545946 times)

Offline TinselKoala

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Re: 3v OU Flashlight
« Reply #180 on: April 25, 2014, 03:47:23 PM »
Well, that's good news, I was afraid I'd run out of wire.

I wonder how many other "mistakes" there are on the schematic I'm working from, which definitely does say 27 and 54 mH.

However, I've tried the lower value side with several different inductors from 6 mH to around 900 mH and they all "work" in the sense of making the LEDs light up brightly. Just using the inductor on the "27 mH" side and nothing on the other side, those wires still disconnected. The heavier the inductance the less current is drawn by the device overall, in my preliminary tests. The thing works as a Joule Thief, needing less than 2 volts from the supply to light up the two LEDs in series to extreme brilliance, with an oscillation of flat-topped spikes of about 9 V peak.

Offline verpies

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Re: 3v OU Flashlight
« Reply #181 on: April 25, 2014, 04:56:44 PM »
I wonder how many other "mistakes" there are on the schematic I'm working from, which definitely does say 27 and 54mH.
Both of these schematics shown here state 27 and 54mH.
Wesley says 5.4mH, common sense agrees with this.

What does Akula say?  Is there a link to that video without Wesley's voiceover ?

...with an oscillation of flat-topped spikes of about 9 V peak.
But not the 80VP-P shown on Akula's scopeshot.

Offline Hoppy

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Re: 3v OU Flashlight
« Reply #182 on: April 25, 2014, 05:01:59 PM »
Well, that's good news, I was afraid I'd run out of wire.

I wonder how many other "mistakes" there are on the schematic I'm working from, which definitely does say 27 and 54 mH.

However, I've tried the lower value side with several different inductors from 6 mH to around 900 mH and they all "work" in the sense of making the LEDs light up brightly. Just using the inductor on the "27 mH" side and nothing on the other side, those wires still disconnected. The heavier the inductance the less current is drawn by the device overall, in my preliminary tests. The thing works as a Joule Thief, needing less than 2 volts from the supply to light up the two LEDs in series to extreme brilliance, with an oscillation of flat-topped spikes of about 9 V peak.

This chip is also used as an LED driver as you are probably aware, so its presumably quite efficient at this task.

I'm still considering the possibility of coin-cell or two in a pot, wired internally to the pot solder tabs. Its a pity we cannot see the underside of the 3V OU flashlight board, so that it might be possible to draw up a meaningful schematic.

Offline scratchrobot

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Re: 3v OU Flashlight
« Reply #183 on: April 25, 2014, 07:41:11 PM »
hi scratchrobot,

It looks like your device was just to about to self run for few seconds longer than the rest then it stops.

Do try to change resistor  to white led with a little higher value.

Do prevent the copper wire from touching the ferrite core.

I am sure someone may ask you where to get the ferrite pot core online base on the one your are using video. :D


Thanks for the tips, i will try them. The ferrite pots i used are B65701W 30 x 19 i got them from ebay.
I will also try other ferrite pots with the circuit. I don't think the circuit will self run but i like trying different coils to see what happens.


Regards


Offline TinselKoala

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Re: 3v OU Flashlight
« Reply #184 on: April 25, 2014, 07:43:41 PM »
Both of these schematics shown here state 27 and 54mH.
Wesley says 5.4mH, common sense agrees with this.

What does Akula say?  Is there a link to that video without Wesley's voiceover ?

I don't know, I am just working from the "official" schematic.
Quote
But not the 80VP-P shown on Akula's scopeshot.
That's right.... just almost exactly one tenth of the value shown on that scopeshot. Of course we don't know that the probe attenuation matches the channel setting....

More troubling is the waveform itself. I am not seeing anything like that, yet. In Akula's shot it appears that the frequency of the spikes is modulated by the voltage of the sinusoid from the secondary. But please don't forget that I don't have the complete inductor in my testing yet. However, the transformer inductors I have tried seem to have no effect of the "secondary".

If the actual inductances used are 2.7 and 5.4 mH, I should be able to get those values on my flyback ferrite easily enough. I'll be doing these tests with a full transformator later on this afternoon.

The DC-DC chip starts behaving strangely when the supply voltage is below 2 volts. I'm wondering now if the Akula waveforms are made by underdriving the chip.



Offline TinselKoala

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Re: 3v OU Flashlight
« Reply #185 on: April 25, 2014, 07:46:04 PM »

Thanks for the tips, i will try them. The ferrite pots i used are B65701W 30 x 19 i got them from ebay.
I will also try other ferrite pots with the circuit. I don't think the circuit will self run but i like trying different coils to see what happens.


Regards

Apparently the ferrite pot cores are not necessary. Akula has shown several different versions that don't use the pot core.... it is another Red Herring in my opinion. Good that you are trying them though... but I am building this version which does not include the pot core, just an ordinary flyback transformer ferrite. Of course Russian ferrites are special..... aren't they?

Offline TinselKoala

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Re: 3v OU Flashlight
« Reply #186 on: April 25, 2014, 07:57:57 PM »
This chip is also used as an LED driver as you are probably aware, so its presumably quite efficient at this task.

I'm still considering the possibility of coin-cell or two in a pot, wired internally to the pot solder tabs. Its a pity we cannot see the underside of the 3V OU flashlight board, so that it might be possible to draw up a meaningful schematic.

I think that the schematic is actually correct... as far as it goes, and with the problem of the decimal point still unresolved. The DC-DC-LED side works fine by itself, the inverter driving the mosfet works fine in isolation....

Yep, with proper setting of the trimpot and the inductor on the "primary" side (the side connected to 43063 chip) the current draw can be minimized, and I already know that the circuit will light the LEDs brilliantly using a 3v button cell, eg CR2016. But for how long? Soon, I will know that too.



Offline avalon

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Re: 3v OU Flashlight
« Reply #187 on: April 25, 2014, 08:06:52 PM »
I did hear Wesley say 5.4mH in his translation video.

Wesley's translation is wrong. Karnaukhov said 54 mH, not 5.4 mH.
There are many more discrepancies in Wesley's translation. He needs to work on his Russian. (Come to think of it, he needs to work on his English too.).

~A

Offline verpies

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Re: 3v OU Flashlight
« Reply #188 on: April 25, 2014, 08:33:23 PM »
Wesley's translation is wrong. Karnaukhov said 54 mH, not 5.4 mH.
Then Akula's core must have a hell of a permeability.


Offline Grumage

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Re: 3v OU Flashlight
« Reply #189 on: April 25, 2014, 08:44:44 PM »
Wesley's translation is wrong. Karnaukhov said 54 mH, not 5.4 mH.
There are many more discrepancies in Wesley's translation. He needs to work on his Russian. (Come to think of it, he needs to work on his English too.).

~A

Bad form Sir !!  >:(

Are you multi lingual ??

Wesley has helped us in so many ways. I feel you owe him an apology !!

Grumage.

Offline hartiberlin

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Re: 3v OU Flashlight
« Reply #190 on: April 25, 2014, 09:12:21 PM »
Hi All,
I made a compilation movie of the last 2 videos from Akula,
cause he seemed to have deleted his youtube channel....or I still
can not find it anymore.
Fortunately I did save these movies and have also put in the circuit diagrams,
at least for the higher power versions...cause the newest was not yet posted,
when I made this video...

https://www.youtube.com/watch?v=3GtDDQA3U4g

Enjoy !


Regards, Stefan.

Offline verpies

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Re: 3v OU Flashlight
« Reply #191 on: April 25, 2014, 09:17:04 PM »
Neither Russian nor English is Wesley's native language.
There are so many Russian native speakers on this forum, yet I don't see them translating videos.  If they did, he would not have to.

Offline d3x0r

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Re: 3v OU Flashlight
« Reply #192 on: April 25, 2014, 09:38:53 PM »
looks like 5.4mH and 1.25mH to me..... (Edit: no I'm wrong, 54 and 22)


http://youtu.be/Lpx1SJdXnmo?t=51s


and my crude drawing.... though it apparently doesn't apply for the flyback ferrites





someone should do a better job :)  the bottom and top foil windings should be the same way... and the first extends backwards from the direction the secondary is wound... then at the end, it extends backwards from the direction of the winding


(Edit: rotation is kinda backwards, resembles video more if flipped upside down)

Offline alejandroguille

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Re: 3v OU Flashlight
« Reply #193 on: April 25, 2014, 09:45:53 PM »
looks like 5.4mH and 1.25mH to me..... (Edit: no I'm wrong, 54 and 22)


http://youtu.be/Lpx1SJdXnmo?t=51s


and my crude drawing.... though it apparently doesn't apply for the flyback ferrites

drawing is a joke ...




someone should do a better job :)  the bottom and top foil windings should be the same way... and the first extends backwards from the direction the secondary is wound... then at the end, it extends backwards from the direction of the winding

Offline TinselKoala

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Re: 3v OU Flashlight
« Reply #194 on: April 25, 2014, 10:37:14 PM »
Then Akula's core must have a hell of a permeability.
Yep. I don't think it's possible to get that high inductance with what he showed (number of turns and core). Of course that's not the only impossibility around this circuit and claims....

 ???