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Author Topic: Single AA battery to light WHITE LED for long-long time  (Read 186888 times)

zon

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Single AA battery to light WHITE LED for long-long time
« on: March 05, 2008, 11:18:40 AM »
It's another my experiment. Another version schematic based on i post in http://www.overunity.com/index.php/topic,3599.msg80317.html#msg80317

Single AA battery to light white LED.
Until now (more than 96 hours) still light on without "reducing" power of battery.  I'll keep it on until the battery dead but  i hope it will not.  :)
I revised the original schematic, change diode from 1N4007 to 1N4148. I think is a best. Thanks for newton2 for your comment.

And now i have 2 circuit, i'll keep eye on it.   One with 1N4007 and  new on with 1N4148.
Same Battery using AA NiMh, 1.2 V 900 mAh.

Attachment is original schematic, please change 1N4007 to 1N4148

zon
 

Freezer

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amigo

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #2 on: March 06, 2008, 12:14:21 AM »
That looks to me like a Bedini style circuit, and I know because I've built my own "Bedinified" version of Joule Thief. I did not use a toroid core but a ferrite bead with 20 turns of AWG 30-34, bi-filar wound.

You can do away with the 1N diode and the capacitor, they are not really necessary, remember LED is a diode...

The issue I have with these circuits is that they appear to be good for a single LED and 1.2-1.5V battery source only. I hoped to extend them into driving 30+ LEDs from a 3V-6V source, as brilliant as possible, without much luck so far. I tried winding different configurations of coils, even used RStiffler's SEC driver and AV plug, yet brilliance is nothing I want to use as a normal light replacement.

zon

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #3 on: March 06, 2008, 03:29:24 AM »
@freezer

Yup, my schematic get inspiration from "make a joule thief" and John Bedini "Simplified School Girl Circuit" and the principle that charge is not consumed but wasted in conventional electrical circuit as mention in "free-energy plans"  look at http://www.opensourceenergy.org/Portals/0/NTForums_Attach/Free_Energy_Plans.pdf .

"Make a joule thief" is a classical circuit, DC-DC converter, where is a cathode of LED connect to ground (-)     It will drawn the battery source.

My diagram combining with bedinied to get "radiant charging" effect where is a cathode of LED connect to  + .  and i put capacitor 470 uf for storage.

@Amigo
Diode must be there, without diode the led will not light on.
Right, this schematic only for load 1 led and "charging" battery type, like NimH, Nicad etc
I try load more led in pararel, and drawn the battery source in certain time.
but if you put led on serial (I have tried with 5 leds) the battery source will not drawn.

@all
Actualty, i don't understand with this phenomena.  I don't have electronic bacground only hobby using bread board :(   and measurement tool using only WOA Digital Multimeter.
 
Maybe someone could explain to me what happend to it.

Until now the two circuit that i have build still light on and  battery power not drawn at all.


zon
« Last Edit: March 06, 2008, 03:55:52 AM by zon »

zerotensor

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #4 on: March 06, 2008, 05:50:21 AM »
I built a simple voltage-regulated driver circuit to run a pair of high-intensity leds off a single 9v battery for an art installation last November.  While taking down the show, I decided to leave the circuit running to see how long the leds would continue to glow.  Well, it's March now, and the leds are still lit.  Not super-bright, but still quite visible, even in broad daylight.  They have been putting out a flux of photons 24/7 for 4 months, and they don't seem to be getting any dimmer.

zon

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #5 on: March 06, 2008, 07:08:55 AM »
Now i upload the pict. It's look bright well


zon

innovation_station

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #6 on: March 06, 2008, 07:40:46 AM »
 :) ;) ;D


long road eh?


shift happins .......


ist

turbo

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #7 on: March 06, 2008, 07:58:09 AM »
why is this in the tpu thread?

abassign

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #8 on: March 06, 2008, 08:03:16 AM »
@zon

some questions:

1. Which is the absorption to the heads of the battery?
2. Which is the capacity, in mA, of the used battery?
3. From the photo, it seems a rechargeable battery from 1200 MA, is correct ?
4. Which type of LED have you used?

Adriano

zon

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #9 on: March 06, 2008, 08:59:46 AM »
@abassign

Question no 1,2 maybe related to my post at http://www.overunity.com/index.php/topic,3599.msg80317.html#msg80317
but i have not take the picture.
Source battery a full battery around 1.356 V
and target / charging battery or used battery around 1 V
After charging , source battery 1.252 Volt and target/charging  battery became 1.340 V

3,  Yup the battery is rechargeable type, NimH.
     Actually i don't know the capacity but if i use in load and compare to another battery, maybe   arround 900 mAh. The battery , i got from my CDMA fixed phone.

4,  Super Bright LED Clear White, 5 mm range IF 20ma - 30 ma, i get it from my friend, used led from him project running led but still working.


@marco

Sorry, it's a wrong thread.
before, i think Toroidal = toroid coil , after I read , i know different :(
Can i change it ? or admin can help us ?


zon

Koen1

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #10 on: March 06, 2008, 01:47:31 PM »
where did that "target battery" come from all of a sudden??

There is no "target battery" in the schematic you posted, nor do I see any in the pics you posted...

What you had was a smartly switched LED driver running off a battery,
but what you describe in this last post sounds like a bedini battery charger
("back-popper") circuit, where your dead battery gets recharged by the
other one...

please explain?


innovation_station

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #12 on: March 06, 2008, 04:30:52 PM »
 :)

NICE LINK

but im sure it can get much better lol

ist

renaud67

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #13 on: March 06, 2008, 04:39:58 PM »
:)

NICE LINK

but im sure it can get much better lol

ist
:D no doubt  ;)

Koen1

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Re: Single AA battery to light WHITE LED for long-long time
« Reply #14 on: March 06, 2008, 04:45:50 PM »
Hello,
look at that :
http://www.elektor-electronics.co.uk/magazines/2007/september/pr4401-led-driver.227959.lynkx

Hey thanks for that link Renaud! :)

So, it seems the trick is fast switching again..?
Well, interesting little circuit...
I am still a little bit puzzled as to how exactly 1.5V at extremely low milliamperage
(with a dead battery usually around the 0,001 to 0,01 mA) could light a LED
(LEDs usually need a couple of hundred milliamps at a couple of volts).
After all, even if you have a circuit that works the voltage up from 1,5V to
the voltage needed to run the LED, and let's use a very positive estimate of 3V for
discussion purposed, then the milliamperage delivered by the battery should
theoretically result in an even lower amperage, according to standard transformer
theory. And LEDs don't just emit light on voltage alone. They need the amperage
too.
Now it may be that the LED is in fact pulsed at the right voltage and amperage
at a high frequency, faster than the human eye can see, and this looks like
the LED burns continually...
But then still, it seems quite a neat trick to run a white LED off a dead AA battery...

Anyone for some more constructive insights? ;)