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Dorcy 1xAAA Blu-ray mod

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ChuangTzu

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I've been curious about this single AAA powered blu-ray flashlight mod: ledmuseum.candlepower.us/eighth/blu-ray.htm featured at the LED museum and available on ebay for ~$150.

Does anyone know what kind of modifications have been made to the LED driver circuit to enable the blu-ray diode to run on 1.5V?  Has anyone reverse-engineered one?  [I just heard back from Craig at the LED museum that the driver in his came potted in epoxy and there is no way to examine it. :(]

I have a Dorcy 1xAAA in front of me and I plan on making a similar modification as soon as my diode (finally) gets here.  The board is currently set up to feed the LED 1.3V when powered by a full 1.5V from a battery.  Not sure what the current drain is but the LED museum says the current drain on the battery is 243mA.  The diode is, of course, seeing something less though.
 





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ajohnson

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Weird, I thought the Dorcy flashlights that run off a single AAA or AA battery have a voltage inverter in their driver, so the LED sees 3v or 5v
 
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ChuangTzu

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This may be the case.  The board is tiny so it's possible that I didn't get my test leads in exactly the right spot.  I'll double check right now....
 
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ChuangTzu

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Looks like the diode is seeing 1.16V now that the battery is down to 1.4V. I'm measuring at the solder patches marked "LED+" and "LED-".
 
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ChuangTzu

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Well, I pulled the LED off and measured the voltage at the terminals. It's the same as the battery: 1.5V. This means the circuit will not regulate the current up to the point where it raises the voltage above that of the supply, even for heavy loads. It will possibly down regulate it. So how does he get it to supply 4-5V?
 
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ChuangTzu

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No one has any ideas? Or even wants to take a guess?

I guess I'll just have to clear the board and try to fit my own driver on it. It's tiny.
 
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BlueFusion

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you can get circuits that totally double voltage. I actually know of one design, a diode charge pump inverter using a hex schmitt-trigger chip. if you don't know what that means, go ger a degree in electronics or something :p lol. essentially it doubles whatever voltage it's given, with 2 capacitors, by charging one with the voltage positively and one negatively then putting them together. bingo double voltage. sorry i dont know more than that.

I am gonna etch some PCBs soon, (tomorrow) so I may make up one small enough to fit in a torch and see if it works.
 
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ChuangTzu

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wooooooolazer said:
Maybe he made a new driver for it?

...lazer.. ;D ;D ;D
Click to expand...

In the writeup at the LED Museum, it states that the original driver was modified. I was assuming that was true for the sake of discussion. Of course, you may be right.
 
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ChuangTzu

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BlueFusion said:
you can get circuits that totally double voltage. I actually know of one design, a diode charge pump inverter using a hex schmitt-trigger chip. if you don't know what that means, go ger a degree in electronics or something :p lol. essentially it doubles whatever voltage it's given, with 2 capacitors, by charging one with the voltage positively and one negatively then putting them together. bingo double voltage. sorry i dont know more than that.

I am gonna etch some PCBs soon, (tomorrow) so I may make up one small enough to fit in a torch and see if it works.
Click to expand...

Of course you can build DC-DC converters that input and output any voltage.  I don't know about a hex schmitt-trigger chip but I guess I'll either have to build a DC-DC circuit or modify the battery compartment to hold different batteries.   :)

I have a MSc in Physics, btw.  :p
 
Spyderz20x6

Spyderz20x6

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would a blu-ray diode be able to run on 3 or 2.4 volts :-? :-? :-?

or only 5 volts... I REALLY NEED 2 KNOW!! WOULD IT WORK WITHA MINIMAG SORT OF MOD??? OR A DORCY 6 VOLT MOD??? u can email me at [highlight]spyderz20x6@hotmail.com[/highlight]
 
Hemlock_Mike

Hemlock_Mike

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The Dorcy I got runs off a CR123. I'm using a LiO cell charged to 3.6 volts.
My driver put out a little over 6 volts no load so I added a 78L05 regulator in there and a resistor to the diode. Since my BR diode is set for about 35 mA, the boost circuit seems to hold its output voltage.

Mike
 
Kenom

Kenom

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OK dancing spidey is just WRONG!! You do need a minimum of 4.5v to run a bluray.
 
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