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Quick and easy driver :D

P

ped

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Nov 25, 2008
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Hi guys,

We sell these 1x AA emergency cell phone chargers, and i thought...if the can charge a phone (at 5v) from 1.5v, then it must be some kind of buck/boost device..

And sure enough..

2yjzbx4.jpg


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jz906a.jpg


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dn24uh.jpg


Ok its not megawatts, but with a good lens you could get wll over 200mW!

And I should imagine they would power a 405nm or LOC perfectly.
And you get a nice ali host as well that someone could make a "lid" for.

Oh, and its under 5 bucks :D




DealExtreme: $4.16 Aluminium 4-LED Flashlight + Emergency USB Charger with Cell Phone Adapters (1*AA)
 





Im going to run an LOC on it tomorrow and get some voltage/current figures....and a power reading of course :)
 
So you're using this DCDC converter AS a driver? They're meant to output 5V. They will undoubtedly sag under high load, but there will probably be quite a spike at startup.
 
160 mW is in the 350 mA range. I wonder if the boost has a resistor controling the current? The circuit might not take much more current but as a boost, it might accept a LiIon cell.

HMike
 
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Cyparagon said:
So you're using this DCDC converter AS a driver? They're meant to output 5V. They will undoubtedly sag under high load, but there will probably be quite a spike at startup.
Click to expand...


yeah like i said i'll gather more data tomorro, maybe even break out the scope to check for spikes.

EDIT

Arent all drivers dc-dc convertors? :)
 
Last edited:
I bought a few of those about 6 months ago for
the same application/experiment... but never found
the time to test them..
Thanks for the legwork...:beer:

Jerry
 
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My kenometer upgrade has arrived now as well so i'll be able to plot time Vs Pout as well.
 
Looks interesting.
I have made no progress on my joule thief to LM317 experiments, this might be a simpler solution. :)

(A cap across the output would likely extend the diode life)
 
Toke said:
Looks interesting.


(A cap across the output would likely extend the diode life)
Click to expand...

Aye, was thinking that, im still in the "experimental" stage atm , so the modifications will be done once i have some figures.
 
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