Re: [Phys-l] led flashlights

[Bernard Cleyet <bernardcleyet@redshift.com>]

Speaking of diode LASERs,  I purchased an XBOX 360 external HD DVD  
reader for the diode -- as predicted by someone on TAP-L, it is  
disappointingly dim;   4.5 V. (30 mA*).  I can look at it directly  
and see the hour glass beam shape.  The system is very interesting  
optically, including a cemented double prism beam splitter, so the  
backwards compatible red LASER after the splitter uses the same  
optics.  The LASERs' platform has both fine adjustment in height and  
lateral movement (X and Z).

Now my question:  Does any one know how one can "play" The King Kong  
disk included in the box with out purchasing the console;  still > $300?


* I accidentally over potentiated it (unknown potential) for a few  
seconds at 80 mA.  Very bright then;  I suspect one could do this  
successfully w/ a proper heat sink. (I, hoping the diode is in good  
thermal contact w/ the case.)

bc thinks either sold at a loss or made in China by slave labour.

p.s. the detector may be useful too.

On 2008, Mar 05, , at 11:10, chuck britton wrote:

> Somewhere out there on the 'net is a simple circuit called the 'joule
> thief' (IIRC).
> It uses a small ferrite toroid (bead) to give the voltage boost  
> 'kick'.
>
> Described as squeezing a 'dead' single cell to run an  LED for hours.
>
> This circuit would make a flickering light - but the frequency is WAY
> higher than our ~30 HZ limit.
>
> I wouldn't use it on a sensitive diode laser without some post-
> conditioning.
>
> On Mar 5, 2008, at 1:17 PM, Brian Whatcott wrote:
>
> > At 08:49 AM 3/5/2008, you wrote:
> > > The newer led flashlights apparently have a voltage multiplier
> > > circuit along with a voltage regulator that boosts the battery

cut