Re: [ATM] How to make LED's work really good for KE Testing

["David Harbour" <scarab2@cox.net>]

Cary,

I sure like your note, here. For me, the information would be wasted, as I
am done (for life) pushing glass. Yes, it's sad, because I loved it. But
both my wifes' and my health will not let me do it anymore. I think all of
you guys have answered my criticisms adequately; what the heck- I just
didn't keep up with the times-

Dave


----- Original Message ----- 
From: "Cary Chleborad" <Cary@Chleborads.com>
To: <atm@atmlist.net>
Sent: Saturday, June 18, 2005 3:52 PM
Subject: [ATM] How to make LED's work really good for KE Testing


To answer the LED question for K.E. testing:

I built a LED driver circuit that was designed for driving white light LED's
with dimmer control.  I used a 10 turn potentiometer which gives really
really fine control over the intensity of the LED.  The circuit is also a
constant current device so the LED brightness is REALLY REALLY stable.
Also, the circuit is designs to suck every last drop of juice from a battery
pack - it milks the AA batteries down to less than .5 volts.  The upshot is
that you can run a single LED on this circuit for months on end - LITERALLY.

Using a LED with this control is the BEST thing I've ever experienced for
K.E. testing.  Beats an incandescent setup and even beats a laser fed fiber
optic setup (described in SPIE papers).

If anyone is interested, I'm sure I can scare up the schematic for this
circuit.  It's not really complicated, I found all the parts at a local
electronics supply and it took about 30 minutes to slap together on a piece
of perf board.

-Cary


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