RE: LED at 60 HZ? (was RE: Radio Shack Strobes)

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Original poster: "terry oxandale" <toxandale-at-cei-dot-net> 

There is a slight "persistence" issue, but not enough to keep this idea from
working. When I modified my motor for synchronous operation, I used an LED,
(much as you mentioned below) to verify my success in attaining the
objective. There was just enough of a cycle in brightness to watch a marked
spot on the motor's shaft to verify it was indeed synchronous. It's no
strobe by any means, but it will work. My only question as I performed this
test was whether a higher or lower voltage, when applied to the LED, would
increase or decrease the "persistence" for a given size or specific LED
rating.

(Un) Terry

  -----Original Message-----
From: 	Tesla list [mailto:tesla-at-pupman-dot-com]
Sent:	Tuesday, February 24, 2004 2:11 PM
To:	tesla-at-pupman-dot-com
Subject:	LED at 60 HZ? (was RE: Radio Shack Strobes)

Original poster: "Daniel Kline" <daniel_kline-at-med.unc.edu>

An engineering friend says a high-brightness LED on a
low-voltage transformer, like 6 Volts, connected through
a suitable resistance, should flash at 60Hz in sync with
the 60Hz mains. (50Hz for you all over there :)
It seems too easy to me...he thinks that the LED may have
a "persistence" issue. In other words, just because it
turns off quickly doesn't mean it stops emitting quickly.
Comments?
Thanks,
Dan K