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



Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


Dave:

Try inserting more LED's in series --- 8-9 total.  This means they will fire
only when the voltage hits near 12 VAC on the very peak of the sine wave.
This might reduce the "smear" factor you are experiencing.

Best regards from AZ,

Dr. Resonance
 >
 > I did build a LED strobe with white high intensity LEDs.  The circuit was
a
 > 12V xfmr, a 1K resistor, and two strings of two LEDs back to back for
120Hz.
 > The smear of the pin was about 3" or so in length.  I think it is more
 > "firing time" of the LED that is causing the smear.  It does not fire just
 > on the peak but before it and for a while after it, or anytime the voltage
 > is high enough to fire the LED.  A circuit that would turn on at peak and
 > turn off again quickly should cause a freezing of the pin to occur.  Then
we
 > could make cheap high quality white LED strobes.