Denny Esterline wrote:
> I'm no expert on IR links, but the ones I've used had much lower than
> 50% duty cycles.
> It seems to me, that if you used a shorter on time, it'd make the
> looping and testing easier,
> not to mention letting you drive the LED harder.

Less than 50% duty cycle is often used in battery operated equipment to save
power.  It does *not* allow you to get more range for the same power, in
fact it is a little less efficient.  Assuming the LED will always be driven
full on and full off, 50% square wave puts the largest fraction of the input
power at the fundamental.  Any deviation from 50% increases power into the
harmonics relative to the fundamental.


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