Mike W wrote:

>any pointers on pulse driving LEDs ?
>Assuming a standard 10mA  5mm LED, what sort of repetition frequency and max 
>current would be suitable for a led that has a duty cycle of 8%, ( illuminated 
>for about 0.07 seconds each second ) are there any manufacturers guidelines 
>about this?
>  
>
There are many archives covering this subject in PICLIST.

Be careful however, as the action of switching generates RFI effects. My 
hardest FCC
projects have been those having multiplexed LEDs, especially if the LED 
arrays are
driven by FETs (very sharp, fast rise- and falltimes). Transistors 
switch slower and seem
to reduce this effect.

--Bob

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