My current project requires very low power consumption (remote control).

Here's the fun part:  There are 50 indepedant LEDs.  Hehe.  Currently,
they're hooked up to tri-state output shift registers.  I had planned on
using the PWM module to control intensity/power consumption.

Would anyone be willing to offer their experience as to the most efficient
PWM frequency/duty cycle for LEDs (Green/yellow).

The board space is very small (at best) and real-estate is hard to come
by.  I have therefore considered removing the current limiting resistors
and controlling intensity via PWM alone.  Any thoughts on this?

Finally, it was suggested that I control the power of some ICs by hooking
up their power lines to a small FET.  The Shift registers are the biggest
offender as far as power goes (everything else goes to sleep).  However,
they will be required to be able to provide ~45mA for the LEDs each
(worst-case).  Any recommendations as to a FET suitable for this app?
(small package, fairly high current, low voltage).

Your services have been invaluable thus far.  Thanks for all of your help.
I have been answering more often but for some reason, not all of my
postings make it up.

Sincerely,

Vincent Deno

--------------
Design Engineer
Theta Digital Corp.
www.thetadigital.com
denovj@email.uc.edu
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