pwm supply or other for leds ?

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hi , i have 19 rows of   four , 10mm white leds.  would it be better to
power them  straight from dc or a pwm supply ?
thanks

 mark k



Re: pwm supply or other for leds ?
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Straight from DC - ensure you have the correct value series resistance in
circuit. You may have to series/parallel their connection to the DC
depending on your DC supply voltage and the rating of the LEDS.
PWM if you want to vary their brightness.



Re: pwm supply or other for leds ?
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A constant current supply is best, then you can run them at an optimum
known current.
You can use an LM317:
http://users.pandora.be/davshomepage/current-source.htm

Usually no need for a PWM supply, but you haven't given us any
application info to work with...

Dave.

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