Re: Anotehr Basic Q. re: a circuit


"Kris Krieger"

Sorry for another stupid question, but, I'm looking at this
http://www.maxim-ic.com/appnotes.cfm/an_pk/1750
and can't figure out whether I can ignore, or whether I need to add in
some
modification of something like this
http://www.instructables.com/id/S8Q5N9QFHTAIQK7/
where the first diagram says
" PWM Dimming 0 to 3.3HZ f>15KHz 0%=shdn 100%=20mA "

A clue would be appreciated - especially since I don't know whetehr they
mean dimming as in a Dimmer Switch on a lamp, or whether they mean
something entirely different...


** The CTRL input operates to dim the LEDs with a 0 to 3.3 volts variable
DC input, which can be created by filtering a PWM signal as shown or any
other way you like - eg with a 3.3 volt supply and a pot.




...... Phil


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