Hi all

I need to be able to round off the square wave coming from the HWPM on my
PIC. The HPWM output is being used to generate sound. I am currently using
the standard 2 Rs + 2 caps which works in a fashion but is still rather
harsh. The freq range is potentionaly from 247 hz up to 12.5 kHz so an
active filter is needed (I think). Can any body point me in the right
direction?


In return for the favour I can post a rather neat interrupt routine for the
PIC 18 series that will take a series of MIDI codes and time statements in a
DB list and turn that in to a tune on RC2. Just give it a tune no, set the
start flag and away it goes all by it's self. It includes sub looping!


Many thanks


Tim

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