Could someone please help me in understanding this circuit? =20
http://www.embedinc.com/pic/hal2.pdf

Particularly the part that takes the PWM wave from the PIC.

I made a test circuit of the part from the input through the 3 10K =
resistors to the capacitor and could see how it changed a square wave to =


-^--v--^--v--^

(like it wanted to be a triangle wave.  ^v^v^v^v   )

My problem is in understanding the function those components in the =
diagram have from the PWM output to the op-amp.  Specifically what the =
relationship is between the PWM coming out from the PIC and what is =
going on with the resistors and caps.

Help in understanding this is greatly appreciated!

Thanks,
Lindy



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=20

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