Was there ever any written discussion on the LM358 circuit on the Propeller BOE? Specifically U4 on sheet 4 of http://www.parallax.com/Portals/0/Do..._Schematic.pdf)
I've been trying to Google comparable circuits and can't quite find anything like it. It would seem that R9, R7 and C8 are forming the RC network for the Prop pin, but what I'm not clear about is what the purpose of C6 is and whether or not R5 has any effect on the signal.
I need schooling.