[sdiy] 4046 VCO overclocking a PIC

[Richie Burnett]

(I've used pin 12 rather than 11, and I can't remember enough about the
internals of the 4046 to say whether one is better than the other...)

One of the resistors sets the scaling (Hz/volt) of the VCO, and the other 
sets a static frequency offset.  For a musical oscillator with intended 
exponential conformity, I think you wouldn't want any of the frequency 
"offset" action.

-Richie,