[sdiy] 4046 VCO overclocking a PIC

Richie Burnett rburnett at richieburnett.co.uk
Mon Aug 24 19:29:39 CEST 2015

(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.


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