[sdiy] VCO Linear FM input - DC or AC coupled?

Ian Fritz ijfritz at comcast.net
Tue Jun 27 05:51:11 CEST 2023


Well, perhaps, if you are just considering a single frequency. But if you think in terms of a scale, then the factor of f from differentiating matters.  This is what makes the difference between FM and PM. (See any old radio theory text.) This was explained here by JH in the previous millenium.

Ian

> On Jun 26, 2023, at 2:35 PM, Neil Johnson via Synth-diy <synth-diy at synth-diy.org> 

> 
> Purists will pop up and say that when the modulating signal is a sine wave there is no difference between the two, and that's fine (lets ignore the pi/2 difference between sin and cos, eh?).
> 
> Neil
> 
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