miércoles, 17 de marzo de 2010

Analog DCO

I want to share this circuit I design for a Poly Synth. VCO are not so good, in my opinion, for polysynths. this digitally controlled analog oscilator have the characteristic lineal response (not discrete) of VCO and controlled pitch without unwanted detunes among different voces.

The circuit is a constant current source that charge a capacitor. The time constant is controllated by R1 and C1. Q1 discharge the capacitor by uC when it's supposed to. The circuit needs a uC that generate the clock frequency and CV (16 bit prefered) because log response.

the uC has to simmulate portamento, pitch bender, note on/off, etc.

Please, test it before use!!

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