[sdiy] New Vco

[jhaible at t-online.de]

René Schmitz schrieb:
> Hi all,
> 
> I've put up a new VCO design. Based on a 4069 hex 
> inverter  
> and tree transistors. No difficult to obtain tempcos and 
> yet  
> compensated.
> A more detailed description and some constructional hints 
>  
> are located at: 
> http://www.uni-bonn.de/~uzs159/vco4069.html 


Nice little oscillator, René !

How's the tracking for higher octaves ?
The discharge current from the 4069 cannot be very large,
but then again the output resistance of the "integrator"
inverter may do some compensation ...

I've once designed a little EMS-style variable Sine shaper
around a 4069 - maybe some time we'll have a CMOS-only
little synth ! I'll take a look if I still have the drawing.

JH.