4069 VCO
The 4069 VCO was designed by René Schmitz, schematics can be found on
his site.
I really like the 4069 VCO of several reason:
- It's simple to understand, thus debug
- It's cheap
- It's stable enough
My version of the 4069 vco contains a slightly modified boost stage for the saw output
as shown to the right, i have this here because it's incorporated in the breadboard layout
of the 4069 vco found below.
>> 4069 VCO Breadboard layout (GIF format)
>> 4069 VCO Breadboard layout (PCB format)