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From Ken Stone’s CGS 48 VCO:

This VCO started out life as a replacement for the original VCOs in my ’73 Serge, so it replicates a lot of the functionality of that module. Of course there have been numerous enhancements to the design as well, making it right at home in a 1 volt per octave synthesizer. The core chosen is the well known Electronotes ENS-76 VCO Option 1 as used in the ASM-1, Modulus, etc. This core was an obvious choice due to the amount of information, lists of suitable substitutes and so on that are available on the web.

Modifications:

• Custom 1U Front-Panel-Express panel
• Sawtooth wave output is +/-5V
• Pulse wave output comparator DC coupled to sawtooth
• High quality parts throughout
• Some resistor value changes

Check out the CGS VCO Project page.