0 to 11 for one octave then jumps to 16 for the next octave (see coding chart below). Some guestimation was needed when developing these sections of the circuit, as my original Serge VCOs are potted in epoxy. This is because the keyboard coding runs from. The very top of the circuit diagram shows the inverting/non inverting scaling mixer as used in the original Serge VCO, while the bottom left hand corner shows the Saw to "Sine" converter from the same source.
#SCHEMATICS FOR A OSCULATOR SYNTH FULL#
note (NS AN-72), and will not cover the full range available from the VCO core itself. The sub-oscillator is based on that from an LM3900 app. Take the time to look at the ASM-1 page where you will find suggested alternates for various components such as the dual transistor and the FET. Click here for a larger version of this diagram. Oscillators or VCOs (Voltage Controlled Oscillators) are sections within synthesizers designed to produce periodic voltage fluctuations at a specified frequency rate. I have no doubt there will be more variations as the module continues to evolve. Please also note that there have been many variations of this PCB, and I no longer have copies of the artwork of the older variations. If you require an accurate sine wave, this module is unsuitable for your purposes.
As this is the recreation of a module that had such a waveshape, this is appropriate. There is a significant glitch in it that is almost impossible to trim out. Note that the "sine-like" waveform is not a pure sine wave. It also includes a simple sub-oscillator for those who wish to experiment with that. It has sawtooth and pulse/square outputs, as well as a waveshape that is variable between sawtooth and a "sine-like" shape, and a fixed "sine-like" output too. inputs and scalable/reversible CV inputs. It has AC and DC linear CV inputs as well as 1 V/oct. 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. The schematic has been updated to reflect the correction. 21-05-2019: Thanks to Tyler for pointing out that R21 should go to -12V and not to ground, the sine-shaper won’t function otherwise. The core chosen is the well known Electronotes ENS-76 VCO Option 1 as used in the ASM-1, Modulus, etc. 16-07-2018: Some updates on the schematics. Of course there have been numerous enhancements to the design as well, making it right at home in a 1 volt per octave synthesizer. 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.
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