Ha! 2am and my analog VCO works! Triangle core, wave-shaped sin, pulse, and ramp with 14 op-amps, 6 transistors and a lot of R. I see why people get into this synth thing now.
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Replying to
looks like a lot of fun! but how do you waveshape a ramp from a triangle with the same fundamental frequency?
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it looks like theres a little blip in the saw when the source triangle reaches its peak, does the waveshaper maybe take in both the voltage and the slope of the triangle as inputs?
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Replying to
The triangle to ramp shaping is done by switching between the triangle wave and its inverse and then mixing in the square wave for the DC offset.
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The little blip is right where the transistors flip the input to the inverse and the input square wave goes high. It looks like things are just a tiny little bit out of phase, resulting in a spike. I’m thinking I can filter it out, since the spike is very high frequency
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might be simpler to try to delay the square wave? you'll want to keep the higher harmonics of the saw.