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Question about analog oscillators


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Oscillators are not inherently unstable, but our hearing means we perceive pitch exponentially. So from one octave to the next means a doubling in frequency. If you want to control pitch on a VCO linearly (commonly 1 volt per octave), then you need an exponential converter for your keyboard or MIDI data. Most of these circuits have a temperature coefficient that is always present.

Digital oscillators just count a number of divisions of the master clock. Quartz resonates at a very specific frequency, and so it's much easier to count pulses this way. I think the SID uses a lookup table to derive the oscillator frequency.

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