To nudge the pitch in an analog way
![4883](https://cdn.xingosoftware.com/elektor/images/fetch/dpr_1,w_200/https%3A%2F%2Fwww.elektormagazine.com%2Fassets%2Fupload%2Fimg%2Fpublic%2Foriginal%2Fnudge-f-doppler-20230207171017.jpg)
Compress (stretch) a given fixed-frequency squarewave along the time axis, resulting in an increase (decrease) of frequency. The design presented here is meant especially for a really smáll change: “the pitch is núdged” - in an analog way. This can find application in music synthesizers / keyboards. This circuit does nudge in the positive or negative direction (just like the Doppler effect) – by simply swapping two connections in the circuit.
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