CYGN-B

[Greg]

I removed the video. On second thought it seemed kind of tactless to publicize rude cycloids. The interesting part was seeing the image evolving with dials turning at the same time. The screen shot in the previous post shows the phase modulation function. I'm not sure how common the phase modulation function is in current cycloid generators. By phase modulation, I mean modulating the quadrature itself away from half Pi. I'll pick some more interesting cycloids from my log book and post evolution videos of those.

[mixedgas]

Variable phase is done by adding an OPAMP buffer or unity gain inverter each to 0' and 90' phases and hanging a single potentiometer off both outputs, and the wiper slides from phase to phase. There are other ways, such as vcf lowpass or bandpass , but this is a start.

Steve

[Greg]

Interesting. Yeah I see that now that you mention it. That is the phase shifting. For phase modulation, I guess analog multipliers would be needed?

Attached is a note on pm cycloids.