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previous: David Manson Positive feedback is always bad? i ... -- 11/8/1999 7:40 PM

Re: Advanced feedback loop questions..

11/9/1999 7:08 PM
Don Symes	Re: Advanced feedback loop questions.. You're getting all this negative feedback about positive feedback for a reason. It's not _always_ bad. It's just very hard to control because it tends to exaggerate any instability or tendency to oscillation. An oscilloscope is a necessary tool here because of the near-certainty of ultrasonic oscillation that you will need to obviate. Do experiment, just protect the bejeezus out of the expensive parts and your work area (and yourself). Consider yourself both warned _and_ encouraged. We all wish you luck and success with this project - you're gonna need it.

11/9/1999 7:08 PM

Don Symes

Re: Advanced feedback loop questions..

You're getting all this negative feedback about positive feedback for a reason.

It's not _always_ bad. It's just very hard to control because it tends to exaggerate any instability or tendency to oscillation. An oscilloscope is a necessary tool here because of the near-certainty of ultrasonic oscillation that you will need to obviate.

Do experiment, just protect the bejeezus out of the expensive parts and your work area (and yourself).

Consider yourself both warned _and_ encouraged. We all wish you luck and success with this project - you're gonna need it.