02-15-2022, 02:38 AM
(02-14-2022, 12:38 PM)Jens Noritzsch Wrote: I thought that with the dual tone generator it is a fixed frequency and a sweep – brief frequency range, of course. It required certainly more though. Thanks for your important remark…
I don't have equipment to measure how slow you can make the beat but I can easily hear 0.1 Hz beats at both high and low component frequencies.
I can also see the loudspeaker membrane (and neodym magnet as in picture) vibrate at very low frequencies like 5 Hz, and see the beat from component 5.9 Hz + 6 Hz signals.
So I guess there are two sweeps to program, one where the beat frequency is fixed (e.g. 0.5 Hz to surely be below the base frequency of a given mass+spring) and the other where beat frequency goes from let's say 0.5 to 100 Hz. The former (fixed) to find the frequency where you get the strongest magnetic field to pull the mass+spring and the latter to get the what you want: the full resonance spectrum of a given mass+spring.
Didn't have time to send the beat signal through the diode bridge yet.
Best regards.
//Erik