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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Filtering out distortion in a sine wave posted by Mushroom Soup on February 26, 2025 at 19:29:31:
A crazy idea, why don't you record 45 minutes of a 60 hz sine wave using software like Audacity saved to a WAV file at 16 bit resolution and play it back through a portable player/DAC as input to a motor drive amplifier. It will be an extremely low distortion signal. An old iPod or similar player would do the job. Even a CD player playing a CDR would work. You could record several waveforms each at a slightly different frequency if you wanted to vary the speed. I considered doing this when I was using a Tascam/ Papst capstan motor as an alternative to a problematic DC motor for my Teres turntable. Of course a typical AC motor is two phase (sine/cosine I believe) you actually need two driving signals, since the phase lag capacitor only approximates what the motor needs for smooth operation. One might need to play with the phase angle for the smoothest operation. The Papst motor I was using is actually a 3 phase motor, so the smoothest operation would be using 3 sine waves 120 degrees apart in phase angle. In the end I opted for a different DC drive solution (a Maxon motor drive controller).
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Follow Ups
- RE: Filtering out distortion in a sine wave - David McGown 18:40:51 03/06/25 (0)
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