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by lebuffon
50 days ago
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In my case it was around 1975ish.
There was no digital circuitry in signal paths then. If you are asking how the thread pitch motor controller was working I have no in depth knowledge but it would likely be an analog envelope detector. (simple RC filter/integrator would suffice) That would be rectified to make a DC control voltage and the control voltage would be used to modulate the power to the motor in an inverse fashion. ( more audio signal -> less power ) No digits would be harmed in the process. :) |
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