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DC Servos
https://sound-au.com/articles/dc-servo.htm#:~:text=Introduction%20A%20number%20of%20audio%20circuits%20use%20a,it%27s%20also%20potentially%20dangerous%20to%20loudspeakers%20in%20particular.
Audio/Servo Driver Circuit
http://omarshauntedtrail.com/Props/Prop%20Idea%20Files/Sound%20Ideas/audio-servo%20Driver%20Circuit.pdf
Audio/Servo Driver Circuit by Scary Terry This is a circuit I've developed to drive a servo using a variety of audio sources. My goal in creating this was for a relatively simple, inexpensive and reliable circuit that doesn't require programming a microcontroller for each individual movement. I've used several of these
audio-servo - Scary Terry
http://www.scary-terry.com/audioservo/audioservo.htm
Audio/Servo Driver Circuit. by Scary Terry . This is a circuit I've developed to drive a servo using a variety of audio sources. My goal in creating this was for a relatively simple, inexpensive and reliable circuit that doesn't require programming a microcontroller for each individual movement. I've used several of these circuits for more than ...
What is a servo? - Universal Audio | Audio Interfaces
https://www.uaudio.com/webzine/2006/december/text/content2.html
In the context of audio circuits, a servo is usually an active element used in feedback in order to null or reduce an amplifier's offset voltage. "Servos provide a sophisticated way to reduce offset voltages in audio circuits" Consider Fig. 1. On the left is the schematic for a differential operational amplifier (op-amp).
Please explain a servo circuit | diyAudio
https://www.diyaudio.com/community/threads/please-explain-a-servo-circuit.103703/
If you were viewing the main amp's output on an oscilloscope: The servo loop keeps the average value of the amplifier's audio output waveform centered, vertically, with respect to the horizontal axis (zero volts). Real circuits can sometimes look quite a bit different than the nice, neat block diagrams of feedback control systems.
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