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DC Servos - sound-au.com
https://sound-au.com/articles/dc-servo.htm
2 - Inverting DC Servo. In Figure 2, there is an amplifier circuit (shown simply as 'Amp') and a DC servo circuit (shown as U1). If the amplifier shows any sign of DC at the output, this is integrated by U1, and that signal is applied to the amp's input to correct the offset.
Website of Wayne Stegall - Simple DC Servos
http://waynestegall.com/audio/simpledcservos.htm
Choose servo break frequency of 159.155mHz for even 1sec time constant. Choose op-amp. Any will do that will operate on the chosen power supply. High DC gain and low output offset are desired, other parameters are less critical, bandwidth can be low. The LF411 is often chosen for this sort of application.
What is a servo? - Universal Audio | Audio Interfaces
https://www.uaudio.com/webzine/2006/december/text/content2.html
However, the DC offset at the output of the circuit will be equal to the input offset voltage of the servo. Typically, this provides a marked decrease in offset voltage. The servo op-amp does not need to have exceptional bandwidth, slew-rate, input impedance or output impedance, so an op-amp with a very small offset voltage can usually be chosen.
Chapter 23 The Design of DC Servos - Audio Power …
https://www.oreilly.com/library/view/audio-power-amplifier/9780240526133/032_9780240526140_chapter23.html
Chapter 23 The Design of DC Servos DC Offset Trimming DC Offset Control by Servo-loop Advantages of DC Servos Basic Servo Configurations Noise, Component Values, and the Roll-off Non-inverting Integrators … - Selection from Audio Power Amplifier Design, 6th Edition [Book]
Audio Engineering Society Convention Paper
http://www.thatcorp.com/datashts/AES9198_DC_Servos_and_Digitally-Controlled_Microphone_Preamplifiers.pdf
2.2. DC Servo In order to overcome these shortcomings, many designers choose to employ a dc servo amplifier to maintain constant dc offset gain. This usually takes the form of an integrator circuit with its input monitoring the preamplifier output, and its output driving the preamplifier input as shown in Figure 3.
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