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DC Servos - sound-au.com
https://sound-au.com/articles/dc-servo.htm
The DC servo provides a very large open-loop gain improvement over the amplifier circuit by itself. This is (by design) limited to sub-audible frequencies, and the additional DC gain provided by the servo's opamp is able to remove DC offset almost completely.
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.
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 - Audio Power Amplifier Design, 6th Edition [Book] 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 The 2C Integrator The 1C Integrator Choice of Integrator
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. power supply. High DC gain and low output offset are desired, other parameters are less critical, bandwidth can be low. The LF411is often chosen for this sort of application. Calculate RSto meet anticipated servo bias (i.e. terminated to -7.5V)
Audio Research D-250 II Servo power amplifier ...
https://www.stereophile.com/tubepoweramps/413/index.html
Audio Research D-250 II Servo power amplifier. The D-250 is the flagship of Audio Research's power amplifier range and, at 250 watts per channel, is the most powerful all-tube stereo amplifier currently available in the US. Under the circumstances, then, it is not surprising that it should also be one of the heaviest and largest.
Rythmik Audio • Direct Servo - how it works
https://www.rythmikaudio.com/DirectServo.html
The following steps are illustrated: 1. Amplified signal The plate amplifier receives a signal which is filtered on the pre-amp board to achieve correct integration. The signal from the preamp passes to the power amplifier which then sends the amplified signal to the voice coil of the driver. The amplified signal is shown above in red. 2.
Tweakers' Asylum: REVIEW: Borbely Audio Servo-50 Amplifier ...
https://www.audioasylum.com/reviews/Amplifier-SS/Borbely-Audio/Servo-50/tweaks/49025.html
Audio Asylum - Tweakers' Asylum: REVIEW: Borbely Audio Servo-50 Amplifier (SS) by ccd - Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ .
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