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DC Servos - sound-au.com
https://sound-au.com/articles/dc-servo.htm
A DC servo does pretty much eliminate any DC offset, but for most power amplifiers it's already low enough so as not to cause any problems. A DC servo is a very good idea if an amplifier is driving a transformer, but that's purely to ensure that there is no DC in the transformer winding.
Amazon.com: LM3886 DC servo amplifier board full ...
https://www.amazon.com/LM3886-servo-amplifier-independent-pre-finished/dp/B075M6W315
Product Highlights:1 DC servo circuit, extremely midpoint temperature, dc frequency response extends to 0HZ, low frequency and transient excellent details and official circuit outperformed Gang. 2-phase with a front-end circuit, with LM317.LM337 precision regulated. The most prominent feature is the design of three op amps transposon.
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]
Website of Wayne Stegall - Simple DC Servos
http://waynestegall.com/audio/simpledcservos.htm
Servo Design Procedure Choose break frequency of 159.155mHz for even 1sec time constant. Choose LF411 operational amplifier. Want first stage of servo at 0V DC bias to drive C 2S of second stage to -7.5V V GS = V T + sqrt(I D /k n) = -402.516mV + sqrt(2.01944mA/37.8643mA/V 2) = -171.575mV I RS = 2 x I D = 4.03889mA Calculate R terminated to -7.5V:
Audio Engineering Society Convention Paper
http://www.thatcorp.com/datashts/AES9198_DC_Servos_and_Digitally-Controlled_Microphone_Preamplifiers.pdf
an on-board DC servo amplifier to maintain the offset gain (defined as the gain between the input offset voltage of an amplifier to the amplifier output, also often referred to as the noise gain) of the preamplifier at a constant value regardless of the ac gain. This approach is an alternative to simply ac-coupling the
Audio Power Amplifier.
https://www.lcaudio.com/pdfs/xpcookbook.pdf
board. A selectable DC Servo kepps DC error within 5 mV, and an effective short circuit protection keeps Your amp alive, even under extreme overloads. A BIAS system where any thermal load is within limits to a supply voltage of +/- 100V ensures long operational life in any application. Millennium is also stable with low supply
DC Offset and DC Servo | diyAudio
https://www.diyaudio.com/community/threads/dc-offset-and-dc-servo.365825/
The DC servo output will change as is needed to maintain the main amplifier output at zero volts. It is simply correcting changes and drift that occur with temperature in the main amplifier. If that is what you mean then that is normal. One channels main amplifier just happens to be better balanced than the other, that's all. •••
What is a servo? - Universal Audio | Audio Interfaces
https://www.uaudio.com/webzine/2006/december/text/content2.html
The servo monitors the output of the forward op-amp and produces a signal which, when summed into the input of the forward op-amp, reduces or minimizes its offset voltage. The servo is connected in feedback, and functions in this case as an inverting integrator. The left half of Fig. 3 shows the connection of the servo, and the right half shows ...
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