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The ChipSET - A Concept Chip Amplifier | diyAudio
https://www.diyaudio.com/community/threads/the-chipset-a-concept-chip-amplifier.56079/
Most opamps aren't unity gain stable and power opamps such as the ubiquitous LM-3875 require a minimum closed loop gain of 10. R2 and C1 are used to keep the opamp's noise gain at a minimum of 10 while the circuit has a signal gain of 1. The values of R2 and C1 will ultimately depend on the opamp used.
Unity Gain Power Amplifier Voltage Gain = 1 (0 dB) - where ...
https://www.diyaudio.com/community/threads/unity-gain-power-amplifier-voltage-gain-1-0-db-where-are-these-amps.296008/
Unity gain amps do have the advantage that, if one's doing a discrete BJT output stage, one can select smaller and therefore faster parts since output currents and rail voltages are lower and less thermal handling is needed. Means a higher fT for a given bias and correspondingly more potential for loop gain.
24 Best Opamp Amplifier Circuits
https://makingcircuits.com/blog/best-amplifier-circuits/
Inverting Summing Amplifier Circuit. The output of U1 is obtained by adding V1, V2, and V3, and multiplying by R1/R4, R2/R4, respectively. R1, R2, R3 are chosen as needed for desired benefits, R4 influences gain of all these inputs. Nonlinear Operational Amplifier With Temperature Compensated-Breakpoint Mosfet High Impedance Biasing Method Circuit
Audio line receiver impedance balancing using a 2nd diff …
https://www.eetimes.com/audio-line-receiver-impedance-balancing-using-a-2nd-diff-amp/
Figure 1: The “unity gain” audio line receiver with internal laser-trimmed resistors is a simple differential amplifier. Audio line receiver ICs, with laser trimmed on-chip resistors (such as the unity-gain THAT1240/INA134 or “-6dB” attenuating THAT1246/INA137) have excellent common-mode rejection, typically 90 dB.
CIRCUITS LABORATORY EXPERIMENT 9 Operational Amplifiers
https://classes.engineering.wustl.edu/jee2330/Exp09.pdf
Let us apply this algorithm to the simplest op amp circuit of all: the unity gain Figure 9.4: Operational amplifier connected as a voltage follower voltage follower of Figure 9.4. The input voltage is Vi,. The virtual short forces v-= v+ and, therefore, Vo = Vi. Hence, it is termed a voltage follower. Now you may be thinking
AN142 Audio circuits using the NE5532/3/4
http://noel.feld.cvut.cz/hw/philips/acrobat/8143.pdf
operational amplifier with less than 4nV/ √Hz input noise voltage. The NE5534A is internally-compensated at a gain of three. This device has been used in many audio preamp and equalizer (active filter) applications since its introduction early last year . Many of the amplifiers that are being designed today are DC-coupled.
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