Other Parts Discussed in Thread: OPA134, TPA6120A2, OPA828
I would like to use the OPA627 and the OPA134 in optimal wiring (non inverting) in front of a TPA6120A2.
Unfortunately, despite an intensive search, I did not find any information about the configuration or circuitry used for the OPA 627 and OPA134 to achieve the optimum result from low noise and good stability.
In front of the OPA is a 50k potentiometer and a coupling capacitor (1uF KP or 40uF / 80V bipolar electrolyte), as shown in the diagram.
At the output comes a TPA6120A2 as shown in the data sheet under 10.2.1.2.1 (with the 50R resistor between OPA and TPA6120A2).
In the current circuit, all 3 resistors have a value of 10k.
A gain of 1-3 would be enough.
The supply is +/- 15V.
The circuit is to be operated at the outputs of conventional audio devices (DAC, s, CD player).
With which wiring would an OPA627 and OPA134 (the wiring for both OPA do not have to be the same) achieve the best performance from lowest noise and best stability under these conditions.
Is R1 needed? Or does a resistance to ground have to be inserted before C1?
Thank you in advance for the help