working with 3386 power stage and for the specific application gain resistor R for XY PCB is 22K
Since my preamp is passive i would like more gain 47K sounds fine but i dont know if has any stability restrictions
Can anybody help ?
i think it has a minimum gain for stability.
infinate gain is not possible naturally.
so i think you can got with a higher gain to account losses of a passive preamp.
there are 2 resistors setting the gain, not just one.
refer to the chip datasheet on information regarding how to calculate the desired gain setting resistor values.
Increasing the feedback resistor makes your amp more stable, not less. Nothing to be worried about with 47k other than possibly increased noise.
look at the datasheet.
The phase margin changes as the closed loop gain changes.
As you increase from gain = +20dB to gain = +30dB, the phase margin increases significantly. Above +30dB the improvement in phase margin is pretty low.
@ gain = +28dB, the phase margin is probably optimum for audio.
I believe that the many reports we see of Members saying that the 3886 sounds "right" when gain is around 27times is related to this "optimum audio phase margin".
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