I have made by chance the experience that by a slightly raising of supply voltage -Vs (-Vs = -14 V / +V = 12.5V) for a OPA627bp a better more subjective sound can be achieved: are there any interactions if power rails are not equal?
Please check my circuit (simulated), its more like done by Gigawork DAC analog stage but with some minor changes.
As long as the modified asymmetrical power supplies do not result in the signal violating the input common-mode or output voltage range of OPA627 (both defined in PDS with respect to its supply rails), there should be no negative effect on the circuit overall performance.
Marek LisSr Application EngineerPrecision Analog - Burr-Brown ProductsTexas Instruments - Tucson
Ok, thank you.
One more question:
Is able a class a mode (OPA627bp), with one resistor (2.2k) between -14V supply rail and output of the op-amp (see my circuit in my first post; no additional buffer afterwards) cause an irreversible damage to the op-amp?
Since I done it and reversed back to normal operation without the resistor, bass becomes less prominent as usual......
I am not certain if I correctly understand your question; if the question is whether connecting 2.2k load resistor between the output and the negative supply could damage the OPA627, the answer is that it could not - the output of the OPA627 is protected by the internal short-circuit function that limits the output current to +/-45mA.
If this is not what you are asking about, please rephrase your question.
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