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The programmation of Power Amplifiers are generally done by using an Input Attenuator.
Since playing operating current or voltage around active circuit will create nonlinear distortions, using step attenuator (voltage controlled or digital) at its input is technically good solution.
often you don't get exactly what you want.. there is always a trade off ... why can't u go for 5V or perhaps if you are restricted with 3.3V input.. why not to use a 3.3V to 5V voltage regulator
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