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    I'd say should use, not must use :) For low...

    I'd say should use, not must use :)
    For low voltage circuitry many old style opamps are bad news as they require dual rail supplies - a modern
    true rail-to-rail audio spec'd opamp is a better...
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    Inductance is measured in henries, not farads... ...

    Inductance is measured in henries, not farads... 33ÁH perhaps?

    If you drive audio amp from a switch-mode supply (not recommended), then make sure its one with an
    ultrasonic switching frequency...
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