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LM4810: how to set the gain?

Frank Buss
Prodigy 110 points
Part Number: LM4810

I plan to use the LM4810 for an audio amplifier (5 V supply voltage). How can I set the gain from -15 dB to +3 dB? I guess a log stereo potentiometer would work, but can I use it in the feedback path? Or should I set a fixed gain of 3 dB and then use it as an attenuator somewhere at the input? 

  • 0
    TI__Guru* 84915 points

    Hi, Frank,

    The gain is determined by the relation Rf/Rin. So, any modification on the resistors values will be traduced in a gain modification. Your idea of the potentiometer in the feedback path must work. However, I recommend to ensure that the potentiometer is selected to cover all your gain range (-15dB to +3dB). A resistor in series with the potentiometer could work to ensure that the minimum value of the array gives -15dB and the maximum results in +3dB.

    I hope this makes sense for you. Please let me know if you have additional questions or comments on this. We will be glad to help you.

    Best regards,
    Luis Fernando Rodríguez S.