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Compiler/LM386: Compiler/LM386

Martin V
Prodigy 10 points

Part Number: LM386

Tool/software: TI C/C++ Compiler

Hello,

I have a question about the LM386 Audio Amplifier IC. I didn’t see the information in the data sheet.

Between the Pin 1 and 8 i can regulate the gain from 20 to 200. But is there any formula to calculate the Gain for an specific value for example 100?

 

Thanks

Martin

  • 0
    Guru 140200 points
    Hi Martin,

    put a 10µF cap in series to a resistance Rg and connect this series circuit between Pin1 and Pin8. The gain of LM386 is very roughly then:

    Gain = 2 x 15k / (Rg x 1350 / (Rg + 1350) + 150 )

    But take into account that the manufacturing tolerances of the internal resistances can be huge, not so much the ratio of these resistances but their absolute values.

    Kai
  • 0
    TI__Guru** 114635 points
    Hi Martin,

    Welcome to e2e.
    The gain calculation could be obtained from the Schematic on the first page of data sheet. The comment above seems pretty good.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators