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Original question:

RC4559: Replacement for 4739 dual op amp (audio)

RC4559: We Planing to use RC4559 for MIC Ampilfer

Shubham patil
Intellectual 520 points
Part Number: RC4559

Hello Team ,

We are Planing to use RC4559 for MIC Amplifer.

We have two below question :

1. RC4559  is work as Preamplifier or Amplifier for MIC Input .

2. If We are using RC4559 then we can remove MIC BIAS CIRCUT .

Use attached Image for more reference.

  • Former Member
    0 Former Member

    Hi Shubham,

    The datasheet mentions use as a preamplifier and looking at the load resistances for the specified output voltage ranges, that seems to make the most sense unless you're running something like a 600-ohm headphone amp.  For a speaker amp, you may want to consider something else.

    The mic bias circuit does not have quite enough resolution for me to be able to read it.  However, it looks and sounds like it would be needed to bias the amp.  Why would you eliminate it?

    Regards,

    Daniel