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ADG408 and 409 multiplexer

Hello, i want to replace the multiplexers in audio devices with these types. The old ones are CD4051 and 4052 CMOS. Yes, i know they are not pin compatible, but this won´t be a problem. The ADG type should have some advantages as low noise and the cut-off before switching. 

Now, i want to know if i have to change the design for the following buffer stage or could it be used like for the CD types? I have not found any sample circuits or plans for audio usage...

I would be glad if anyone has some tips or informations for me

Thanks 

Tom

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  • Hi, Tom.

    Could you share more details about this application? Information like voltage range, supply voltage, operating frequency and a schematic will help us better understand your question.

    Yours sincerely,

    Igor.

  • Hi Igor,

    the application is a vintage amplifier from DUAL. They have built two really heavy amps called RC440 and RC441. After this they haven´t designed anymore amps. Meanwhile only the name exists. They use the CD4051 for switching the audio inputs, the standard volume poti has been changed to two 4051 for dB multiswitching, as balance, bass and treble too.

    This chips operate with +/-7.5V regulated; the op-amps as buffers with +/-15V. The unregulated supply is +/-18V here. Frequency is from 20HZ to 20KHZ up; the usual audio range.

    I have added a snip of the input multiplexer.

    Regards,

    Tom

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  • Hi Igor,

    the application is a vintage amplifier from DUAL. They have built two really heavy amps called RC440 and RC441. After this they haven´t designed anymore amps. Meanwhile only the name exists. They use the CD4051 for switching the audio inputs, the standard volume poti has been changed to two 4051 for dB multiswitching, as balance, bass and treble too.

    This chips operate with +/-7.5V regulated; the op-amps as buffers with +/-15V. The unregulated supply is +/-18V here. Frequency is from 20HZ to 20KHZ up; the usual audio range.

    I have added a snip of the input multiplexer.

    Regards,

    Tom

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