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Original question:

[FAQ] How do I design Low Noise & Low Distortion Headphone & Small Signal Audio Amplifiers?

  • TI Thinks Resolved

LM833: Question bout audio input & output isolation

Intellectual 320 points
lifang lu

Replies: 1

Views: 149

Part Number: LM833

Hi,

We use LM833 to design the mic pre-amp as 'Single-Supply, Electret Microphone Preamplifier Reference Design' recommended,then the audio input(called device1) transmit to another device(called device2) which is the same design.

We can play normal audio from device2 output,but we also find same small signal from device1 output which can be heard when plugging in headphone.It's a serious problem.

We surmise the signal couple through GND,but don't know how to resolve it.

Do you have some suggestions about  audio input & output isolation？

Thanks a lot!

Intellectual 320 points
lifang lu
  • Intellectual 113245 points
    Ron Michallick

    Lifang,

    Is this the design? http://www.ti.com/tool/TIPD181

    Are two of these circuits in series (output of one connected to the  input of the other)?

    Is the noise on the headphone just plugged in or is the noise heard somewhere else?

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

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