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Looking to modify tidu765 (single-supply electret microphone ref design) to a 3.3v supply.

Noah Klugman
Prodigy 30 points
Other Parts Discussed in Thread: OPA172, TLV9062, TLV6741, OPA377

Hello,

I have enjoyed reading tidu765. I am working on a design to try to detect a 50-100 hz signal based on this design reference.

Has anyone modified tidu765 to run on a 3.3v supply? Is this a bad idea? I can always add a boost to 5v, but am looking to minimize hardware. If this isn't a terrible idea, can anyone provide some good first steps / pitfalls that I should be aware of? 

Thank you!

  • 0
    TI__Guru 63225 points

    Hello Noah,


    The circuit shown in TIDU765 can be modified to work at +3.3V.  However, the OPA172 that was used in the design requires a minimum power-supply voltage of +4.5V, so you'll need to select a different op amp to work at +3.3V. 

    Consider the TLV9062, TLV6741, or OPA377 products.

  • 0 in reply to Collin Wells
    TI__Guru 63225 points
    I forgot to mention that you'll also need to reconfigure the gain and input/output ranges based on the reduced supply voltage.