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555 piano

Small sized 555 timer based piano.

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Main goal of this project has been creating pretty designed 555 based piano in small form-factor. Many 555 piano are using 9V battery for supply. I use CMOS timer and for timer need only 3V supply.


First prototype PCB

All schematics and BOM list you can download from GitHub

Also thx to @oshpark who gave me help for producing PCB for my project with high quality ;)


  • Frequencies

    Alexander Ryzhkov09/15/2017 at 20:07 0 comments

    # of key1/2 PeriodFrequency realFrequency 
    1703uS  711HzC1046Hz
    2730uS 685HzB5  987Hz
    3787uS 635HzA5  880Hz
    4850uS 588HzG783Hz
    5927uS539HzF698Hz
    6967uS 517HzE5  659Hz
    71.04mS 480HzD587Hz
    81.15mS 434HzC5  523Hz

    Need to replace resistors and reverse buttons position.

  • DIY kit​

    Alexander Ryzhkov06/19/2017 at 19:19 0 comments

    Diy kit for friend


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