Voltage regulator – cap. discrepancy

Home Forums Botanicalls Community Voltage regulator – cap. discrepancy

This topic contains 0 replies, has 2 voices, and was last updated by  Rob Faludi 8 years, 6 months ago.

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  • #1457

    lscarmic
    Participant

    The Botanicalls schematic on SparkFun shows a 100u an a 10u on the in and out of the voltage regulator, respectively. The datasheet for the 3.3V voltage regulator (see Figure 4 at http://www.sparkfun.com/datasheets/Components/LD1117V33.pdf) shows a 100n and 10u on the in an out, respectively. Can anyone explain the discrepancy? Thank you!

    LC

    #1806

    Rob Faludi
    Keymaster

    These are just bypass caps, so the values aren’t too critical. The larger cap will filter out lower noise frequencies, possibly most useful since there’s generally going to be a regulated A/C power supply connected to the regulator. However feel free to substitute other values if you prefer.

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