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Discussion in 'Electronic Basics' started by Curt Dahlen, Jan 12, 2004.

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  1. Curt Dahlen

    Curt Dahlen Guest

    Im building A timer and i want to make 1,-4,5,6min intervals by a switch
    to select different resistors, But I'm not sure the right way to figure
    out the formula for time, or is this right and its just not that acurate

    timing = 1.1 C1 X R1

  2. You need to provide more information. The formula depends on the type of
    timer you're using. If you're using the 555 as a monostable, then the above
    formula is correct. Select a C and vary R to get the timings you want. Then
    measure with a watch to verify and tweak as necessary.

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