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Time vs voltage circuit

Discussion in 'Electronic Design' started by [email protected], Mar 31, 2007.

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  1. Guest

    I need help in order to make a circuit which will do the following:
    Measure the time a voltage is applied (or switch is closed) and
    convert the time to an output voltage (linearly). Also measure the
    time when another switch is closed (or voltage applied in another
    circuit) and linearly convert this time to REDUCE the same output
    voltage. Is there an expert out there who can give me advice on how-

  2. D from BC

    D from BC Guest

    How about...
    Use a constant I source on a cap for increasing V with t.
    Use a constant I sink on the same cap for decreasing V with t.

    D from BC
  3. Guest

    Over what sort of period? There are well-established techniques
    embodied in off-the-shelf time-to-voltage converters for microsecond
    to nanosecond time scales.

    If the times involved are in the seconds to milliseconds range, a dumb
    microcontroller is a much cheaper solution.
  4. MooseFET

    MooseFET Guest

    A gear motor and a 10 turn pot.
  5. A PIC, of course.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  6. Guest

    digital up-down counter with an R network on the output's doing the DA?
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