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Is this float switch circuit really all I need?

Discussion in 'Electronic Basics' started by MarkMc, Jul 26, 2007.

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  1. MarkMc

    MarkMc Guest

    I need to turn on a solenoid valve to let water in to a container
    whilst a float switch is down (n/c configuration).

    I was just going to put the switch and the solenoid in series with a
    240v AC supply.

    Is this really all I need or is this rather naive?

  2. John Fields

    John Fields Guest

    If the current and voltage rating of the switch is >= the voltage
    and current rating of the solenoid then that's all you should need.

    If it isn't, then you'll need to use the switch to drive a relay and
    the relay (in series between the mains and the solenoid) to drive
    the solenoid.
  3. MarkMc

    MarkMc Guest

    AFAIK, it is, so thanks!

  4. Jasen Betts

    Jasen Betts Guest

    That is almost exactly how washing machines fill to the apropriate
    level. (except they use a pilot tube pressure sensor)

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