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TOTAL noob question!

Discussion in 'General Electronics Discussion' started by Joe American, Feb 12, 2011.

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  1. Joe American

    Joe American

    Feb 12, 2011
    Hi, all, I am trying to build a DIY sous-vide cooker,(with no previous circuit-building exp.) and have hit a snag. The PID controller that I bought puts out 8vdc to the spdt relay, but the relay wont close unless it gets 9+ volts. I've looked for a lower voltage relay, and the next one down (so far) is 6V,

    Will I overload and kill a 6v relay with 8vdc?

    Is putting some kind of resistor inline an option?

    Do I have to scrap the PID and buy a different one?

    Any help is greatly appreciated.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    What is the relay switching? Is it switching the heating element?

    PID controllers often switch the load on and off quickly and VERY often. A relay may have a very short life.

    Consider a solid state relay.

    SSR's often will work from any voltage from say 3 to 32 volts.

    And good luck with your sous-vide cooker.
  3. Joe American

    Joe American

    Feb 12, 2011
    Hi, Steve, and thanks for replying,
    Yes the relay controls the heating element(s).

    Having no exp. with these things, is the nomenclature different with solid state circuitry?
    Last edited: Feb 13, 2011
  4. davenn

    davenn Moderator

    Sep 5, 2009
    have a look at this wiki link to see what they are all about
    As Steve says, they are ideal for switching hi voltage/current loads from a very wide variation of control voltage

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