SPDT and DPDT switch question

Discussion in 'General Electronics Chat' started by danger, Oct 22, 2010.

  1. danger

    Thread Starter New Member

    Sep 5, 2010
    SPDT and DPDT

    I will be using 1 of each of these switches for a DIY project and with so many different options out there I am wondering if someone can help me decide what to purchase.

    This is a 9V DC circuit. They will be panel mounted with a soldered connection. Beyond this I am not sure what specs are important. Anything else I need to be aware of? Is there a less expensive reliable manufacturer out there someone can recommend? Any help would be greatly appreciated.
  2. Jaguarjoe

    Active Member

    Apr 7, 2010
    Less expensive than what? "All Electronics" has all kinds of switches cheap. Being a 9v project, voltage is not a concern. Make sure the current rating of the switches exceed the actual current flowing through them.


    Aug 15, 2010
    Well, as previously stated, the only other important rating to know is current. A very conservative current rating for the switch is double what the load uses. Knowing the kind of switch you want to use will help with narrowing down your options. I would go to digikey.com, click on Product Index, go down to the Switches section and click on the type of switch you want to use. From there you can specify SPDT, DPDT, current and voltage ratings.
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    Or you can just go to Radio Shack, most of them still carry a fair amount of switches.
  5. PackratKing

    Well-Known Member

    Jul 13, 2008
    Choice of poles and throws, hinges on how many individual circuits you are feeding or backfeeding through them.
  6. Audioguru

    New Member

    Dec 20, 2007
    Most switches are made to switch high voltages and high currents. Their contacts are silver. When the silver corrodes (turns black) then the high voltage or high current makes a spark that breaks through the corrosion.

    But when the contacts corrode they will not switch a low voltage or low current because there is no spark.
    So I use gold-plated contacts on a switch for low voltage and low current because gold doesn't corrode. The price is the same.
    I also use gold-plated IC sockets.