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Electronics Matrix Orbital GPOs 5v to 12v Relay

Discussion in 'Modding' started by nry, 16 Jul 2009.

  1. nry

    nry Minimodder

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    I have a matrix orbital LK202-25-USB-FW which outpouts on the GPO's at 5v 20ma
    I need this to power a 12v relay.

    What's the best and cheapest way to do this, without damaging my display!
     
  2. nry

    nry Minimodder

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    bump?
     
  3. nry

    nry Minimodder

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    Anyone?
     
  4. capnPedro

    capnPedro Hacker. Maker. Engineer.

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    That's not really enough current to drive even a 5v relay (are you sure it's not 200mA?). So I'd suggest using a transistor to drive the relay.

    [​IMG]
    The transistor can be almost any suitable NPN transistor (I'm assuming you want this device to be active high, yes?) such as BC337-16 or BC549C or 2N5551.
    The diode can be any signal diode, but if you have a rectifier diode on hand that'll be fine too.
     
  5. const_

    const_ What's a Dremel?

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    microcontroller's output usually can supply a max of 20mA at 5v.

    capnPedro solution is best and should work with no problems. u could use any transistor capable of sinking or sourcing the current required to turn on that relay.. check your datasheet

    you could also use a MOSFET in place of the NPN if you would like to. & dont forget about the diode
     

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