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Electronics Some sort of transistor with 4 legs?

Discussion in 'Modding' started by relix, 22 Feb 2003.

  1. relix

    relix Minimodder

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    I'm wondering if there's some sort of transistor with 4 legs, that closes the connection to one pin if base is connected, and to another pin if base isn't connected. A bit like a switch that when you pull it to one side, it connects a wire to another wire, and if you pull it to the other side, it connects that same wire to some other wire...

    Anyone know if something like that exists?
     
  2. ZapWizard

    ZapWizard Enter the Mod Matrix

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    Hey sounds like a good product,
    But I don't think that exists.
    You can use two transistors, one NPN and the other PNP to do this though.

    I used that for my Alternating IDE circuit on my website.
    The two switch using the same signal.
     
  3. relix

    relix Minimodder

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    Okay, I'll just use 2 transistors then :D

    Thanks zap, you always have an answer :clap: :rock:
     
  4. relix

    relix Minimodder

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    w00t it works from the first time! :D

    it does this: when I connect the base through a resistor to +, the red LED (connected to a PNP transistor) lights, when I disconnect the base, the red and green transistor lights, although dimmer, when I connect the base to ground, the green LED (connected to a NPN transistor) lights.

    Why do they both light when the base isn't connected? I thought they just wouldn't light then?
     

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