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Thread: Diode question

  1. #1
    Member northdude's Avatar
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    Diode question

    What kind of diode do I need to put in a switch/trigger wire in my car lighting circuit to stop it back feeding when ignition is turned off cheers

  2. #2
    Member Ryan_Songhurst's Avatar
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    @gadgetman is probably the man you want to talk to..

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    Hey there @northdude, I'm sitting next to my 24VDC electrician mate and he said "oh yea, IN4004 or IN4007 or similar" (I have no idea what that means!)

  4. #4
    Member stretch's Avatar
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    They're about the most common diode there is. Commonly available at Jaycar.

  5. #5
    Member gadgetman's Avatar
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    Quote Originally Posted by deadidick View Post
    Hey there @northdude, I'm sitting next to my 24VDC electrician mate and he said "oh yea, IN4004 or IN4007 or similar" (I have no idea what that means!)
    +1

    Your typical power diode. Looks like a little black cylinder with a white ring round one end.
    There are only three types of people in this world. Those that can count, and those that can't!

  6. #6
    Member northdude's Avatar
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    Thanks guys I found out you can get a relay with a diode inside it probably easiest

  7. #7
    Member zimmer's Avatar
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    Quote Originally Posted by northdude View Post
    Thanks guys I found out you can get a relay with a diode inside it probably easiest
    The diode (if it is present) used in dc relays is usually to protect the coil and is called a freewheeling diode. It is generally wired in reverse across the coil and protects the coil when de energising. It is still possible though for reverse current to flow thru the coil. I had this issue when I upgraded my old HiLux lights to halogen bulbs. I installed relays at the lights but then had this annoying faint glow when everything was off. Traced the issue to bulb current flowing back thru the relay control circuit. I cured it by putting a diode in series with the relays. This is a stearing or blocking application which is probably what you are requiring. If your application is in the control circuit and not the actual lamps load either of the 2 diodes posted earlier will be OK. Rated @ 1 amp.

  8. #8
    Member gadgetman's Avatar
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    Quote Originally Posted by zimmer View Post
    The diode (if it is present) used in dc relays is usually to protect the coil and is called a freewheeling diode. It is generally wired in reverse across the coil and protects the coil when de energising. It is still possible though for reverse current to flow thru the coil. I had this issue when I upgraded my old HiLux lights to halogen bulbs. I installed relays at the lights but then had this annoying faint glow when everything was off. Traced the issue to bulb current flowing back thru the relay control circuit. I cured it by putting a diode in series with the relays. This is a stearing or blocking application which is probably what you are requiring. If your application is in the control circuit and not the actual lamps load either of the 2 diodes posted earlier will be OK. Rated @ 1 amp.
    +1

    Otherwise you will just be operating one relay with another one.
    There are only three types of people in this world. Those that can count, and those that can't!

  9. #9
    Member northdude's Avatar
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    OK thanks I want a blocking diode

 

 

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