How to block current from going back

Discussion in 'The Projects Forum' started by alexxxx, Feb 16, 2010.

  1. alexxxx

    Thread Starter New Member

    Feb 16, 2010
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    Hi, I have a old Golf which has daytime running lights that run at 3.5volts, I want to run this cheap HID kit I purchased from eBay for $50 but it doesn't have enough power to power up the relay, so I added a 4700uf Capacitor, and it worked, but the car gives a annoying bulb out warning and the capacitor is giving power back to the car which could cause problems, so I wanted to only allow the capacitor to give power to the relay and block it from going back to the 3.5v source, and also at the same time I wanted to add a resistor to take the load from the car so the bulb warning light doesn't drive me crazy, I drew up an idea so you guys can see it.

    Is there anything I can do to stop the current? Or is this hopless?
     
    Last edited: Feb 16, 2010
  2. retched

    AAC Fanatic!

    Dec 5, 2009
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    A diode where you have the "Stop Here" mark.

    A properly rated diode will act as a "one-way valve" for electricity.
     
  3. alexxxx

    Thread Starter New Member

    Feb 16, 2010
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  4. retched

    AAC Fanatic!

    Dec 5, 2009
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    What is the specs on the lamps? Do you have a data sheet that shows current draw? If it is less then 3 amps, then they will work.
     
  5. alexxxx

    Thread Starter New Member

    Feb 16, 2010
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    No, I guess I have to get a multimeter and test it, thank you
     
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