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12 volt dc

  1. A

    Transistor with resistance controlled by the amount of input power

    Hi, I am modding my computer motherboard and I have a RGB led strip header. But the fact is it can only supply 1 Amp of current through the 4 pin header. I want to be able to use a variable resistor to control a 12v line straight form my power supply that can provide power for a bigger LED that...
  2. E

    Need help .

    Hey gang. New to this site, looking for advice. I've got an old volt meter from hikok that was made specifically for Packard auto. Both names appear on the volt meter. I would like to design a circuit powered by a 12v battery that would make the voltage spike or pulse making the needle pulse...

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