Electronics How to ... ?

Discussion in 'Modding' started by [DE]FreD_S, 3 May 2002.

  1. [DE]FreD_S

    [DE]FreD_S Certified Specialist of Awesomeness

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    Hi !

    How do I find out what resistor I have to use, if want to cut the power in a curcuit ? For example if I want to cut a 12V line to 7V ? What's the formula to use for this task ? Sorry for my crappy English, I have to get used to it again ...

    Cheers

    [DE]FreD_S
     
    [DE]FreD_S, 3 May 2002
    #1
  2. dakar

    dakar What's a Dremel?

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    I don't believe you can figure that out without knowing the amount of current required by what ever needs the 7v.

    Assuming this is for use in a puter... why not use both the +12 and +5 leads in a molex connector hook the + lead to your circuit to the yellow and the - lead to the red and viola +7v.
     
    dakar, 3 May 2002
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  3. viridius

    viridius What's a Dremel?

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    If you are planning to run a medium power device, the 12/5 trick isn't recommended. Use a 7807 regulator chip. Simple setup. 12V in one side, middle to ground and 7V out the other side.
     
    viridius, 4 May 2002
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