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    cal918's Avatar
    cal918 Posts: 1, Reputation: 1
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    #1

    Oct 26, 2007, 12:49 AM
    Circuit Design
    Where do I start if I need to make a scematic to create a circuit that has a 100 ohm resistor and it gives 3 1/2 volts - plus or minus 5%. I can use as many 1.5 volt batteries as needed.
    colbtech's Avatar
    colbtech Posts: 748, Reputation: 66
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    #2

    Oct 26, 2007, 01:54 AM
    Are there no other components?
    Tj3's Avatar
    Tj3 Posts: 3,028, Reputation: 112
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    #3

    Oct 27, 2007, 08:45 AM
    Quote Originally Posted by cal918
    Where do I start if I need to make a scematic to create a circuit that has a 100 ohm resistor and it gives 3 1/2 volts - plus or minus 5%. I can use as many 1.5 volt batteries as needed.
    That is problematic since it may be hard to find 1.5 volt batteries that are +/- 5% to begin with. It is also not clear if you are saying that you can only use one resistor or more than one. If more than one, I would use 3 batteries and a voltage divider circuit on the third battery using the resistors to bring it down to a half volt, and then put the three in series to give me 3.5 volts.
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