3.5, 4.5, 5.5, 6 volts power pack powered by 12v battery

Discussion in 'The Projects Forum' started by cedelive, Jan 27, 2011.

  1. cedelive

    Thread Starter New Member

    Mar 10, 2009
    3
    0
    i need a power pack that has 3.5, 4.5, 5.5, 6.5 volts(dc)
    ranges that will be powered by a 12 volts dc power
    i will appreciate if the circuit diagram is included
     
    Last edited: Jan 27, 2011
  2. Ctenom

    Member

    Nov 1, 2010
    59
    1
    Whats the expected current draw? a rotary switch and some voltage regulators should do the trick if you want to keep it simple.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    This crys out for a switching power supply, since a good design there will use minimum juice and create very little heat. 3V at 1A would be 12V @ 300ma at the battery.
     
  4. cedelive

    Thread Starter New Member

    Mar 10, 2009
    3
    0
    the input current is .92A/12v
    while the out put is between 300mA and 500mA
     
  5. cedelive

    Thread Starter New Member

    Mar 10, 2009
    3
    0
    input current is 0.92A while that of output is between 300mA to 500mA
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    I'm currently playing with SMPS regulators. In 6 months I may have something I could recommend.

    On the short term though...

    [​IMG]

    Properly heatsinked, the LM317 can handle 1 amp. The TO3 case style can handle 1.5A. It will get hot, very hot.

    You can use a series of resistors with switches across them to select voltages. Since you have 1V steps it should be easy.

    [​IMG]

    .
     
    Last edited: Feb 2, 2011
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