Simple DC booster circuit design

Discussion in 'The Projects Forum' started by FrankM, May 16, 2009.

  1. FrankM

    Thread Starter New Member

    May 4, 2009
    1
    0
    Hi all,

    I've looked through the forum but can't find what I need.

    I have a 7.2V battery pack (could be 8.4V pack at times) and need to fire a 12V relay.

    Has someone got a simple DC voltage booster circuit that could handle small variations in input but still deliver 12V output. Coil resistance is about 160 - 180 ohms.

    Frank
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Linear Technologies makes a boost regulator LT1073 that looks like it would serve your purpose. The 12V fixed version would be the one to use. Digikey has the device in an 8-pin dip package for $5.50 each in single-piece quantities.

    hgmjr
     
  3. heavyarms666

    Member

    May 16, 2009
    20
    0
    why do you need to boost it up? base on my experience, you can still make the relay work even the suply is 6V..
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Better to use a 6V relay rather making a boost converter.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I agree that if you have the option to change the relay I would get a relay compatible with the voltage and current you have available.

    The added circuitry needed for a DC to DC converter would take up more space on your board and would add needless complexity to the design.

    hgmjr
     
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