how to convert 5v dc to 12v dc.

Discussion in 'The Projects Forum' started by akshat narang, May 27, 2010.

  1. akshat narang

    Thread Starter New Member

    May 27, 2010
    1
    0
    hello people.

    i have a velocity sensor working on 220v ac power supply and the output
    of this power supply is 5v dc. But the sensor for the system works on 12v dc. so i can use a regulator 7812 to convert it to 12 v dc to make the sensor functional. but the microcontroller kit(89C51) works on 5v dc.
    so how can i make this velocity sensor work????
     
  2. rickmartin

    New Member

    Sep 26, 2009
    27
    1
    Without knowing the current requirements for the sensor, I can't tell you exactly which dc-dc converter you need, but here is an example of what this company offers. I'm sure you can find one in their product line that will work for your application. http://www.trcelectronics.com/Cosel/sus1r50512b.shtml
     
  3. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    You could also try a non-inverting op amp circuit.
     
  4. whale

    Active Member

    Dec 21, 2008
    111
    0
    your data is incomplete, build it up.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Can you draw a schematic or block diagram of what you want to do?
    This will make things more clear and we will be able to help you better.

    Bertus
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    LT1073-12, Linear Tech. 5V in up to 90mA @ 12V out.
     
  7. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    The op wants to use a 12 sensor with a 5 volt microcontroller...

    B. Morse
     
  8. Norfindel

    Active Member

    Mar 6, 2008
    235
    9
    If you need to power something with 12v, and you have 220vac available, i think the best way is to build a 12v supply, assuming you have space left there to put the transformer. Of course, 220vac kills, so make sure you know what you're doing there.

    If the 5v section is low power, you could even change the 5v supply for a 12v supply, and use a linear regulator. It's not power-efficient at all, but at low power levels is probably worth it.

    You could also re-build a supply with a 6v+6v transformer, bridge regulator and capacitor, then regulate the rectified 6vca to 5vcc and the the rectified 12vca to 12vcc. Check for the regulator minimum dropout voltage, you maybe need a LDO regulator, or a transformer with higher output voltage.
     
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