how can i protect against overvoltage on 12Vdc

Discussion in 'General Electronics Chat' started by bobrock, Nov 30, 2004.

  1. bobrock

    Thread Starter New Member

    Nov 30, 2004
    3
    0
    I am tryin to find out how i can protect my LCD monitors in the car from an overvoltage . max voltage is 12V and im sure its 13.5 or so when charging.
    will a rectifier work ??? or a regulator of some type?? :blink:
     
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi,

    usually the LM7812 will do the trick, but if you very particular that the voltge does not exceed 12v, this regulator has an output tolerance of +/-5%. so chances are it would still exceed the 12v, but i don't think the 0.6v extra would affect your gadget. :)
     
  3. IanP

    New Member

    Nov 18, 2004
    5
    0
    The 7812 regulator is not very good for this.
    For it to give you 12V you need another 3V.
    You should rather use low dropout regulator LT1086-12 (V0ut=Vin+0.5) or switchng regulator such as LMLM2575-12.
     
  4. IanP

    New Member

    Nov 18, 2004
    5
    0
    The 7812 regulator is not very good for this.
    For it to give you 12V you need another 3V.
    You should rather use low dropout regulator LT1086-12 (Vin=Vout+0.5) or switchng regulator such as LM2575-12.
     
  5. bobrock

    Thread Starter New Member

    Nov 30, 2004
    3
    0
    thanks for your time guys ......... im gonnnnna research it and see where i can find them
     
  6. bobrock

    Thread Starter New Member

    Nov 30, 2004
    3
    0
    P.S. you guys are really smart ! thx again
     
  7. ram

    New Member

    Dec 3, 2004
    1
    0








































    you can use a32-tnt relay oto protect from over voltage more than 0.12 volts
     
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