voltage doubler in max1044

Discussion in 'The Projects Forum' started by ne89, Oct 31, 2006.

  1. ne89

    Thread Starter New Member

    Sep 25, 2006
    9
    0
    hi...all,

    I used MAX1044 to make +/- 9v from 9v single polarity.. but I need +/- 18v to operate instrumentation amp.
    Could you help me how to make voltage doubler of MAX1044 in dual polarity?
    Thank you.

    ne89
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    Chances are good that you don't need all that voltage. Usually, the +/-18 volts is the maximum allowable voltage on an op amp.

    Unless you know the signal of interest is going to be very large, the +/- 9 volts might be enough for your purposes. For instance, a signal that gives a 2 volt output will be fine with no more than +/- four volts on the supply rails.
     
  3. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
    Can you post a schematic of your circuit in a format other than .doc?
     
  4. ne89

    Thread Starter New Member

    Sep 25, 2006
    9
    0
    hi...

    I use LM301 as instrumentation amplifier. I tried use +/- 9V. It is not working fine, sometimes no respon output when I change the input voltage.
    If I used +/- 15V supply voltage, it's working fine. I use MAX1044 to make it portable, only use a 9V battery. The schematics is on attachment.
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Would you be able to use two 9v batteries with an ICL7662?
     
  6. ne89

    Thread Starter New Member

    Sep 25, 2006
    9
    0
    hi...thingmaker3

    I used MAX1044 because it's very difficult to find ICL7662 in my country.
     
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