op amp

Discussion in 'The Projects Forum' started by sasek, May 11, 2010.

  1. sasek

    Thread Starter Member

    Jan 3, 2010
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    0
    hai all,

    currently im using LM324 to make simple amplifier and i have 12V to put at Vcc+. Now i have problem to supply Vcc- because i did not have negative voltage source. Here i need some help how could i supply Vcc- with only 12V source????
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
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  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    The LM324 is supposed to be able to operate off a single power supply 3-32V range. The input common mode includes ground.

    If you actually require a split supply (centre-grounded) you can employ a resistive voltage divider - with equal resistors to create a virtual ground at the centre point. Some capacitive bypassing to both + & - rails might be beneficial.

    You can be a bit more "tricky" and use one of four the on-board amps with the equal R voltage divider as a unity gain (buffer) ground driver.
     
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