op amp

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

  1. sasek

    Thread Starter Member

    Jan 3, 2010
    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
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    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.