op amp

Thread Starter

sasek

Joined Jan 3, 2010
64
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????
 

t_n_k

Joined Mar 6, 2009
5,447
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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