I am working on a schematic that requires the operational amplifier MC34072P but I couldn't find it here in local stores!
So, anyone would suggest any substitute to use? I'd be grateful.
And by the way, what are the basic things should I look at in specs to compare such ICs?
Thanks in advance!
Electronic – Replacement for MC34072P Op Amp
operational-amplifier
Best Answer
Good news: almost any opamp can handle this, so that I wonder how you got at the MC34072P, especially since you can't find it. You don't need a high bandwidth or slew rate, or low noise and distortion.
Your main requirements will be power supply and output drive. The LM358 can source minimum 20 mA, typical 40 mA which is probably enough to drive your LED. This current is specified at +15 V supply however, so if you only would have +5 V you might get less. You can always use the opamp's output to drive a transistor.
Don't use a dual supply, like +/- 15 V. If the output would go -15 V the negative voltage will destroy the LED or transistor.