Go Down

Topic: LM339 (Op amp chip) with arduino.. safe currents? (Read 977 times) previous topic - next topic

mahela007

Can this circuit be powered by the +5V supply from an arduino?
http://reipooom.files.wordpress.com/2011/07/lm339.png

I know Op-amps have high input impedance at the inverting and non-inverting terminals. But what about the + and - voltage terminals? Will they draw too much current?

mahela007

Ok.. I found the answer myself.
You just have to read the 'source current' spec in the op-amp datasheet.

terryking228

Hi, right answer..

But for information: LM339 is a Comparator:

Compares two analog voltage values and gives a digital output HIGH or LOW, 1 or 0

LM339 has 4 comparators in one package.

Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

Go Up