# Op-Amp

Discussion in 'Electronics Homework Help' started by vick5821, Nov 2, 2012.

1. ### vick5821

700
0
Jan 22, 2012
Dear all,

I want to ask, what is the purpose of those resistor in the inverting and non-inverting op-amp ? What actually op-amp does ? Op-amp = comparator? Any differences ?

Thank you

2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,500
2,840
Jan 21, 2010
The equation for an op-amp is Vo = A(V+ - V-)

You should have fun in class with this equation seeing what happens when A gets very large.

You really should look at those equations and find your own way to determining what those 2 resistors do.

Last edited: Nov 2, 2012
3. ### Harald KappModeratorModerator

11,801
2,749
Nov 17, 2011
An OpAmp is an amplifier which amplifies the voltage difference between the "+" input and the "-" input. The open-loop gain of the OpAmp is very high. so feedback is needed to bring the gain into a usable range.

This is a basic explanation of the operation of OpAmps.

I recommend this free PDF for in-depth studies.

4. ### vick5821

700
0
Jan 22, 2012
The resistor act as the potential divider ?