opamp circuit

They are all good for something. Consuming power, occupying space, passing signals, blocking signals, warping signals. At the very least, they are good for demonstrating uselessness. What, specifically, would constitute "good" in your mind?

Care to wall that universe in a bit with some specifications?

Okay. Here is one I use quite often:

we are going to use a lm301...has a gain of 5 , has to be able to amplify an ac signal

No, the opamp has a gain of 160000. With external resistors you can reduce it to the desired value. But be aware, that this part requires a high supply voltage. The part can latch up with an input voltage of less than +3V above the negative rail, but it has the capability to go straight to the positive rail, which might be useful in high-side current sensing. Better to use a more modern part tho, with RR/in capabilities you are not stuck to a single application, but have a more universal usage.