I am building a low voltage audio amplifier using LM386 op-amp. I got the datasheet from the manufacturer's website and looked at the pins and their functions. After, I designed my own simple circuit regardless of noise values. However, applying that circuit (see circuit labeled 4 in the attached picture) on a breadboard does not give any results. It gives the same input with an expected noise.
The given circuit in the datasheet works just fine, but why does that circuit work? Theoretically the circuit should look like mine with a positive gain. What is the problem with my circuit?