Simplest solution for Operational Amplifier Circuit

An operational amplifier is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op amp produces an output potential that is typically 100,000 times larger than the potential difference between its input terminals
There are four basic sections: bias, 2:1, gain and buffer. These four stages can be combined in some op amp devices, but the four functions are fundamental. The bias section provides all of the voltages and currents needed by the other 3 sections.
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