Jisho

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Noun
1. op-amp; operational amplifier
Wikipedia definition
2. Operational amplifierAn operational amplifier ("op-amp") is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. An op-amp produces an output voltage that is typically hundreds of thousands times larger than the voltage difference between its input terminals. Operational amplifiers had their origins in analog computers where they were used in many linear, non-linear and frequency-dependent circuits.
Read “Operational amplifier” on English Wikipedia
Read “オペアンプ” on Japanese Wikipedia
Read “Operational amplifier” on DBpedia

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