Definition
A high-gain electronic amplifier circuit, typically built into an integrated circuit, that takes the difference between two input voltages and produces an output voltage that is a large, predictable multiple of that difference. By adding external resistors and capacitors around it, an op-amp can be configured to perform a wide range of functions such as amplifying weak signals, comparing two voltages, summing signals, or filtering unwanted frequencies.
Plain English
A small, very sensitive amplifier chip used as a building block in aircraft electronics. It takes a tiny electrical signal and makes it much larger, or compares two signals and reports the difference, depending on how it is wired up around the chip.
Context Anchor
Seen in aircraft electrical, instrument, and avionics maintenance discussions, especially when describing how sensors and circuits process signals.
Derivation
The name comes from its original purpose in early analog computers, where it was used to perform mathematical operations such as addition, subtraction, and integration on electrical signals. 'Operational' refers to those mathematical operations, not to flight operations.
Why Pilots Care
It provides accurate amplification of tiny sensor signals inside instruments and autopilots, supporting reliable flight data and control responses.
Analogy
An operational amplifier is like a very sensitive helper listening to two weak messages, noticing the difference between them, and sending out a clearer, stronger message that another device can act on.
Intuition Check
Do not read “operational” as “working” or “ready for use” here. In this term, “operational” means the amplifier is used to perform operations on electrical signals.
Example Sentence 1
The attitude indicator's signal conditioning board uses an operational amplifier to boost the weak sensor output before sending it to the display.
Example Sentence 2
Inside the autopilot computer, operational amplifiers process control inputs to produce smooth corrections to the flight path.