operational amplifier

“The U.S. Navy will attain IOC [initial operational capability] in 2018 with 3F software,” DellaVedova wrote.
Pentagon Misfires in Stealth Jet Scandal|Dave Majumdar|January 8, 2015|DAILY BEAST
There was virtually no government oversight of safety and operational standards.
Who Will Get AsiaAir 8501’s Black Boxes?|Clive Irving|December 30, 2014|DAILY BEAST
He mounted a Trace Elliot amplifier on the back of the truck.
Greil Marcus Talks About Trying to Unlock Rock and Roll in 10 Songs|Allen Barra|November 17, 2014|DAILY BEAST
Procurement budgets for weapon systems and operational-cost accounts are separated by a near-unbreachable wall.
America’s 60 Year-Old Nuclear Bomber Might Finally Get a New Engine|Bill Sweetman|October 27, 2014|DAILY BEAST

Paul accomplishes this largely by cutting overseas operational costs and war spending from $159 billion to nothing by 2016.
Fact-Checking the Sunday Shows: October 26|PunditFact.com|October 26, 2014|DAILY BEAST
Mr. Norwood brought out from the city a two-step amplifier and a horn and they were attached to the instrument.
The Campfire Girls of Roselawn|Margaret Penrose
They listened in on the radio that evening until late, using the amplifier and horn that Mr. Norwood had bought.
The Campfire Girls of Roselawn|Margaret Penrose
Wires were run from the amplifier through the rear-seat windows, which were opened just enough to take the thin cables.
The Flaming Mountain|Harold Leland Goodwin
Rick and Scotty watched as the engineer got busy, hooking the remote-switch cable into the amplifier.
The Flaming Mountain|Harold Leland Goodwin
The voice, thin, flat and emotionless, came through a small amplifier.
The Status Civilization|Robert Sheckley

British Dictionary definitions for operational amplifier

noun

a high-gain direct-coupled amplifier, the response of which may be controlled by negative-feedback circuits externally connected

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012