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operating microscope
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operational amplifier
op·er·a·tion·al am·pli·fi·er (plural op·er·a·tion·al am·pli·fi·ers)


noun 
Definition:
 
high-gain amplifier: an amplifier with high gain and high stability that is controlled by way of externally connected negative-feedback circuits
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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