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2. Negative-feedback amplifier - Wikipedia

   en.wikipedia.org/wiki/Negative-feedback_amplifier

   Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...

3. Bridged and paralleled amplifiers - Wikipedia

   en.wikipedia.org/wiki/Bridged_and_paralleled...

   Some two channel amplifiers, or stereo amplifiers, have the built in facility to operate in bridge mode by operating a switch and observing the input and output connections detailed on the back panel or in the manual. This option is most often found in high power PA equipment or amplifiers designed for car audio applications.

4. Acoustic Research - Wikipedia

   en.wikipedia.org/wiki/Acoustic_Research

   Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment. The brand is now owned by VOXX . Acoustic Research was known for the AR-3 series of speaker systems, which used the 12 in (300 mm) acoustic suspension woofer of the AR-1 with newly designed dome mid-range speaker and high-frequency drivers .

5. Amplifier - Wikipedia

   en.wikipedia.org/wiki/Amplifier

   In general, the power amplifier is the last 'amplifier' or actual circuit in a signal chain (the output stage) and is the amplifier stage that requires attention to power efficiency. Efficiency considerations lead to the various classes of power amplifiers based on the biasing of the output transistors or tubes: see power amplifier classes below.

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7. Operational amplifier - Wikipedia

   en.wikipedia.org/wiki/Operational_amplifier

   This op amp was based on a descendant of Loebe Julie's 1947 design and, along with its successors, would start the widespread use of op amps in industry. GAP/R model P45: a solid-state, discrete op amp (1961). 1961: A discrete IC op amp. With the birth of the transistor in 1947, and the silicon transistor in 1954, the concept of ICs became a ...