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Additionally, in ruins of Tiwanaku are stones around the central place with holes shaped in a megaphone's profile. Their purpose is today unknown, but as local guards can show, it is possible to amplify a human voice loud enough to hear it across a large area. A late 19th-century speaking trumpet used by firefighters
Schematic of an AGC used in the analog telephone network; the feedback from output level to gain is effected via a Vactrol resistive opto-isolator.. Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input.
A cellular repeater (also known as cell phone signal booster or cell phone signal amplifier) is a type of bi-directional amplifier used to improve cell phone reception. [citation needed] A cellular repeater system commonly consists of a donor antenna that receives and transmits signal from nearby cell towers, coaxial cables, a signal amplifier, and an indoor rebroadcast antenna.
Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus One hi-fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
As rotary phone collector Andrew Nodell from Brooklyn tells House Beautiful, “I’ve always been fascinated by the conversations that may have happened through them—news of weddings, war, love ...
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Alex Germano, P.T., D.P.T., G.C.S., CF-L2, a physical therapist, fitness coach, and clinician with FOX Rehabilitation said she sees the niche appealing to women more than ever before “with an ...
The modulation signal output by the demodulator is usually amplified to increase its strength, then the information is converted back to a human-usable form by some type of transducer. An audio signal , representing sound, as in a broadcast radio, is converted to sound waves by an earphone or loudspeaker .