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  2. Sound-powered telephone - Wikipedia

    en.wikipedia.org/wiki/Sound-powered_telephone

    A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...

  3. Trimline telephone - Wikipedia

    en.wikipedia.org/wiki/Trimline_telephone

    A 220 Trimline rotary desk phone, showing the innovative rotary dial with moving fingerstop Early Touch Tone Trimline with round buttons and clear plastic backplate and round non-modular handset cord Redesigned touch-tone desk model Trimline, manufactured on January 9, 1985 The Trimline 2225, one of the last phones made at the Indianapolis Works in 1986 Early foreign made Trimline, December ...

  4. Advanced Mobile Phone System - Wikipedia

    en.wikipedia.org/wiki/Advanced_Mobile_Phone_System

    A radio receiver, such as the Icom PCR-1000, that could tune into the Reverse Channel (the frequency on which AMPS phones transmit data to the tower) A PC with a sound card and a software program called Banpaia; A phone that could easily be used for cloning, such as the Oki 900

  5. Automatic gain control - Wikipedia

    en.wikipedia.org/wiki/Automatic_gain_control

    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.

  6. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    An AV or Stereo receiver (in context often just called a receiver) is a component in a hi-fi or home theatre system combining a radio and audio amplifier in one unit that connects to the speakers and often to other input and output components (e.g. turntable, television, tape deck, and CD and DVD players)

  7. Western Electric hand telephone sets - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_hand...

    The B-type desk set was followed by a wall-mounted hand telephone set, designated as the type C handset mounting, also referred to as a hangup telephone, with the handset hanging on one side of the unit in a switchhook fork that cradled only the receiver cup. In use, the B-type telephone base proved unstable during dialing, and was replaced ...

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