Induced AC power sources video amplifier

Television – Image signal processing circuitry specific to television – Amplifiers

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348 6, 348 8, 348 10, 348725, 455 31, H04N 514

Patent

active

060644486

ABSTRACT:
An induced AC power source video amplifier includes a signal amplifying circuit, a transformer, and a plastic material shell. One end of the transformer is connected to a metal AC line input prong, and another end is connected to supply power to a signal amplifying circuit. The signal amplifying circuit and transformer are fixed to the plastic material shell so that the metal prong projects to the outside of the shell. The shell further includes input and output terminals and selective switches, including a gain select switch and an input select switch. A single wire line section of proper length is wound around the AC line input between the input prong and the transformer to form a non-contact coil connected to a wireless input end of the input select switch, thus forming a direct inductive connection between the AC line input and the signal amplifying circuit when the input select switch is switched to disconnect the antenna/cable input from the signal amplifying circuitry, the inductive nature of the power line signal connection serving to remove interference from the received TV signal. The gain select switch permits the amplifier to be connected with a CATV cable, an outdoor antenna, or a radio device, while the loop formed by the inductive power line signal connection provides protection from lightning strikes, and reduces the risk of electric shock.

REFERENCES:
patent: 4959873 (1990-09-01), Flynn et al.
patent: 5151838 (1992-09-01), Dockery
patent: 5243415 (1993-09-01), Vance
patent: 5341179 (1994-08-01), Konishi
patent: 5570003 (1996-10-01), Zimmermann
patent: 5787335 (1998-07-01), Novak
patent: 5844766 (1998-12-01), Miglioli

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