Electrical circuit for audio services

Details Electrical circuit for audio services Electrical circuit for audio services

1975-04-07

1977-05-10

Moose, Harry

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

307326, H02H 904

Patent

active

040230708

ABSTRACT:
A mains safety isolating device is provided for an audio device e.g. guitar and microphone for preventing fatal electrical shock upon grounding breakdown and in which a transformer has a primary winding grounded at a point and connected to an electro-acoustic transducer to receive electrical signals therefrom, a secondary winding of said transformer is connected to a primary winding of a second transformer by signal conductors, a secondary winding of said second transformer being connected to the amplifier circuit of a mains powered amplifying and loudspeaker apparatus, said secondary winding being grounded at a second point separate and isolated from the first-mentioned point.

REFERENCES:
patent: 3192491 (1965-06-01), Hesselberth et al.
patent: 3402372 (1968-09-01), Wasyluk
patent: 3611053 (1971-10-01), Rowell
patent: 3862411 (1975-01-01), Persson
"Electrical Interference," by Rocco F. Ficchi, Hayden Book Company, Inc., New York, 1964, pp. 98-101.

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