Degaussing apparatus

Details Degaussing apparatus Degaussing apparatus

1992-04-23

1994-02-15

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

315 8, H01F 1300

Patent

active

052872424

ABSTRACT:
A predetermined rush current is set by a current setting switch (25). A digital-to-analog (D/A) converter (27) multiplies an attenuation curve signal input thereto from a read-only memory (ROM) (28) and the rush current thus set by the current setting switch (25) with each other and outputs a multiplied output to a D/A converter (29). The D/A converter (29) multiplies a signal input thereto from the D/A converter (27) and a sine wave signal read out from a ROM (30) and output a multiplied output to a field effect transistor (FET) (22) through an operational amplifier (24) to thereby control a degaussing current flowing through a degaussing coil (5). Therefore, a stable degaussing effect can be reproduced.

REFERENCES:
patent: 4380716 (1983-04-01), Romeo et al.
patent: 4607310 (1986-08-01), Channel et al.
patent: 4636911 (1987-01-01), Truskalo
patent: 4829214 (1989-05-01), Lendaro

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