Magnetic head switching circuit for magnetic recording and repro

Details Magnetic head switching circuit for magnetic recording and repro Magnetic head switching circuit for magnetic recording and repro

1985-12-02

1987-10-13

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 62, G11B 502, G11B 1512

Patent

active

047002425

ABSTRACT:
A magnetic head switching circuit for a magnetic recording and reproducing apparatus having a recording and reproducing magnetic head has three switching circuits. The first switching circuit is coupled between ground and one end of a winding of the head and controlled between conducting and non-conducting states in response to a voltage applied to a first control terminal. The second switching circuit has an output end, an input end coupled to a D.C. power source, and a second control terminal supplied with a mode switching signal for assuming a non-conducting state in the recording mode and assuming a conducting state in the reproducing mode to guide a voltage at the input end to the output end in response to the mode switching signal. The third switching circuit has an input end coupled to the output end of the second switching circuit and an output end coupled to the first control terminal. When the second switching circuit is in the conducting state, the third switching circuit guides a voltage at the input end of the third switching circuit to the output end of the third switching circuit so as to apply this voltage to the first control terminal and put the first switching circuit into the conducting state.

REFERENCES:
patent: 3959817 (1976-05-01), Honjo et al.
patent: 4266254 (1981-05-01), Hobrecht et al.
patent: 4580177 (1986-04-01), Ito
JVC Service Manual for Model AH-7200U.
JVC Service Manual for Model GK-CIS.

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