Magnetic-head short-circuit detector

Details Magnetic-head short-circuit detector Magnetic-head short-circuit detector

1998-10-29

2000-08-15

Ballato, Josie

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324210, G01R 3102

Patent

active

061041998

ABSTRACT:
A magnetic-head short-circuit detector for correctly detecting an electrical short-circuit between coil terminals of a magnetic head. Terminals H.sub.X and H.sub.Y of the magnetic head are connected to the bases of a pnp-transistors P.sub.1 and P.sub.2 respectively. Current sources I.sub.1 and I.sub.2 are inserted between power supply V.sub.CC and the emitters of the transistors P.sub.1 and P.sub.2 respectively. The emitter of the transistor P.sub.1 is connected to the (-) input terminal of a comparator 1 through a resistor R.sub.1 and directly to the (+) input terminal of a comparator 2. The emitter of the transistor P.sub.2 is connected to the (+) input terminal of the comparator 1 through a resistor R.sub.2 and directly to the (-) input terminal of the comparator 2. A current source I.sub.3 is connected between the (-) input terminal of the comparator 1 and GND. A current source I.sub.4 is connected between the (input terminal of the comparator 2 and GND. Based on results of the comparison by the comparator 1 and the comparator 2, a short-circuit on the magnetic head is detected.

REFERENCES:
patent: 4746869 (1988-05-01), Schrag et al.
patent: 5457391 (1995-10-01), Shimizu et al.
patent: 5592097 (1997-01-01), Shimizu et al.

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