SU1310892A1 - Erasing-bias current generator - Google Patents

Abstract

This invention relates to magnetic recording. The aim of the invention is to simplify the design of the erase-magnetic bias current generator. When the supply voltage is supplied across the supply bus 2 to the bipolar transistor 1 in an oscillating circuit consisting of an inductance coil 9, an erasable magnetic head 10 and a capacitor 7, due to the positive feedback formed by the capacitors 5 and 7, an electrical oscillation occurs. A current flows through the capacitor 7, which forms the erase current passing through the erasing magnetic head 10 and the bias current that passes through the trimming resistor 8, the capacitor 6 and the universal magnetic head 12. The magnitude of the bias current is adjusted by means of the trimming resistor 8. In this case, the capacitor 4 and a constant resistor 3 provides for obtaining a predetermined shape of the erase current-magnetization. I il. SS (L with about 00 x to

Description

: The invention relates to magnetic recording, in particular to erase current-magnetism current generators.

The aim of the invention is to simplify the design of the erase-sub-magnetization current generator.

The drawing shows a variant of the proposed erasing current generator -poldering.

The generator contains a bipolar transistor 1 connected by an emitter to the power supply bus 2 and connected directly to the first terminals of the constant resistor 3, 3, the first capacitor 4 and the second capacitor 5, the third and fourth capacitors 6 and 7, the trimming resistor 8 and coil 9 inductance. The second output of the second capacitor 5 is connected directly to the first output of the erasing magnetic head 10 and to the first output of the trimming resistor 8, the second output of which is connected via the third capacitor 6 to the first output of the universal magnetic head 12. The second output of the universal magnetic head 12 - 11, connected directly to the second output of the erasing magnetic head 10 and to the first output of the inductor 9, connected by the second output to the first output of the fourth capacitor 7.

In the generator, the collector of the bipolar transistor 1 is connected directly to the second output of the inductance coil 9 and to the first output of the fourth capacitor 7 connected by a second output directly to the first output of the erasing magnetic head 10. At the same time, the community 11 is connected directly to the second outputs of the first capacitor 4 and permanently This resistor 3.

In the generator, the inductor 9, the erasing magnetic head 10 and the fourth capacitor 7 form an oscillating circuit. The second and fourth capacitors 5 and 7 form a positive feedback between the collector and the base of the bipolar transistor 1.

The proposed erase current generator - bias works as follows.

Compiled by Y.-K. V. Rosencrantz

Tehred I. VeresKorrektor I. Erdeyi

Circulation 590 Subscription

VNIIPI USSR State Committee for Inventions and Discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4

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When power is applied to the busbar 2, the power is supplied to a bipolar transistor 1 in an oscillating circuit consisting of an inductance coil 9, an erasing magnetic head 10 and a fourth capacitor 7, due to the positive feedback formed by the second and fourth capacitors 5 and 7, electric oscillation occurs. In this case, a current flows through the fourth capacitor 7, which forms the erasing current passing through the erasing magnetic head 10 and the bias current. The bias current passes through the trimming resistor 8, the third capacitor 6 and the universal magnetic head 12. The current magnitude Pod1 1 is regulated by means of the trim resistor 8. In this case, the first capacitor 4 and the fixed resistor 3 provide the specified current-erase-magnetic circuit.

Claims (1)

Claims An erase current generator-magnetisation comprising a bipolar transistor connected by an emitter to a power bus and connected by a base directly to the first terminals of a constant resistor, the first capacitor and a second capacitor connected by a second output directly to the first terminals of the erasable magnetic head and trimmer resistor, the second output of which through the third capacitor is connected to the first output of the universal magnetic head connected by the second output to the common busbar, which connected directly to the second output of the erasing magnetic head and to the first output of the inductance coil connected by the second output to the first output of the fourth capacitor, characterized in that, in order to simplify the design of the erase current generator - magnetization, the collector of the bipolar transistor is connected directly to the second output of the inductor and to the first terminal of the fourth capacitor, connected by the second terminal directly to the first terminal of the erasing magnetic head, and the common bus under lyuchena directly to the second terminal of the first capacitor and the DC resistor.