Biasing/erasing oscillation circuit for magnetic tape recording

Details Biasing/erasing oscillation circuit for magnetic tape recording Biasing/erasing oscillation circuit for magnetic tape recording

1998-02-17

2000-05-16

Faber, Alan T.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 5024

Patent

active

060645385

ABSTRACT:
A biasing/erasing oscillator includes a series circuit formed by an entire-width erasing head, a linear record erasing head and an inductor. The series circuit is connected in parallel with an oscillating capacitor to form an LC resonant circuit. The LC resonant circuit is connected to a base of a transistor through a direct current blocking capacitor. The transistor has an emitter is connected to a series junction point, for example, between a sound erasing head and the inductor. A collector of the transistor is supplied with a bias voltage, while the transistor base is supplied with a bias current through a bias resistor. The direct current blocking capacitor prevents the bias current from flowing into the LC resonant circuit.

REFERENCES:
patent: 3812529 (1974-05-01), Yoichi
patent: 5386326 (1995-01-01), Harman
patent: 5771128 (1998-06-01), Lee

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