Push-pull amplifier and method for operation, particularly recor

Details Push-pull amplifier and method for operation, particularly recor Push-pull amplifier and method for operation, particularly recor

1984-07-18

1987-01-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

G11B 502

Patent

active

046383824

ABSTRACT:
By varying the supply voltage, the output current is adjusted. The push-pull amplifier comprises two branches I, II, each having at least one transistor of the identical conductivity type, the emitters of which are connected with one another and, via a resistor (38, 118), with one pole of the supply voltage source, and the collectors of which are connected with the end terminals (34, 35; 107, 108) of a transformer coil, and one biasing circuit comprising two resistors in a series circuit, the junction points (J1, J2) of which are connected to the bases of the transistors.
The common emitter current is varied virtually exclusively by means of varying the supply voltage, and upon a variation of the supply voltage, the sum of the currents in the two resistor networks are substantially independent of the supply voltage established.

REFERENCES:
patent: 3505662 (1970-04-01), Hibner
patent: 3512171 (1970-05-01), Hibner
patent: 4524396 (1985-06-01), Schulz et al.
patent: 4561027 (1985-12-01), Sita et al.

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