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Magnetic Multivibrator Amplifier

IP.com Disclosure Number: IPCOM000098193D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Hakimoglu, A: AUTHOR

Abstract

A magnetic multivibrator amplifier is provided in which a relatively small control voltage controls the reset time of a square hysteresis loop magnetic core and, hence, the spacing of the positive output half cycles.

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Magnetic Multivibrator Amplifier

A magnetic multivibrator amplifier is provided in which a relatively small control voltage controls the reset time of a square hysteresis loop magnetic core and, hence, the spacing of the positive output half cycles.

Input winding N1 is connected by means of transistor TR 1 to a source of direct voltage E1 of a fixed value for effecting positive saturation of the core 1. Reset winding N2 is connected to the source E1 in a direction for driving the core 1 to saturation in the opposite sense for the purpose of resetting flux in the core. Control winding Nc is connected through diode Dc in circuit with the emitter and collector of transistor TR 2 whose base circuit is connected to a source of variable control voltage ec. TR 2 acts as a variable impedance and is used to control the value of the reset voltage. The voltage ec determines the value of the impedance across winding Nc and, therefore, the reset voltage across N2.

An RC circuit (Rc, Cc) is connected in series with winding N2 for determining its operating characteristics. The output winding N3 is connected, through a diode D, to a load circuit resistor RL for developing a positive output voltage for application to the load circuit. The base control winding N4 is connected to the base electrode and the emitter of TR 1 for driving the transistor to saturation through a voltage induced in N4 during saturating of the core 1. An adjustable control circuit Rb is connected to N4 for...