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Transistorized Audio Amplifier

IP.com Disclosure Number: IPCOM000098965D
Original Publication Date: 1960-Jun-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Kantner, EA: AUTHOR

Abstract

This is a transistorized audio amplifier proposed for possible substitution in the IBM Type 611 Electronic Transmitter or the IBM Type 618-0 Electronic Transmitter Signal Amplifier. Briefly, the function of the Type 611 and Type 618-0 is to apply carrier frequency signals to conventional electrical distribution power lines to effect control operations of electronically regulated clock and program systems.

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Transistorized Audio Amplifier

This is a transistorized audio amplifier proposed for possible substitution in the IBM Type 611 Electronic Transmitter or the IBM Type 618-0 Electronic Transmitter Signal Amplifier. Briefly, the function of the Type 611 and Type 618- 0 is to apply carrier frequency signals to conventional electrical distribution power lines to effect control operations of electronically regulated clock and program systems.

With the advent of the recently developed power transistors, it is now possible to directly substitute power transistors for all electronic tubes in the Type 611 and Type 618-0 devices. The circuit shows a signal amplifier using four 2N451 G.E. transistors in push pull arrangement cooperating with a power supply using four silicon diodes. The device is capacitively coupled to the power distribution lines. The sizes for resistors R10 through R13 are omitted since they must be empirically determined in accordance with the operating characteristics of the matching transformer and the transistors employed in the circuitry.

Many advantages accrue to this circuit utilizing transistor and silicon diodes as a substitution for the electronic tubes, such as (1) reduced operating voltages for the amplifier unit, (2) a more favorable load impedance matching characteristic, since a transistor is a relatively low impedance device as compared with vacuum tubes, (3) a greater power output, (4) greater efficiency of operation, (5) a decrease in th...