Electronic dipole for looping a telephone line

Details Electronic dipole for looping a telephone line Electronic dipole for looping a telephone line

1976-05-03

1977-07-19

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307297, 179 16AA, H03K 1700

Patent

active

040371204

ABSTRACT:
An electronic dipole circuit operating at constant current, designed to be used for looping a telephone line from a private branch exchange is disclosed. The circuit comprises a first transistor with the current which is constant in the emitter circuit owing to the presence of a second transistor. A device connected between the collector and the base of the first transistor delivers a constant current. Such a device may comprise, for example, a phototransistor or a field-effect transistor placed in series with a phototransistor.

REFERENCES:
patent: 3576452 (1971-04-01), Smith
patent: 3942046 (1976-03-01), Limberg

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