Voltage stabiliser suitable for use in a telephone set

Details Voltage stabiliser suitable for use in a telephone set Voltage stabiliser suitable for use in a telephone set

H - Electricity

04

M

379/73

H04M 1/00 (2006.01) H04M 19/08 (2006.01)

Patent

CA 1163390

PHN. 9591 ABSTRACT Voltage stabiliser for use in a telephone instrument, comprising the series arrangement of the main current paths of two transistors and a voltage divider connected in parallel therewith connected between first and second terminals. The bases of the transistors are connected to the voltage divider. The transistors are connected in the Darlington pair configuration. In addition, in order to obtain a high AC impedance, the stabiliser includes a capacitor which is arranged between the bases of transistors and terminal to which the emitter of the second transistor is coupled. To reduce the switch-on time of the stabiliser, a thyristor is provided between the first terminal and the base of the first transistor and a voltage divider whose tap is connected between the first terminal and the junction of the main current paths of the transistors.

361928

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