Circuit arrangement for powering an electronic dialling device in telephone subscriber stations

摘要

The circuit arrangement for powering an electronic dialling device in telephone subscriber stations in conjunction with a conventional speech circuit is simplified in that the feed voltage is tapped in parallel with the microphone capsule via a decoupling resistor and, in the dialling condition, a storage capacitor is connected in parallel with the speech circuit which supplies the power for redialling and controls the dial tone muting and the reduction in audibility of the pulse transmission in the telephone receiver.