Automatic telephone code/number dialling mechanism having keyboard pre selector and handset lifting activating telephone dialling sound pulses following keyboard selected number.

摘要

The automatic telephone composition dialler has a voltage battery feed and a keyboard pre selector validating a channel selection network and generating pulses when a line setting (T0) is detected on lifting the handset. The pulses cross optic couplers providing dc isolation and act on a telephone dialling network sending out speech salvo signals following the keyboard selected (BP1 to BP4) number.