TELEPHONE SET COMBINED INTERPHONE

摘要

In the invention, a button enables a circuit to dial a preset number in memory and drives a tape to transmit a buglar alarm to the police or transfer a gate-interphone communi. to a phone at the place of receiver's presence. High level pulse outputs in order in intervals of a second from a decode bring three optocouplers to make short circuits at resp. output terminals to the effect of pushing RESET, AUTO and #1, buttons on the key pad to dial the preset number in #1, while an automatic switch drives the tape to transmit the memory content to an impedance matching transistor.