CONNECTION CIRCUIT FOR TERMINAL EQUIPMENT

PURPOSE:To prevent a malfunction with simple constitution by inserting each rectifier circuit connected to a contact driving section at every communication channel corresponding to each terminal equipment respectively and inserting the contact part switched with the contact driving section to other communication channel. CONSTITUTION:In the case of dialing from a terminal equipment 10, a handset is hooked off, a coin is deposited to a coin inserting port, a dial of the terminal equipment 10 is turned, and when communication is started, the polarity inversion of the line is repeated every time during communication to collect the talking charge from the terminal equipment 10 being a telephone set, the supply direction of power supply (driving current) to a contact driving section 14 is unidirectional and a relevant contact 13 keeps the open state stable. Thus, even when a handset of other terminal equipment 20 is hooked off for communication while the terminal equipment 10 is busy, since the contact 13 of a relay 12 is opened, the line is not selected to the other terminal equipment 20 and stable communication without noise interference or the like is attained.