| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone system with power-saving functions where no useless power is wasted in a standby state. SOLUTION: The interphone system is provided with an operating state output terminal 1 that is a secondary winding output terminal of a power transformer C and outputs an operating power matching the required maximum consumed power to a power supply circuit F and with a standby state output terminal 2 that outputs a standby power matching the a maximum consumed power to the power supply circuit F. In the case of an operating state, a transformer output terminal changeover means N supplies power from the operating state output terminal 1 to the power supply circuit F and supplies power to the power supply circuit F from the standby state output terminal 2 in the standby state. |
