电话尾密码呼入遥控电路的设计

The design of importing telephone tailciphers into a remote-control circuit

本文设计了一种以 DTMF芯片 MT8870为核心的电话尾密码呼入遥控电路 ,该电路能方便使用者在异地通过电话拨号方式遥控继电器动作 。

A remote control circuit,into which telephone tailciphers can be imported,is designed based on DTMF MT8870.Users may easily use the circuit in other place to dial the telephone number to control a relay.This technique is of some value in practice.