Cordless phone anti-theft circuit

Introduction to circuit principles. The original cordless phones all use two regulated power supplies, which are always powered , which consumes power and can be stolen by nearby cordless phones with the same frequency. A power-saving
circuit is used . When no one is talking, the circuit is in the off state, and someone is talking. The signal supplies power to Kl through the IC and Ci rectifiers , causing Kl to pull in. The power saver and the cordless phone are turned on , and IC1 forms a delay working circuit . , VT conduction, KZ suction table, off-hook call,