Make a timer circuit using a time clock

Working principle of the circuit: When the time clock reaches the set time,
an AC audio voltage of about 2V is generated at both ends of the speaker. After rectification by the diode and filtering by the capacitor, a DC voltage of about 1V is obtained between the base and emitter of
the transistor VT. , VT is saturated and
turned on, the relay is closed, and the leakage circuit breaker is triggered, thus cutting off the power supply of household appliances
.