When a call ends, the caller or the called party hangs up, and the switch sends a busy signal to the other party. After a period of time, the busy signal needs to be cancelled. How can I use a single-
Please help me find out what is wrong with the circuit. The speaker can play sound when it is directly connected to the voice IC, but there is no sound after it is connected to the power amplifier. Th
Corridor light voice control switch Most of the corridors and stairwells in modern buildings are equipped with voice-activated or touch-sensitive time-delay automatic switches. This article introduces