Now the general household power amplifier has this function, that is, there is an integrated circuit in the \"standby\" circuit that has a port, give the port a trigger level, the output of this circuit will change, and the following circuit is combined into a similar \"switch\" circuit, to achieve the conversion between work and standby. First of all, look at the stby above the IC is what signal is needed, high level or low level, high level is generally 5V DC voltage, and low level is generally ground.