Abstract: An electric frothing device includes a driving unit, a connecting rod, and a frothing unit. The driving unit has a housing, and a drive motor disposed in the housing. The drive motor has a power outputting shaft. The connecting rod is fixed to the power outputting shaft of the drive motor. The frothing unit has a fan fixed to the connecting rod and having blades, and a coil spring disposed with an interval from the blades of the fan.

Abstract: The present invention provides an audio signal to infrared conversion device, comprising: a voltage-multiplying circuit rectifier/filter module, a waveform amplifier module, a microprocessor, an IR signal emitter module, and an IR signal receiver module. The voltage-multiplying circuit rectifier/filter module is coupled to a headset plug; the waveform amplifier module is also coupled to the headset plug, wherein the voltage-multiplying circuit rectifier/filter module is coupled to either one of a left channel connection part and a right channel connection part of the headset plug, and the waveform amplifier module is coupled to the other one of them. The microprocessor is coupled to the voltage-multiplying circuit rectifier/filter module and the waveform amplifier module. The IR signal emitter module is coupled to the microprocessor. The IR signal receiver module is coupled to the microprocessor and the IR signal emitter module.