Frequency-selective sonic remote control switch for electric fan a
Source: InternetPublisher:张七岁 Keywords: Sonic electric fan remote control switch BSP Updated: 2021/10/26
Shown is the electric fan frequency-selective sonic remote control switch circuit. The remote control transmitter consists of NE555 and speakers. The oscillation frequency of NE555
is selected by the RC components of pins ②, @, and ⑦. The oscillation signal is an audio signal, and the sound wave is emitted by the speaker. The receiving circuit is mainly composed of the integrated circuit IC2 (74LS74) and the electric fan motor control circuit. It is used to receive the acoustic signal
emitted from
the transmitter and control the conduction of the electric fan motor power supply to realize the remote control switch .
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