Wireless remote control fan speed controller

Relevant key device information applied in this article: TWH9238 9013 The speed adjustment of desktop fans is usually achieved by using a piano-type interlock switch to control the connection or disconnection of the inductor tap. If the remote control circuit is used to control the relay and change the access or change of the inductor tap, it can achieve the same function as the key switch and realize remote control speed regulation. The remote control transmitting circuit of the wireless remote control fan speed controller uses the finished circuit component TWH9236, which is not shown in the figure. The remote control receiving circuit uses TWH9238, in which the data output terminal A is idle. The output terminal Io drives the piezoelectric buzzer HTD through the amplifier VT1, which is used to make a sound to indicate the successful shifting operation. Output terminals B, C, and D drive relays K3, K2, and K1 through drive tubes VT4, VT3, and VT2 respectively, which are used to connect or disconnect the taps K1, K2, and K3 of the speed regulating inductor to realize gear shifting and speed regulation.