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Fan speed controllers
DC-51 AC 220V to DC 90V 24V 180V Electrical Speed Control Controller for 60W 200W Motor Discount _ - AliExpress Mobile
DC-51 DC Motor Speed Controller Regulator, 220 V AC
DC12V-60V/20A Motor Speed Controller, DC Motor Speed Controller, Forward/Reverse Electric Motor Speed Regulator, Suitable for DC Brush Motor.: Amazon.com: Tools & Home Improvement
WC 15 Speed control - Fantech
US Series (Features) :: Speed Control Motors :: Product Information :: Oriental Motor Co., Ltd.
Arduino-Based Universal AC Motor Speed Controller - Hackster.io
180v Dc High Quality Speed Controller Dc Permanent Magnet Motor Control 500w Speed Controller/speed Governor - Motor Controller - AliExpress
Single Phase varaible frequency drive with Electric motor speed control package