Amazon.com: DC 12V 24V 4A PWM PC Case CPU Fan Thermostat Speed Controller with Sensor Universal for 2 3 4 Wire Fan (DC 12V /24V 4A Version): Industrial & Scientific
PWM 3A DC Motor Speed Controller Module, Current: 24 V DC, | ID: 21099998688
μC2SE - electronic control - User manual | Heat Pump | Mechanical Fan
Noctua NF-A4x10 5V PWM, Premium Quiet Fan with USB Power Adaptor Cable, 4-Pin, 5V Version (40x10mm, Brown): Amazon.co.uk: Computers & Accessories
MP9151 | 20V, 4A Synchronous, Step-Down Converter with PG and SS | MPS