Amazon.com: Ultra Slim Case Fan 120mm Case Fan with Long Life Sleeve Bearing, Super Quiet Computer Case Fan with PWM (Pulse Width Modulation) Supported, 15 mm Thickness Very Thin & Low Profile :
Amazon.com: StarTech.com 80x25mm Computer Case Fan with PWM - Pulse Width Modulation Connector - computer cooling Fan - 80mm Fan - pwm Fan (FAN8025PWM) Black : Electronics
Pulse-Width Modulated DC-DC Power Converters: Kazimierczuk, Marian K.: 9781119009542: Amazon.com: Books
Pulse Width Modulation in Power Electronics: Mayergoyz, Isaak D, Tyagi, Siddharth + Free Shipping
Banner LC65P1T LED Dimmer Module Pulse Width Modulation 12-30VDC 4A Terminals 88188: Amazon.com: Tools & Home Improvement