Custom-designed PWM IC with SCD Supporting fully automatic PWM speed control, the fan uses Noctua's custom-designed NE-FD1 PWM IC that integrates Smooth Commutation Drive (SCD) technology.It is designed for noise-sensitive or power-sensitive applications that require active system cooling. The AMC6821 is an intelligent temperature monitor and pulse-width modulation (PWM) fan controller.Third circuit here, but better to replace the 1N4004 with a schottky diode (e.g. You must PWM the fan high-side (in the + line) with a p-channel fet or PNP transistor. You can't use an n-channel fet in the ground line, because ground of the fan is shared with the fan's tach circuit.Components Required 555 Timer IC 12V DC Motor 1N5819 x 2 1N4007 100nF 100pF 10KΩ Resistor Circuit Diagram of PWM Based DC Motor Speed Control. Also Read the Related Post – Stepper Motor Controller using AT89C51 Microcontroller. A more efficient way to proceed is by using Pulse Width Modulation technique to Control the speed of our DC motor.Phanteks Universal Fan Controller, PH-PWHUB_02 - Low Profile Design, Universal Fan Controller, Magnetic Housing, Three Speed Modes with Remote Control. Get fast shipping and top-rated customer service. PWM 600-1500 R.P.M: Air Flow: 43.54 CFM 73.94 m3/h: Air Pressure: 1.17mm H2O: Fan Voltage: 12 VDC: LED Voltage: 5 VDC: Acoustical Noise: 26 dBA: Cable Length: 600mm: LED Lights: 24: LED Power Consumption: 2.4W: Package Content: VORTEX RGB SPB 120 Cooling Fan x 3 Core Box V2 & Power Connector Wireless Controller 4 to 4 Pin Adapter x 3 5V.

Pwm led driver circuit