Control Kecapatan Fan

The following circuit is a circuit that is used to adjust the fan speed by using the PWM (Pulse Width Modulation). This circuit is very easy to make, and do not use the microcontroller or other digital components, for more details, let's look at his series of pictures below

Skema Rangkain Control Kecapatan Fan-Metode PWM

VR1: 10K Potentiometer Function as the motor speed control.

R9: Resistor as a determinant of minimum speed. Diseri with 10K VR, R1 for 1K will provide the settings range from 0 - 100% better used if the load used is a motor or a lamp. If R1 for 10K, will provide the range 5V - 12V is suitable if the load used is the cooling fan.

Q1: For 600mA maximum load, we recommend using the 2N2222A transistors packed in a metal body (TO-18). To load up to 5A please try using a transistor TIP120, 121 or 122.

D1: Diode is used to prevent back-emf which usually occurs in the load inductor such as Fan or Motor. Back-emf can damage the transistor!

Lay out PCD pic

Finished Rangkaian Control Kecapatan Fan

Description IC The LM124 Low Power Quad Operational Amplifier

The LM124 series consists of four independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage.
Application areas include transducer amplifiers, DC gain blocks and all the conventional op amp circuits which now can be more easily implemented in single power supply systems. For example, the LM124 series can be directly operated off of the standard +5V power supply voltage which is used in digital systems and will easily provide the required interface electronics without requiring the additional ±15V power supplies.