Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware

motor control

MAX6650 Fan Speed Controller

We can simplified greatly the fan speed regulation design using a dedicated IC such as the MAX6650 or MAX6651. The MAX6650 is designed to control a single fan. The MAX6651 has more features, it can controls a single fan and can monitor and watchdog three additional fan tachometer outputs. We can synchronize multiple MAX6651s to […]

Fan Speed Controller Using Op-Amp

We can make an enhancement to DAC drive fan controllers with the use of an external amplifier that closes the loop around the tachometer. Essentially linear control over the full range of 8 bit DAC codes from 0 to 255 is provided by this enhancement. This only requires a little signal conditioning and a suitable […]

PWM Speed Control with Forward-Reverse and Regenerative Braking

Figure below shows us a PWM Speed DC Motor Rotation circuit. This circuit has two functions, Forward-Reverse and Regenerative Braking function. On this circuit, we can control the speed of DC 12V motor with Power Mosfet IRF150 using a signal PWM. The Relay RY1 work as control Reverse with the digital alarm, change Q10. The […]


Automatic Cooling Fan Controller

This is an Automatic Cooling Fan Controller circuit. This circuit is very useful during summer to keep our important item and rigs such as VHF and UHF transceivers staying cool. Because VHF and UHF transceivers were sold with no cooling fans and oversized heat sinks. Here is the circuit: This circuit uses The thermistor, R1. […]


Motor-Speed Control Employs Class-D Power Amplifier

A dual benefit for battery-powered portable devices is provided by Class D audio amplifier. The produce much less power dissipation than do their linear cousins and they enhance battery life. Those features make this device an ideal candidate for controlling speed and direction in small electric motors. The standard application circuit for a class D […]

High Efficency Solar Powered Motor Driver

This motor driver deliver the power form capacitor to the motor when the capacitor is charged to 1.75V by the solar cell. After powering the motor, capacitor voltage will be discharged and the circuit will cut the capacitor-motor connection when the voltage drops below 1V, allowing the capacitor to be charged to 1.75V again to […]


Overvoltage Protected Compressor Control

We can control medium power load, such as AC motors in home appliances, using ACST12 devices. Because of it’s thermal and turn off commutation performances, this device is able to drive an inductive load up to 12 A with no turn if additional snubber. High thermal performances in static and transient modes such as the […]


DC Motor Control System Block Diagram

A schematic arrangement for a two quadrant controller is shown on figure below. This figure show us the outer speed control loop and the inner current control loop. The tachogenerator derive the speed feedback signal, although alternatively an approximation to the motor speed can be derived by feeding back a signal proportional to the motor […]

Single Phase Induction Motor Control Theory

The most used is single-phase induction motors. This motors operate with a single phase power supply, only have one stator winding and are also squirrel cage. The motor is not self-started when connected to power supply because of the single phase. The motor only vibrate and not rotate because the necessary torque is not generated. […]

Enabling 3 Phase Motor to Operates with Single Phase Supply

Capacitor have been use for decades to operate 3-phase motors on single-phase power. Two single-phase wires are connected to two of the inputs on a 3 phase motor on this method. Then, the capacitors is connected to one of the single -phase inputs and the third leg of the motor. Here is the schematic diagram […]


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