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DC motor driver with H-Bridge IC L293D IC H Bridge DC motor driver L298 has two H-Bridge circuit in it, so it can be used to download the drive two DC motors. H Bridge DC motor driver L298 each can deliver currents up to 2A. However, in use, the H Bridge DC motor driver L298 can be used in parallel, so the ability to deliver the H Bridge DC motor driver L298 flow into 4A. The consequences of the installation of H Bridge L298 DC motor driver with the parallel mode, you need 2 pieces Bridge H L298 DC motor driver to control two DC motors using H bridge DC motor driver L298 in parallel mode. H Bridge Pin IC L298 DC motor driver which is connected in parallel operation mode: * OUT1 connected to OUT4. * OUT2 OUT3 linked. * IN1 is connected to IN4. * IN2 connected to IN3. * ENABLE ENABLE A linked to B. OUT1/OUT4 and OUT2/OUT3 associated with DC motors to be controlled. Please note that the output of the L298 does not have a safety diode. Thus, the need to add two diodes - flyback diodes, wit...

This is a simple ceiling fan regulator circuit diagram. It is used to control the speed of a ceiling fan. In the other words it is an AC motor speed controller circuit, as because it's control the speed of a AC motor(Ceiling Fan).  This ceiling fan regulator circuit built with few numbers of parts. The circuit mainly  based on Z0607 TRIAC. This is a low power AC semiconductor device. Generally which is used to controlling speed of low power ac motor speed.  Circuit Diagram of Ceiling Fan Regulator :      In this ceiling fan regulator circuit , R1=500KΩ is a variable resistor that is used to adjust the fan speed. Capacitor C1 2A104J is a Polyester film capacitor. Pin Diagram of  TRIAC(T1)- Z0607:  Fig: Z0607-TRIAC Pin diagram Pin Diagram of Variable Resistor R1: Fig: Pin Diagram of Variable Resistor Parts List Ceiling Fan Motor Speed Controller circuit: T1 = Z0607 -TRIAC D1 = DB3 C312 -DIAC R1 = 500KΩ -Variable Resistor R2 = 37KΩ -Resistor C1 = 2...

This is yet another project born of necessity. It's a simple circuit, but does exactly what it's designed to do - dim LED lights or control the speed of 12V DC motors. The circuit uses PWM to regulate the effective or average current through the LED array, 12V incandescent lamp (such as a car headlight bulb) or DC motor. The only difference between the two modes of operation is the addition of a power diode for motor speed control, although a small diode should be used for dimmers too, in case long leads are used which will create an inductive back EMF when the MOSFET switches off. The photo shows what a completed board looks like. Dimensions are 53 x 37mm, so it's possible to install it into quite small spaces. The parts used are readily available, and many subsitiutions are available for both the MOSFET and power diode (the latter is only needed for motor speed control). The opamps should not be substituted, because the ones used were chosen for low power and their abilit...

Small DC motors are efficiently controlled using pulse-width modulation (PWM) method. The circuit described here is built around an LM324 low-power quad-operational amplifier. Of the four op-amps (operational amplifiers) available in this IC, two are used for triangular wave generator and one for comparator. Op-amp N2 generates a 1.6kHz square wave, while op-amp N1 is configured as an integrator. The square wave output of N2 at its pin 14 is fed to the inverting input (pin 2) of N1 through resistor R1. As N1 is configured as an integrator, it outputs a triangular wave of the same frequency as the square wave. The triangular wave is fed to pin 5 of op-amp N3, which is configured as a comparator. Small DC Motor Control Circuit Diagram : The reference voltage at pin 6 of the comparator is fixed through the potential divider arrangement formed by potmeter VR1 and resistors R4 and R5. It can be set from –6V (lowermost position of VR1) to +6V (uppermost position of VR1). The triangular w...

Stepper Motor Connections: Unipolar motor should have five or six connections depending on the model. If the motor has six connections like the one pictured above, you have to join pins 1 and 2 (red) together and connect them to a (+) 12-24V voltage supply. The remaining pins; a1 (yellow), b1 (black), a2 (orange), b2 (brown) should be connected to a driver (ULN2003 etc). Stepper Motor Connections Stepping Modes: There are several stepping modes that you can use to drive the stepper motor. Single Stepping  - the simplest mode turns one coil ON at a time. 48 pulses are needed to complete one revolution. Each pulse moves rotor by 7.5 degrees.  The following sequence has to be repeated 12 times for motor to complete one revolution. Pulse Coil a1 Coil b1 Coil a2 Coil b2 1 ON 2 ON 3 ON 4 ON High Torque Stepping  - high power / precision mode turns ON two coils on at a time. 48 pulses are needed to complete one revolution. Each pulse moves rotor by 7.5 degrees.  The follow...

Speed ​​Control of DC Motor PWM Circuit Diagram. Often, people try to control small DC motors with a variable resistor type potentiometer connected to a transistor. This system until works well but it generates heat and thus loses power. This circuit is a simple circuit for modulating the pulse width for controlling the DC motor, it eliminates this problem.  Speed ​​Control of DC Motor PWM Circuit Diagram The circuit is capable of controlling the engine speed pulses (PWM), these pulses have a duration variable to change the speed of the motor. The longer the pulses lead, the faster the motor will rotate, and vice versa. R1 1 Meg 1/4W Resistor R2 Potentiometer 100K C1 0.1uF 25V Capacitor Ceramic Disc C2 0.01uF 25V Capacitor Ceramic Disc Q1 MOSFET IRF511 or IRF620 U1 4011 CMOS NAND S1 KEY M1 Motor  The resistor R2 adjusts the speed of the oscillator and thus the speed of the motor, the motor can be any DC motor that operates from 6V and having no more powe...

zBot :10-A Power Stage for DC Motor Circuit Diagram . If you look at the chassis of the zBot vehicle1, you’ll find two parts requiring intelligent control: the steering servo and the DC motor . The so called H-bridge is the normal circuit for electronic control of revolution speed and direction. The DC motor of a Tamiya car is powerful enough to propel zBot at up to 20 miles per hour. . The motor then consumes more than 10 A, so we choose high-current power MOSFETs for the driver stage. There are lots of different devices to choose from. The MOSFET we require has to supply the maximum motor current and, importantly, it has to be switched with gate voltages of about 5 V. In this case, the microcontroller switches the power stage (‘low side’) directly. For high side driving level shifters are necessary. The schematic of the H-bridge power stage shows a few inverters, NAND gates and two tri-stateable drivers. These logic functions are very important as the easier way, i.e.., directly con...

The interlock contacts installed in the previous section’s motor control circuit work fine, but the motor will run only as long as each pushbutton switch is held down. If we wanted to keep the motor running even after the operator takes his or her hand off the control switch(es), we could change the circuit in a couple of different ways: we could replace the pushbutton switches with toggle switches, or we could add some more relay logic to “latch” the control circuit with a single, momentary actuation of either switch. Let’s see how the second approach is implemented, since it is commonly used in industry: When the “Forward” pushbutton is actuated, M 1 will energize, closing the normally-open auxiliary contact in parallel with that switch. When the pushbutton is released, the closed M 1 auxiliary contact will maintain current to the coil of M 1 , thus latching the “Forward” circuit in the “on” state. The same sort of thing will happen when the “Reverse” pushbutton is pressed. The...

The article discusses a simple IR remote control circuit which is configured for operating a DC motor in response to the switching made from a standard IR remote handset such as a TV remote or a DVD remote. The connected motor can be moved either ways and also can be made to halt. The circuit may be understood with the following explanations: As can be seen in the given circuit diagram, the sensor is any standard three pin IR sensor module which would typically respond to any TV IR remote handset. When an IR (infra red) beam is focused at the sensor, the pin which is designated as the output becomes logic low. This situation persists as long as the beam remains focused at it. The transistor T1 which is a PNP responds to this logic low signal and conducts switching the attached relay RL1. The contacts instantly connect the instantaneous positive potential at the collector of the transistor to pin#14 of the IC1 which is wired as a flip flop circuit. Assuming the initial ...