|
DC Motor Control - This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's. __ Designed by Andy Collison DC Motor Control using a Single Switch - This simple circuit lets you run a DC motor in clockwise or anti-clockwise direction and stop it using a single switch. It provides a constant voltage for proper operation of the...__ Electronics Projects for You
DC Motor Control using PWM - 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. STUTEE SAXENA
DC Motor Driver with L6203 - The L6203 is a DMOS full bridge driver, which can handle the high peak current up to 5A and supply voltage up to 48V with RDS (ON) of just 0.3 ohm. The chip can run the DC motor at 4A continuous with proper heat sinking. The above DC motor driver circuit is implemented with L6203 chip accompanied by a L6205 current controller. The current controller is used in this circuit as a pair of latching comparators. When the current through the motor reaches __ Designed by www.wzmicro.com
DC Motor Model - Although SPICE does not provide explicit models for electro-mechanical devices, like a DC motor, creating one is fairly straightforward. You just need to remember that most physical behaviors, whether mechanical or electrical, can be described by a set of equations. So for a desired (spice design)
DC Motor Pulse Width Modulation Speed Control - This is a circuit for controlling the speed of small DC motors, it works nicely as a speed controller for an HO or N gauge model railroad. __ Designed by G. Forrest Cook
DC Motor Reversing - A DC motor reversing circuit using non latching push button switches. Relays control forward, stop and reverse action, and the motor cannot be switched from forward to reverse unless the stop switch is pressed first __ Designed by Andy Collison
DC Motor-Driver H-Bridge - Physical motion of some form helps differentiate a robot from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass enough current or voltage to spin a motor. Also, motors tend to be electrically noisy (spikes) and can slam power back __ Contact: David Cook
DC Motor-Driver H-Bridgedb - Physical motion of some form helps differentiate at from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass
DC Power Supply - Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC. The supply is suitable for microcontroller experimenting. __ Designed by Wichit Sirichote
DC Push Button Motor Control - This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's. __ Designed by Andy Collison
DC Relay Switch for High-Current Loads - Want to switch power to a high-current load using a circuit capable of supplying just a few milliamps? No problem - build and use the SILICON CHIP DC Relay Switch.__ SiliconChip
DC servo Motor driver - site is currently under construction __ Contact: IQ Technologies
DC Servomotor Controller - An experiment on the DC servomotor control system. It is controlled with only an AVR. __ Designed by The Electronic Lives Manufacturing-presented Chan
DC to AC inverter using a 555 timer - This DC-to-AC inverter schematic produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4. The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament__ Tony van Roon VA3AVR
DC-motor switch with brake - 10-Jan-02 EDN-Design Ideas - Controlling a small dc motor without speed control sounds like a trivial task; a switch or a relay should suffice. However, several problems accompany this approach. For one, the switch, because of the inductive load and the low starting resistance of the motor, tends to wear out prematurely (with all the related sparks and EMI problems] Design by JB Guiot, DCS AG, Allschwil, Switzerland
Delayed Start for Appliances - Your washing machine lacks this useful feature? This special timer will power it only when you want to. Say goodbay to creasy clothes because of the time spent waiting in the machine. And if your problem is limited overall electric power, you can set up the washing machine and the dishwater at the same time, having them working at different hours __ Designed by Projects & Ideas from Nutchip.com
Design Notes 504: 42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current - 11/26/13 EDN-Design Notes Measure inductance & capacitance over a wide range. The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications. To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation. The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output. Design by Hua Walker Bai
DI Nocturnal Solar Engine - The D1 solar engine is the original nocturnal solar engine design. The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks' historical interest) . This design has a number of weaknesses; courtesy of Wilf Rigter, here are a few: __ Contact: Eric Seale
Digital Encoder using Stepper Motor - Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display. Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor.
Dimmer/Motor Speed Control - Lamp dimmers using traics can be quite simple, nothing more than a potentiometer, resistor, capacitor and TRIAC with a built-in diac. (See Teccor's App Note for examples and other technical data.) The circuit below is similar __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Discrete component Motor direction controller - This circuit can control a small DC motor, like the one in a tape recorder. When both the points A & B are "HIGH" Q1 and Q2 are in saturation. Hence the bases of Q3 to Q6 are grounded. Hence Q3, Q5 are OFF and Q4, Q6 are ON. The voltages at both the motor terminals is the same and hence the motor is OFF. Similarly when both A and B are "LOW" the motor is OFF. When A is HIGH and B is LOW, Q1 saturates, Q2 is OFF. The bases of Q3 and Q4 are grounded and that of Q4 and Q5 are HIGH. Hence Q4 and Q5 conduct making the right terminal of the motor more positive than the
DIY Power Pulse Controller - This device uses a built in pulse width modulated signal generator circuit for triggering a power MOSFET.__ © RMCybernetics
Dremel drill speed controller - The Dremel drill fitted with a mini drill-chuck on a stand is a great setup for drilling circuit boards. The problem is that it does not do low speeds very well. My unit had a failed internal speed controller, so I just wired around it and connected it to a regulated 24 volt DC supply. This worked OK, but I would like a slower speed when drilling boards. slowing down with a lower voltage, however, causes it to stall out completly when it begins drilling. What I needed was a circuit to actually increase power to the motor under increasing load. __ Designed by Luhan Monat - Mesa Arizona
Driving Bipolar Stepper Motors - Stepper motors are devices, which convert electrical impulses into discrete mechanical rotational movements. In a typical stepper motor, power is applied to two coils. Two stator cups formed around each of these coils, __ Designed by Seiichi Inoue
Driving Bipolar Stepper Motors - The permanent magnet rotor has the same number of pole pairs as the stator coil section. Interaction between the rotor and stator (opposite poles attracting and like poles repelling) causes the rotor to move ¼ of a pole pitch per winding polarity change. Motors are available in either 2 coil (bipolar) or 4 coil (unipolar) windings. In the unipolar.
Driving Stepper Motors - Stepper motor are commonly used for moving robots. If you love experimenting, stepper motors will give hours of great fun. Learn how to generate the basic step sequences (full-step vs. half-step) , and what a full bridge driver is. __ Designed by Projects & Ideas from Nutchip.com
DSPs boost Motor-control quality - 11/21/96 EDN-Design Ideas - everal months after Texas Instruments (Dallas) announced its TMS320C240 DSP for motor control (EDN , Sept 12, 1996, pg 26) , Analog Devices has announced its version of a motor-control DSP, the ADMC330. These new products represent a growing trend toward designers’ using more computational power to help make both ac and dc motors more reliable, more efficient, and lower cost. The motor-control DSPs eliminate position-, speed-, and phase-current sensors. The DSPs also support variable-speed direct drive and, therefore, eliminate gears, belts, and hydraulics. They also support the move to three-phase, brushless motors. Design by Markus Levy, Analog Devices, Norwood, MA
DSSSE - Type 1 (Voltage Controlled) Solar Engine - If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head adaptation. The problem is that HCMOS
gates are power hungry when used as SE voltage comparators when the analog input voltage is near the CMOS
switching threshold. If an HCMOS
gate is used without sampling, the chip supply current can be as high as 70mA with the comparator input voltage near the trigger threshold (Vcc / 2) . __ Designed by Wilf Rigter
Dual +/-25V LAB Supply - Up to 800mA (typical) output current at +/-25V. __ Designed by Rod Elliott ESP
Dual 12V Power Supply - Schematic only __ Designed by Tony van Roon VA3AVR
Dual DC Motor Speed Controllers Navigate Robots - 03/29/01 EDN-Design Ideas - Mobile robots need simple and lightweight dc-motor-speed-control hardware that can work with low-power batteries. Flip-flop type navigation systems allow only one motor to operate at a time while the other motor remains off. Navigation direction changes Design by Shyam Sunder Tiwari, Robotics Software Pvt Ltd, Gwalior, India
Dual Fan Controller - Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79.
Dual Fan Controller - A birthday present gone too far. An overengineered temperature-based automatic twin fan controller with brass face to keep a kitchen PC cool. __ Contact: David Cook
Dual Motor Control for Robots - Presented here is a simple circuit that can drive two motors for a small robot, allowing the robot to negotiate an obstacle course. Two light-dependent resistors (LDRs) are used to detect...__ Electronics Projects for You
Dual Polarity Power Supply - This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage.
__ Designed by Aaron Cake
Dual power supply - The 7915 (at least the "made in Morocco" I used) needs a small load (some mA) to work correctly. If you get funny voltages (-18.4V or so) , put a resistor from the 7915 output to ground (2k2 works good) . Or it might be a good idea to put the "power on" LED with a 1k5 resistor to the negative rail (take care of polarity!) . __ Designed by Albert Kreuzer,
RIP 4/7/2011
Dual Slope-Sampling Solar Engine - If you had time to experiment with the ALF type SE circuit you may have discovered some of its shortcomings with regard to a Power Smart Head adaptation. The problem is that HCMOS
gates are power hungry when used as SE voltage comparators when the analog input voltage is near the CMOS
switching threshold. If an HCMOS
gate is used without sampling, the chip supply current can be as high as 70mA with the comparator input voltage near the trigger threshold (Vcc / 2) . __ Designed by Wilf Rigter
Dual Stepper Motor Driver for a Robot Differential Drive - This article describes the hardware and the software used to control two stepper motors suitable for a robot differential drive. The circuit accepts two 2-bit words that command each of the motors to go forward, backward, hold a position, or to idle. It also provides an output signal when a step is being taken. It is a flexible design allowing for unipolar and bipolar motors __ Designed by J. L. John Girard
Dual stepper Motor drivers using UDN2540 - The UDN2540B is a quad darlington power driver, manufactured by Allegro. Each output can sink up to 1.8A continuous. The typical applications include print heads, relays, solenoids, and stepper motor control. It is a replacement for L6221A. In this Dual stepper motor drivers design we use two UDN2540B to drive two stepping motors at the same speed. Each motor can be independently controlled. The S1, S2 switches control the ON/OFF and the moving direction of Motor1. The S3, S4 control the Motor2, respectively __ Contact: info @ wzmicro.com
Dynamo Current & Voltage Regulator - Useful for lovers of older cars, motorcycles and boats. __ Designed by Manfred Mornhinweg |
