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Micro-step driver-connect a bipolar steppe Motor to a PC through the parallel port - This circuit allows to connect a bipolar step motor to a personal computer through the parallel port. The circuit is, for safety reasons, optically isolated from the PC and it allows to manage motors up to 3A for phase. Moreover, the digital interface allows to connect up to six motors to a single PC parallel port. __ Designed by © Vincenzo Villa
Microstepping stepper Motor driver with PBM3960 & TEA3720 - This Microstepping motor driver offers a short cut to get familiar with microstepping. It is a complete system to driver the bipolar stepper motor in micro-stepping mode as well as the half step and full step modes. This board is built around the Ericsson PBM3960 (NJR NJU39610) microstepping controller and TEA3718 stepper motor driver __ Contact: info @ wzmicro.com
Miller solar engine - The Miller solar engine uses a 1381* voltage detector (a. k. a. , a voltage supervisor) IC to drive a voltage-based (type 1) solar engine. The 1381 is normally used to reset CPUs and Micros when the power supply drops too low for reliable operation. So 1381s detect and switch when the input voltage crosses the rated upper and lower threshold voltages. The upper- and lower-switching voltages are slightly overlapped so that the turn-on voltage is a few hundred mV above the turn-off voltage. This hysteresis keeps input noise (around the switching threshold) from resulting in multiple output cycles as the transition occurs. __ Contact: Eric Seale
Mini Drill Variable Power Supply - T1 steps down AC voltage from 115VAC (Tony van Roon's or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc. C1 filters off the AC ripple. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. The output voltage is variable with the 10K-potentiometer while keeping the current constant __ Designed by Tony van Roon VA3AVR
Miniature Real-Time Controller - My long history homeuse controller, a Miniature Real-time Controller controls night light, A/C, household appliances with programmable scheduler. Modified source code and hex file for year 2002 readout. New source code in c program. __ Designed by Wichit Sirichote
Modify Servo Motor for Continuous Movement - Servo motors are widely used in precise control applications, but most of them can rotate up to 180 degrees only. Presented here is a process for modifying servo motors so that...__ Electronics Projects for You
More stepping Motors - There are so many ways to drive a stepper motor, Here is another circuit that use 74LS194 4 bit bi-directional universal shift register as a phase generator and UDN2543B to drive the unipolar stepper motor. U1 74LS04 provide the necessary clock pulse for the circuit. S1 is the direction selection switch and S2 turns ON/OFF the motor. __ Designed by www.wzmicro.com
MOSFET switch provides efficient AC/DC conversion - 02/17/00 EDN-Design Ideas - Occasionally, you have access to a transformer for powering a dc circuit, but its output voltage is much higher than that required for the dc voltage. The full-wave-rectified and filtered output of an ac input voltage V X , is V DC =1.414V X-2V F , where V F is the forward drop in the rectifier (approximately 0.7V) . Design by Spehro Pephany, Trexon Inc, Toronto, ON, Canada - February 17, 2000
MOSFET, Inverter 12 volt unit - A Very Reliable, Efficient and Practical Design. Do Not ask how to Build this for Power ratings over 1000 watts, That is NOT Practical. __ Designed by G.L. Chemelec
Motor Control through PWM - Motion control plays a vital role in industrial automation. It is required in manufacturing plants of industries like chemical, pharmaceutical, plastic and textile. And it may be a flat-belt application, flow-control...__ Electronics Projects for You
Motor controller operates without tachometer feedback - 12/09/99 EDN-Design Ideas - Speed controllers have long exploited the reverse-EMF characteristics of dc motors to control their speed. These linear driver circuits use power op amps to create a negative resistance drive to the motor that counteracts the voltage drop in the motor's
Design by Bruce Trump
Motor driver-74*245-based - A simple, time-honored approach is to use one or more 74*245 chips (normally74AC245 is used for maximum current capability) to provide motor drive current. Here, each channel of drive power is provided by one or more buffer onchip. __ Designed by Wilf Rigter
Motor PWM - The speed of a motor can be adjusted by this circuit, from 5% to 95%. __ 555-Timer
Motor Speed Control - This circuit will allow you to control the speed of an AC motor, for example an electric drill. The way that this circuit works is as follows. The bridge rectifier produces dc voltage from the 120vac line. A portion on this current passes through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100 ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode D1 protects the circuit from reverse voltage spikes. The ratings of the bridge rectifier and the SCR should be 25 amps and PIV 600 volts. The diode D1 should be rated for 2 amps with PIV of 600 volts. The
Motor Speed Regulator - This circuit regulates the speed of a small drill motor I use for PC board work. It is much handier for delicate work than a larger AC powered tool. The tool I have came with a useless 9 volt AC adapter. The motor would whine at high RPMs unloaded, but wo __ Designed by Andrew R. Morris
Motor-control scheme yields four positions with two outputs - 02/07/02 EDN-Design Ideas - Figure 1 shows how to position a mechanical device into four discrete positions but with only two free outputs and one free input from the control system. The position depends on a set of cams and four corresponding limit switches. The 24V-dc motor comes with a worm gear. Darlington transistors Q3 to Q6 and resistors R7 to R12 form an H-bridge that drives the dc motor, M Design by Jean-Bernard Guiot, DCS AG, Allschwil, Switzerland
Motor-controller operates Without Tachometer Feedback - 12/09/99 EDN-Design Ideas - This circuit uses a back-EMF for motor speed controlling to make a voltage controlled motor speed controller / Speed controllers have long exploited the reverse-EMF characteristics of dc motors to control their speed. These linear driver circuits use power op ampsPDF has several circuits, please scroll to this one Design by Bruce Trump, Burr-Brown Corp, Tucson, AZ
Motor-controller uses fleapower - 09/25/03 EDN-Design Ideas - A simple, permanent-magnet dc motor is an essential element in a variety of products, such as toys, servo mechanisms, valve actuators, robots, and automotive electronics. In many of these applications, the motor must rotate in a gi Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK
Motorized Video Camera Mount - This article describes a motorized, waterproof mount for a miniature video camera. If a suitable waterproof camera is used, this unit can be used outdoors. __ Designed by G. Forrest Cook
Multiple voltage power supply - Schematic only, no circuit description __ Designed by Andy Wilson |
