Wednesday, November 30, 2011
MC3479 Stepper Motor Driver
The output can deliver up to 350 mA each of the two coils of a stepper motor 2 phases. The change of output state occurs in the low to high transition of the input clock pulse. The new output will depend on the exit of age and state of the digital inputs. The output L1 to L4 are the results of high currents, which when connected to a stepper motor a two-phase full-bridge two formations.
Resistors R1 and Rb, Zener diode D1 and IC2 MC14049UB are additional components that are used in the circuit. R1 is an uprising and resistance Rb is used to set the maximum output sink. Zener diode D1 provides back emf protection.
Thursday, August 18, 2011
DC Motor Controller Circuit with NE555
A PWM circuit primarily based on timer NE555 is that the heart of this circuit. NE555 is wired as an astable multivibrator whose duty cycle will be adjusted by varying the POT R1. The output of IC1 is coupled to the base of transistor Q1 that drives the motor according to the PWM signal available at its base. Higher the duty cycle the typical voltage across motor will be high which ends in higher motor speed and vice versa. modification of DC motor direction is attained using the DPDT switch S1 that on application simply toggles the polarity applied to the motor.
Friday, July 22, 2011
741Op-Amp based on DC Motor Controller Circuit
741 Op-Amp PinoutFriday, April 15, 2011
Two Speed Contactor DC Motor Controller Circuit
The simplest of all motor controllers (besides a beeline on/off switch) is the contactor controller. I advised this contactor ambassador for use in my electric scooter project. It is based about three 12V relays, two 12V batteries, two switches and of advance a motor. Having no silicon to “fry”, it is absolutely reliable and robust. A contactor ambassador works by rearranging the two (or more) accumulation batteries amid alternation and parallel. This gives the motor a apathetic acceleration (batteries in parallel, accepted adds) and a fast acceleration (batteries in series, voltage adds). This assures that both batteries are absolved equally. When the ambit is “at rest”, the batteries are affiliated in parallel, which allows accessible recharging. Notes
1. S1 closes K3 and appropriately causes M1 to operate. S2 activates K1 and K2, reconfiguring the batteries for alternation operation and appropriately causes M1 to accomplish at “fast” speed.
2. B1 and B2 should be called based on the accepted requirements of M1. Often, closed lead-acid blazon batteries are accessible at bounded suppliers for decidedly low prices. These batteries are ideal for things such as scooters, go-karts, etc.
3. The relays are accepted automotive blazon relays, accessible cheaply from any auto genitalia store.
4. Your motor will depend on your requirements. 12V motors will commonly run accomplished at 24V, and carnality versa.
5. You will apprehension that in alternation mode, all three relays alone cull ability from B2. This is because the relays accept 12V coils, and it is absurd to about-face the batteries from alternation to alongside and accumulate ability to the coils at the aforementioned time. This does, however, beggarly that B2 is absolved slighty afore B1. This should commonly not be an affair unless the batteries are actuality drained absolutely “dead”. Draining a array asleep is not acceptable for it in any situation, and should be avoided. If you wish, you can use a baby 12V array to run the relays separately.
6. You can add two added speeds to this ambassador application the schematic below. It connects at credibility A and B apparent aloft on the ambassador schematic.
Wednesday, May 12, 2010
L297 Stepper Motor Controller Circuits
This accessory has some appearance like it requires alone clock, administration and approach ascribe signals. Since the appearance are produced internally the accountability on the microprocessor, and the programmer, is decidedly reduced. This accessory is army in DIP20 and SO20 packages. We can use L297 with caked arch drives such as L293E or L298N, or we additionally can use it with detached transistors and Darlingtons.