Top Circuits Page 68
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Motor is heating devices, by accident or overload often caused when the coil winding temperature is too high, as shown in FIG. 1-9 TC649 motor overheating protection and drive circuit. NTC thermistor RT close to the motor of the motor temperature detection,....
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Motor windings are scheduled to join Y Rong, while L IS ON, 2JC {}} electric suction, Union minister motor Y} i pick Save iIf /) f ~ tjj. ON 115 causes JMP - S also coat LU r + ashamed, to turn the motor was built gun delete, turn a motor built escape Wu j l....
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Ic, spread the use of electric comparator LM339c1 / 4), the potentiometer B to set the desired degree of construction, built-degree feedback signal by R., white A strong piece pressure point achieved, assuming a nephew increase the load speed r leaving..
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Miniature DC Motor Speed Control circuit b Having a steady speed function micro motor drive circuit steady speed Miniature DC motor control circuit shown in Figure 8-32. Ring (a) shows the voltage feedback mode is for tape recording machine miniature DC motor ..
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A three-phase electric motor is over- current protection circuit. How it works: This example circuit uses a transformer to sense the current, three-phase motor currents exceedi..
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A very nice radio control circuit can be used to control the circuit shown below in small motors. The circuit is very similar to the car radio remote control toy 7 function: fo..
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A very simple forward and backward drive motor control electronics projects can be designed using a low saturation voltage LB1948M 2 channels, forward-reverse motor control dri..
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A very simple single-phase brushless DC motor drive electronics items, you can use a DC brushless motor driver NJU7365 New Japan Radio Co., Ltd. by the IC design. NJU7365 is a ..
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AC contactor Cli suction units, motor was switched on at the same time, CJ1 pair of contacts to the thyristor SCR shorted SCR it off. Contactor C interesting by the diode DC vo..
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AC motor control circuit sprinkler If the circuit in the motor is an AC motor can be designed according to the circuit shown in FIG connection, work process and the principle o..
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Adjustment potentiometer RP, can change by the 555 IC A New Zealand into a square wave duty cycle of the square wave, the motor speed to achieve the purpose of the speed range ..
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All input is compatible with TTL. Each output is a complete totem pole driver circuit, Darlington transistors chip and pseudo-Darling source. Driver enable, 1,2 EN and drivers ..
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Almost open collector two outputs, open a withstand voltage of 60V, continuous conduction current of 0.3A, voltage drop typical type is 0. 4V, Zhang peak current of 9A. Can dir..
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As shown in Figure 3-105 2Y/2Y-connected two-speed motor stator windings lead wiring diagram. ..
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As shown in Figure 3-109/connection of two-speed motor stator winding lead wire connected coils, ..
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As shown in the three-phase motor with broken bars of inspection circuit: ..
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As shown is composed of 555 motor automatic governor circuit. The circuit composed of flip-flops 555 and a switch tube. R7 and motor in series to form a sampling circuit. RP1 c..
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Automatic washing machine motor driver schematic It shows the automatic washing machine motor drive circuit schematic. The circle of Narcissus XQB30-III-type washing machine mo..
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Below is a circuit diagram of the motor winding current imbalance drying: ..
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Bridge motor drive circuit Bridge motor drive circuit is shown, the driving stage of the circuit is 4 transistors. The control circuit is provided with four ends, through to A,..
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Brushless DC motor control circuit MC33035 and MC33039 uses a combination of the control circuit is shown in Figure A typical brushless DC motor control circuit, which is mainl..
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Brushless motor rotor, a stator and a drive circuit Relationship between the brushless motor rotor, a stator and a drive circuit is shown in Fig. The initial state illustrated ..
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By the PI.] P-type transistor VT2, VT3 and other components common emitter-coupled trigger (ie, Schmitt trigger device), equivalent to a switching circuit to detect a change in..
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By the main speed setting box FR-FG and the linkage setting operation box FR-AL (Mitsubishi inverter) multi motors synchronous operation. Circuit is shown. Using these two exte..
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C ,. C! Composition ratio circuit. Ri. C, constituting the shift shed circuit diode VDi - VD4 constitute destroy stream bridge, electric pit C4 is used - Application Filtering ..
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Check the three-phase motor with broken bars As shown in the three-phase motor with broken bars of inspection circuit: ..
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Circuit as shown below, when the three-phase circuit in any one phase, star point balance is broken, small relay J is energized, an external control contact action, immediately..
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Circuit can be used to control low power DC motor, series motor or shunt motor speed and direction. Motor and rectifier bridge G1 series, and then connected to the grid transfo..
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Circuit connection as shown in a, b, in which a star-shaped FIG winding shunt capacitance of the connection, Fig. B triangular winding capacitance in parallel connection. FIG W..
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Circuit is shown in Fig. 16-95 - 16-97. The electrode automatic adjuster has better performance. Such as the use of the accuracy high, good linearity current output type bridge..
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Circuit is shown. Motor using series resistance in the rotor winding start. Drawing, electrical velocity off the relay KIi ~ KI3 for motor short circuit protection; overcurrent..
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Circuit shown in Figure 16-105. Figure, MS synchronous motor. BQ its field winding; G AC excitation hair motors, BQG its field winding {empty box as part of the de-excitation. ..
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Circuit shown in Figure 3-104. in graph. SB2 is running at low speed button, SBi as the high-speed operation button. ..
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Circuit shown in Figure 3-107. Figure, SBi is running at low speed button, SB2 for the high-speed operation button. ..
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Circuit shown in Figure 3-108. SB3 for the forward button; S Island reverse button; SBi as low start button; SB2 to speed the start button; SBs for the stop button; KMs for the..
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Circuit shown in Figure 3-11. It uses a one-way thyristor control. Adjustment potentiometer RP, continuously changing the motor speed. ..
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Circuit shown in Figure 3-112. Figure, SBi as the first speed operation button, SBz is run by the second speed class. Two speeds in the same direction. ..
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Circuit shown in Figure 3-115. It uses contactors and double buttons, so when converting speed without press stop press ugly, can be directly converted. SBi, SBz button and SB3..
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Circuit shown in Figure 3-12. It has a variable speed and timing control functions. When the switch S placed in the 1 position, press the button SB, the motor starts running, a..
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Circuit shown in Figure 3-120. If the motor capacity is small (less than the rated current 5A), it can use an intermediate relay (contact a few more) instead of the contactor. ..
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Circuit shown in Figure 3-14. SA switch placed in the work position, the motor is transferred; SA placed bit is set, reverse the motor. Drawing, over-voltage protection element..
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Circuit shown in Figure 3-150. When shut down, the contactor KM1 released. KMz pull, 220V AC power supply through the diode VDi, VD2 rectifier, the motor primary and secondary ..
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Circuit shown in Figure 3-151. Figure 3-151 (a) of the capacitor banks connected into shape, it applies to shaped or Y-connected motor; Fig. 3-151 (b) of the Y-connected capaci..
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Circuit shown in Figure 3-16. It uses 555 IC A as the control element; capacitive step-down circuit; bidirectional thyristor V between the motor control intermittent operation...
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Circuit shown in Figure 3-175. Regulator connected between one phase and neutral. It applies to the rated voltage of 380V torque motor. This method than the degree of the imbal..
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Circuit shown in Figure 3-176. This adjustment method, the motor can run at equilibrium, adjustment range and relatively wide. But requires a three-phase voltage regulator, hig..
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Circuit shown in Figure 3-177. It uses two single-phase voltage regulator and connected to a V-shaped, single-phase regulators when two concentric series of time-linked slippag..
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Circuit shown in Figure 3-178. It withered speed torque motor for continuous casting machine, the circuit from the main circuit, trigger circuit, manual and automatic control s..
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Circuit shown in Figure 3-181. Main circuit consists of three thyristor Vi-V3 components. Trigger circuit single-junction transistor relaxation oscillator. Speed circuit has ne..
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Circuit shown in Figure 3-186. Figure, os for the isolation switch; QF vacuum circuit breakers; YR line for the circuit breaker coil; YA circuit breaker closing coil; SAi dashe..
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Circuit shown in Figure 3-189. Figure, SA controls switch; SBi is closing button; SBz to trip button; Yaa de-excitation switch is closing coil; YR3 is off trip coil magnetic sw..
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Circuit shown in Figure 3-190. The line in the armature circuit in series two startup resistor Ri, Rz, through the main switch SA to achieve start, stop and speed control. Duri..
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Circuit shown in Figure 3-191. The line in the DC motor armature circuit in series two-stage startup resistor Ri, Rz, Lee realized using the buttons to start and stop the motor..
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Circuit shown in Figure 3-193. Motor is separately excited DC motor. The brake circuit does not take measures, so the positive reversals alternately using delay action time rel..
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Circuit shown in Figure 3-194. Motor is re-excitation type DC motor. The motor has six terminals, sl, S2 for the armature windings; cl, cz for the series excitation (field) win..
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Circuit shown in Figure 3-196. The circuit has a resistance level start, under voltage relay KAz controlled by the startup resistor removed; shutdown, the use of dynamic brakin..
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Circuit shown in Figure 3-197. Dish adjust rheostat RP, can change the field current to change the motor speed. ..
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Circuit shown in Figure 3-201. The circuit has two starting resistor, starting resistor controlled by the time relay cut; SA by a master switch to control the motor reversing o..
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Circuit shown in Figure 3-41. This circuit Y- transfer process, contact KMi turned off again experienced a process of turning that motor is transitioned in case of power failur..
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Circuit shown in Figure 3-64. When the switch SAi placed in the work position, SA2 placed in the standby position, the motor is running Mi, Mz spare. When downtime occurs when ..
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Circuit shown in Figure 3-72. The circuit uses deformable bistable reversing motor control circuit automatically run and stop there during the time delay (time adjustable), to ..
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Circuit shown in Figure 3-92. It uses dual-phase sequence protection relay sense. When the power positive phase sequence (U, V, w), following the electrical KA pull. If the pow..
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Circuit shown in Figure 3-93. It is coupled with optical phase sequence protection relay. ..
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Circuit shown in Figure 3-96. Figure, SBz is running at low speed button, SBi as the high-speed operation button. SB3 for the stop button. In this circuit, a motor connected in..
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Circuit shown in Figure 3-97. The circuit only two contacts, the circuit is simple, but only applies to the following 2kW dual speed motor. Figure, SBi is running at low speed ..
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Circuit shown in Figure 3-98. Motor starting and low-speed operation is controlled by a switch SA. Adjust the time relay KT, the motor can be changed from low speed to start hi..
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Circuit shown in Figure 3-99. The low start-up circuit to the motor ( shaped connection), then automatically accelerated speed into high speed (2Y-connector) operation. Start f..
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Circuit shown in Figure 4-2. It uses two thermal resistors, a (Rc,) is used as overload protection, another (Rt :) used as an alarm. ..
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Circuit works (only the relevant parts of the manual draw mode): Figure a shows a circuit schematic circuit; Fig. B Typical electricity as conventional secondary circuit road; ..
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Collaboration with the dancers balanced bridge long on the porcelain unit Sync adjustment rheostat speed control system shown in Figure 3 to 183 in FIG. Others, such as electro..
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Figure 3-118 automatic acceleration control circuit. It uses the male contactor time relay, the motor starts automatically from a low speed by the speed the transition to high-..
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Figure 1 illustrates the simplified block diagram of a typical high-speed data converter system. The system consists of a bandpass filter, ADC, high-frequency clock, high-speed storage device, and post processing unit. Aside from the MAX104, the....
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The design in Figure 1 is a visible optical link for those who need to see the transmitted data. An isolation figure of more than 5000V is a bonus. Tests of the system used the COM input of a data-acquisition system, as well as a standard PC`s COM port. The....
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Another method that helps program development besides a dot LED as the output device is a serial bit. With a serial transmission to a terminal emulator program, developer may then test program running easier than a dot LED. One of my circuit uses PIC16F84....
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The method in Figure 1a needs no access or knowledge of the communicating devices. A C program opens two COM ports and installs interrupt-service routines for IRQ4 and IRQ3. Upon the reception of an interrupt, the routine stores a byte in a common circular....
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The circuit consists of two sections, one being a DC/DC
converter and the other being a pair of dual N-channel
MOSFETs and their associated high-side drivers that effectively
form a DPDT switch...
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The rapid, widespread use of 3.3V logic circuits complicates
the selection of RS232 interface circuits. The optimum choice
of an interface circuit should be based upon several application
dependent factors:
1) Logic circuitry connected to interface chip....
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The RS232 transceiver supports both RS232 and EIA-562
standards, whereas the RS485 transceiver supports both
RS485 and RS422 standards. The logic input (MODE) selects
between RS232 and RS485 modes. With three additional
control logic inputs (RXEN, DXEN....
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While the normal PC hardware might well run with just Tx, Rx and Ground connected, most driver software will wait forever for one of the handshaking lines to go to the correct level. Depending on the signal state it might sometimes work, other times it might....
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A state-of-the-art silicon temperature sensor like MAX6577 measures a remote temperature far from
the host system. The temperature sensor converts this temperature into a square wave with a
frequency proportional to the absolute temperature of its package,....
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PBUS is an RS485-like multi-drop bus for interconnecting PIC and other microcontroller-driven devices. Protocol and software is written by Jap. Just include a separate pbus library file into your project and add your command handlers for the specific device....
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Hand held computers are rapidly moving to 3V logic to save
power. Yet higher voltage buses are still utilized elsewhere in
the system for display driving and other functions. The
LT1330 is functionally equivalent to the LT1237 but operates
from 5V with a....
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4X4 matrix keyboard system settings, including 0 ~ 9 numeric keys. A ~ F as function keys. The main function of the keyboard is complete parameter settings, display mode select..
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Figure 1 shows a simple, cost-effective way of providing these bias voltages. A step-up regulator, IC1, forms the heart of the circuit. This regulator switches at a constant frequency of 1 MHz and a fixed duty cycle of 70%. IC1 steps up the input voltage to....
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I recently needed to control nine seven-segment displays for a microcontroller`s serial port. The complication I faced was the need to provide a continuous brightness adjustment for all the digitsfrom completely dark to fully bright. I couldn`t easily use....
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Flat-panel LCD monitors offer excellent image quality and more compact form factor than CRTshence, their steadily increasing popularity. Unfortunately, the complexity of their manufacturing process makes LCD monitors considerably more expensive than CRTs.....
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This project is a self-contained serial terminal using a PIC16F84 microcontroller chip, an inexpensive LCD character display, a keypad, and very little else. It is full-duplex, meaning keypresses cause RS-232 output, and RS-232 input makes characters appear....
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With the advent of HDTV and DVD video, there is a
renewed focus on RGB and color-difference component
video to maximize picture quality. LCD displays have also
entered the mainstream for high-end and portable computer
displays. These applications often....
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The circuit in Figure 1 saves I/O pins. It uses an 8051 µC, and only four I/O pins (P1.0 to P1.3) drive the LCD, instead of the 11 pins other displays require. Data transfers in a serial mode through the P1.0 port of the µC. The µC interfaces to Pin 2 of....
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Large LCD (liquid crystal display) displays designed to
replace CRTs (cathode ray tubes) in desktop computer
applications are becoming available. The LCDs reduced
size and power requirements allow much smaller product
size, a highly desirable feature...
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Since the output buffer of P1 can sink 20mA (each output pin, but maximum IOL for all outputs was limited at 80mA), thus we can use P1 to drive LED display directly. As shown in the circuit, Two common-anode 7-segment LEDs are connected to P1 with 180 Ohms....
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This is the construction guide for the 5301 wideband fuel mixture display kit. The 5301 is the Tech Edge version (rather than the Jaycar version) of the modified Silicon Chip FMD design, and it features, compared to the original kit, double sided PCBs a new....
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The circuit in Figure 1 is an effective driver for LCDs. The circuit comprises two main sectionsthe ICM7211 drivers (IC2 and IC3) and the YN06 display itself (IC1). The Intersil (www.intersil.com) ICM7211 is a 4-bit LCD driver that needs no external....
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The heart of the circuit is the tone (pitch) display section, based on the popular LM3914 display driver. This device drives ten LEDs in a linear display, with programmable endpoints and the choice of "dot" or "bar" modes of operation. Furthermore, it is....
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You can connect seven-segment LCDs using only a two-wire interface (Figure 1). The two-wire interface may be at the field-effect, direct-drive LCD or at a serial interface (such as I2C) that uses an eight-pin microcontroller. The design in Figure 1 uses an....
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A practical 92% efficient LCD backlight design is a classic
study of compromise in a transduced electronic system.
Every aspect of the design is interrelated, and the physical
embodiment is an integral part of the electrical circuit. The
choice and....
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The circuit in Figure 1 is a dual, grounded-lamp backlight
inverter that operates from an input of 9V to 24V, delivers
current from 0mA to 9mA per CCFL and has a dimming
ratio greater than 100:1. The LT1768 in the circuit is a
350kHz fixed frequency,....
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Its an adaptation of the 2X 16 LCD project, by adding a fettite loop antenna, two resistors, and a capacitor. Here the display shows the output of the 10 bit scanning voltmeter with Minimum Mass Wireless Coupler. Both the ferrite loop antenna and the....
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This project is provided as a "prototyping project" as no PC board has been produced. The photographs show the project built on a matrix board using surface-mount components and very fine wire.
The final design will require a double-sided board with....
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Your 5x7 display is my favourite toy; the tunes and graphics in the elevator display always impress my mates!
Since building the display I developed my own 400 dot matrix using a pic and the SN74154 [4bit binary to 1 of 16 demultiplexer\counter] - in place....