Vacuum Tubes Valves
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AC to DC & DC to DC
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Switching Power Supplies
Light Laser LED
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Data Bus Circuits
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RF Converter Circuits
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Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
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Regulated Power Supply
4 Band Resistor
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Motor Control Circuits
Motor Control Circuits
Pwm motor speed control
Speed control is accomplished by pulse width modulating the gates of two MGP20N45 TMOS devices. Therefore, motor speed is proportional to the pulse width of the incoming digital signal, which can be generated by a microprocessor or digital logic. The incoming signal is applied to comparator Ul, then to paralleled inverters U2, U3, and U4 that...
Stepping motor driver
Stepping motors find wide use in disk drives and machine control. MOSPOWER transistors are ideal motor drivers because of their freedom from second breakdown. Note that snubbing networks are not used because load line shaping is not necessary with MOSPOWER and the inductance of the motor is fairly low so that the inductive spike is small. The...
Motor speed control circuit
A shortcoming of the above bi-directional proportional motor control circuit is that with the potentiometer in its center position the motor does not stop, but creeps due to the difficulty in setting the potentiometer for an exact 1:1 mark-space ratio from the flip-flop. This modified circuit uses a second potentiometer, ganged with the first...
Back emf motor speed control
The use of power MOSFETs allows a direct interface between logic and motor power, which permits circuit simplicity as well as high efficiency. This speed control circuit can be packaged on a 22-pin, double-sided, 3.5 4-in. pc board. A 12 V control supply and a TRW BL11, 30 V motor are used; with minor changes other motor and control voltages...
Dc motor speed control 2
Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers' push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages' saturation drops) across the motor in either direction. The circuit uses a mechanically-coupled tachometer to provide...
Two-phase ac motor driver
Because of its high amplification factor and built-in power-output stage, an integrated power operational amplifier makes a convenient driver for ac motors. One op amp can be configured as an oscillator to generate the required ac signal. The power-output stage, of course, supplies the high-current drive to the motor.
Three-phase factor controller
The modified power-factor controller, developed at the Marshall Space Flight Center, employs a phase detector for each of the three phase windings of a delta-connected induction motor. The phase-difference sum is the basis for control.
AC motor control
The circuit illustrates feedback speed regulation of a standard ac induction motor, a function difficult to accomplish other than with a costly, generator type, precision tachometer. When the apertured disc attached to the motor shaft allows the light beam to cross the interrupter module, the programmable unijunction transistor, Ql, discharges...
One variable speed single-phase motor circuit thyristor
3P10 circuit shown in FIG. It uses a bidirectional thyristor control. Adjustment potentiometer RPi, can change the minimum motor speed f adjustment RP2, continuously changing t
2Y-Y-2 - connection four-speed motor switch control circuit
3-119 circuit shown in FIG. By combining switch SA, realize stator windings, 2, Y and 2Y connection corresponding to the motor speed n1
UC3625 brushless DC motor open loop speed control
28 is 45V/8A brushless DC motor driving circuit diagram. It is an open voltage-controlled, adjustable by one pin external potentiometer adjustment of the PWM duty cycle, the av
Synchronous motor thyristor excitation circuit
The excitation device for light duty synchronous motor 625kW initiated. Triggering the device circuit consists of three
Single-speed motor excitation from the electrical braking circuit
Circuit shown in Figure 3-151. Figure 3-151 (a) of the capacitor banks connected into shape,
DC motor excitation current circuit
FIG, T is the excitation transformer, R, varistor, rectifier diodes to protect against VDii ~ VD16 breakdown; Rz, C2 resistive capacitor protection
A high-power DC motor overcurrent protection circuit
R "h sampling circuit limit order _" to reduce the sampling resistor. Plus DC voltage level can be placed between the
Timing SCR control motor reversing circuit
Circuit shown in Figure 3-69. It applies to require frequent timing control motor reversing operation of the occasion. Drawing, thyristor Vl,
Only one-way operation of the automatic control circuit of the motor
In some places, allowing only a specific direction by the motor running, even when the power supply phase sequence
Multifunctional motor protection circuit
Circuit works: When normal inspection work where the voltage across the resistor R2 through, RP, partial pressure, as the input signal of IC4. IC4, R3 ~ Rg,
Eight PTC phase asynchronous motor protection circuit
The thyristor control circuit, with the bridge circuit to control the temperature in the contactor coil KM plus a secondary winding wound as
NTC protection circuit three-phase asynchronous motors
Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature,
Flashlight circuit diagram of a motor control model
When no light, photocell PC1, PC2 was high resistance, Q1, Q2 is turned off the relay contacts K1, K2 relay
Capacitor start single-phase induction motor circuit
Capacitor start single-phase induction motor circuit configuration, in order to form a two-phase rotating magnetic field, starting winding and capacitor in series, the same magnetic field can be formed automatically.
Switching two-speed motor control circuit
Motor switch control circuit shown in Figure offers two speeds counter-steering i.e. two speeds in the opposite direction.
Double interlocking three-phase asynchronous motor control circuit
Shown in forward and reverse dual interlock control circuit, on the basis of the
PWM DC motor speed control circuit
Circuit works: At present, although the most commonly used method is to pulse width modulation speed, but the circuit is a pulse position modulation (when known as pulse modulation).
Structure and working principle of brushless motor windings
Structure and working principle c brushless motor windings Structure and working principle of the triangular coils As shown, through the switch, you can make the stator coil
Electromagnetic brake motor frequency control circuit
Electromagnetic brake motors from the motor and electromagnetic brake NB ordinary composition. Circuit is shown. Figure, FR is the forward run and stop command terminal; intermediate relay KA is used to control the motor started.
A three-phase motor phase automatic protection circuit
Penetrate the motor phase line with a transformer when the induced voltage is ov. When one phase or two-phase or three-phase serious imbalance, transformer induced voltage rises rapidly, resulting in the transistor base current after rectified immediately
IN8510 and power motor driver circuit composed of DAC7520
BTS412B as two high-side power MOSFET switch and two BU271L 50v for the low-side switch, can be composed of bi-directional H-bridge DC motor drive circuit shown in Figure 11-1l. The circuit is an electrical automatic doors design, continuous current up to 6A.
NTC phase asynchronous motor protection circuit
Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature, temperature error of 5. Its reliability, small size (diameter 3. Smm), easy to install, easy to embed winding, use it as a temperature sensing element can
Two electric motors on the mechanical brake circuit
Circuit shown in Figure 3-157. The circuit can be used motor capacity of not more than llkW and require precise stopping of the occasion. Shutdown, contact KMi release, Mi and M2 motor stator winding is formed of three rectifier circuit and three short road circuit.
TC649 motor drive circuit with overheat protection
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, RT,
Stepper Motor Circuits
Remote Control Circuits
Direction Finder Circuits
Power Control Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial