Top Circuits Page 67
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This is a slightly revised version of the 6-transistor H-bridge designed by Mark Tilden and found on the BEAM Tek website (now only available via archive).
I encourage anyone interested in H-bridges to read Mark's article, as it gives an excellent....
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These circuits could be used as the basis for Model Railroad DCC Boosters or PWM motor controllers. The first schematic is for a basic 3 Amp - DCC Booster using the LMD 18200 CMOS, H-Bridge.
Included in the design is a 5Volt regulator that supplies....
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H-Bridge
This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it....
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The 555-based bistable circuit in Figure 1 can easily generate a pseudo-trapezoidal move profile. Note that the timing string of R1 and associated components does not connect to VCC, as it would in a normal circuit, but instead receives its power through a....
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Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates....
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The circuits on this page are for motor controls using Push buttons and would typically be found in commercial and industrial installations.
The circuits do not show the wiring of the motors themselves as this depends on the particular motor type. The....
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Mark Tilden`s 6-transistor H-bridge
Design, limitations, usage
This is the six transistor "Tilden style" H-bridge; while not as old as the original "basic H-bridge," this goes "way back," and is the basis for many BEAM driver circuits
* Up to 800....
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Reverse engineered circuit diagram of a motor speed regulator out of a portable pocket tape recorder containing a single motor for all functions. This circuit works amazingly well, keeping the motor speed constant regardless of shaft load and battery voltage...
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I found this circuit in my files. I don`t know where it came from, but it looks like I photocopied it from somewhere years ago. I have been told that it came from "The Robot Builder`s Bonanza", by Gordan McComb. Anyway, I thought that it should be fairly....
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The following diagram is for the main circuit of the motor driver.
A testing version is shown near the end of this page. It is laid out differently and shows the SN7474 in logic block form and LED`s are used to indicate the motor coils being switched...
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The circuit in Figure 1 shows an example of how you can use an integrated switching regulator (ISR) to efficiently vary the speed of a permanent-magnet dc motor. In this application, the rotating head of a robot senses the presence of an oncoming object....
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The block diagram in Figure 1 represents a complete remote-temperature-sensing and fan-control system. The system uses an Analog Devices temperature-monitor and fan-control ASIC and a PIC16C84 µC from Microchip Technology. The ADM1022 allows you to measure....
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Microchip Technology (www.microchip.com) offers a family of cooling-fan speed controllers that operate in PWM mode for use with brushless dc fans (Reference 1). To control fan speed using the PWM waveform`s duty cycle, you can use either an external NTC....
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The circuit is not particularly susceptible to motor transients and supports FULL STEPS FORWARD, FULL STEPS REVERSE, ACTIVE HOLD, and POWER OFF aka RELEASED. If the motor does not turn then swap around the leads of ONE of the two coils. To reverse the sense....
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Like most other ESCs, this one is built up using N-channel Power MOSFET`s because of their good characteristics (low DS resistance). Since this ESC has no reverse, it is not meant to be used in R/C cars or boats if reversed motor run is needed. It is more....
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The first servo controller project at http://www.rentron.com/servo.htm had the com port fixed at com1. This new version will seek out the available com ports on your PC and then let you select the desired port and baud rates. It has 1 additional servo port....
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This page shows some methods of track routing control for Stall-Motor type switch machines. The principle method uses a 2 Pole - Multi Position rotary switch while an alternate uses optoisolators and transistors to select the routes. The last circuits on....
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This 555 timer based PWM controller features almost 0..100% pulse width regulation using R1, while keeping the oscillator frequency relatively stable. The frequency is dependent on values of R1 and C1, values shown will give a frequency range from about 170....
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The circuit in Figure 1 is a simple, economic, compact, and tricky way of using the LM723 as a programmable voltage source to drive dc micromotors. Because of the µPs` accurate positioning and control, these motors are useful in applications such as optical....
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The purpose of a motor speed controller is to take a signal representing the demanded speed, and to drive a motor at that speed. The controller may or may not actually measure the speed of the motor. If it does, it is called a Feedback Speed Controller or....
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A simple, time-honored approach is to use one or more 74*245 chips (normally the 74AC245 is used for maximum current capability) to provide motor drive current. Here, each channel of drive power is provided by one or more buffer on the chip...
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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....
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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....
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Two inputs, A and B, control the bridge. With both high (or open circuit) both ends of the motor are connected to 0v. Connect A low and Tr2 turns on causing the motor to go forward. Connect B low and Tr6 turns on, reversing the motor. If A and B are both....
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This page features H-Bridge circuits used for controlling direct current motors. Several designs are shown using both CMOS and Bi-Polar power devices. These circuits could be used as the basis for Model Railroad DCC Boosters or PWM motor controllers. The....
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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...
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A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit....
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These two schematics are variations on another PWM circuit that I designed. The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET, the....
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This DC Motor Controller circuit will control a 12V dc motor. The system will have three pushbuttons: a START button, a REVERSE button and a STOP button. Initially, the motor must not be running. When the START button is pressed, the motor will run in one....
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You will find this identical circuit inside most 3 wire computer fans with speed monitoring output to the motherboard. Peel off the sticker from the fan hub in order to access a motor winding pin for connecting up the tacho circuit...
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The heart of the Chloroplast is the Motorola MC34164-3 Micro power Undervoltage Sensing Circuit (U1 in the following diagram). In normal use, this component monitors the voltage at pin 2, and applies a ground at pin 1 ( out ) when the monitored voltage drops....
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Figure 2 is a diagram of the control circuit
built on a 1.45 X 1.8 inch PC board. IC1 is
an LMC555 CMOS timer that generates a
200 microsecond wide clock pulses to step
the motor and control its speed. The speed
can be varied by changing the pulse....
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An electronic speed control for an AC Motor can be
designed with a Light Dimmer IC by limiting the minimum
firing angle of the triac so that the motor wont
stall. This can be done effectively for high volume applications
by making a minor change to the....
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This application note describes how to implement a compact size and high-speed
interrupt driven step motor controller. Step motors are typically used in applications
like camera zoom/film feeder, fax machines, printers, copying machines, paper feeders/....
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Battery run times for notebook computers and other
portable devices can be improved and acoustic noise
reduced by using Linear Technologys LTC®1695 to optimize
the operation of these products internal cooling
fans. The LTC1695 comes in a SOT-23 package....
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Figure 1 shows a block diagram for a fan speed control
system using the LTC1840. The LTC1840 contains two
current DACs used to gain full control over fan speed. The
scaled currents individually adjust the fan-driving output
voltage of a switching....
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Circuit shown in Figure 3-69. It applies to require frequent timing control motor reversing operation of the occasion. Drawing, thyristor Vl,..
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In some places, allowing only a specific direction by the motor running, even when the power supply phase sequence..
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The controller is a prototype and works well in my plane with 7 cells and a Graupner-Speed 600...
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For normal use it`s necessary to connect the battery, when the jumper is connected.
Please take care, that the transmitter is on and the throttle is set to "power off"...
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Controller for brushless
and sensorless motors, with active rpm control # Active rpm control
# Car mode
# Proportional brake
# Active freeweehling
# Updates via Internet available..
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No description available...
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If the transmitter stick-potentiometer delivers a voltage about 2 - 3 V, this circuit will be suitable. If you want to avoid using the battery cable (supplying Vcc for IC1and -2), you can use a separate 5V supply for IC1 and -2. In that case you should test....
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The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. I designed this circuit to use 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so....
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This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically open or close a pair of curtains. Using switch S3 also allows manual control, allowing for curtains to be left only partially open or closed. The circuit....
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The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit may be used in either 12 or 24 Volt systems with only a few minor wiring changes. This device has been used to control....
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This is an easy to build stepper motor driver that will allow you to precisely control a unipolar stepper motor through your computer`s parallel port. With a stepper motor you can build a lot of interesting gadgets such as robots, elevator, PCB drilling....
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Core multi-resonant circuit 40 L06 collapse is 1C.. Auxiliary electric f below its low threshold, open Icl. Output (2 feet) for the business l NIE., CI by D1 and Ri fast chargi..
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Current three-phase motor phase protection circuit, as shown in FIG. 3 homemade small current transformers Tl, T2 and T3 on the motor is running three-phase current detection s..
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DC brush motor driver circuit diagram MC33035 chip using a straight debate brush motor driving circuit ring shows a typical DC brush motor driver circuit diagram. 4 field effec..
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Delta connection Motor phase failure protection circuit as shown in FIG. Its protective role is as follows: The three resistors R, ~ R3 connected as an artificial neutral point..
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The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge + R discharge, notice the diode) is constant and equal to 22Kohm (givin a frequency of about 1Khz, notice the hum). When the....
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Transistor Q1 can be a 2N2222(A), 2N3904, NTE123A, ECG123A, etc. Not critical at all. It acts only as a switch for the relay so almost any type will work, as long as it can provide the current needed to activate the relay's coil. D1, the 1N4148, acts as a....
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This project it´s based on a PIC18F25K20, with the purpose of control a FAN with PWM (Pulse with Modulation). It offers a variable speed control, low acoustic noise, reliability, long lifetime, low power consumption, protection features. The MCU get the....
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The temperature sensor U2 needs to be located next to the item being monitored. As the temperature increases the motor duty cycle will increase. D1 and R2 are optical components, they only need to be installed for a visual indication of the current duty....
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Here is a design for a DC motor speed control featuring: Efficient PWM H-bridge MOSFET architecture. Supply (battery) voltage range from 4.2 to 13 volts. High current capacity for driving large motors (65 amps max). Input compatible with standard RC hobby....
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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....
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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....
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Pulse width modulation (PWM) is a technique to control analog circuits with a digital output. PWM is used in many applications, Specially to control light intensity and speed on motors. A PWM circuit makes a square wave with a variable width. The pulse width....
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This device acts as a variable speed control for the heater blower in a car. It takes its power directly from the existing wiring and connects with just 2 wires. It will also work for any 12 volt device up to 10 amps. A PIC12F675 provides all of the....
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Not every new use of technology requires a microcontroller. This one uses a 12 volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe from Home Depot, and a large plastic storage container from Big Lots.e food storage box whose lid....
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During summer nights, the temperature is initially quite high. As time passes, the temperature starts dropping. Also, after a person falls asleep, the metabolic rate of one's body decreases. Thus, initially the fan/cooler needs to be run at full speed. As....
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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....
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Most battery motor speed controllers are under manual control and the operator automatically adjusts speed to match demand. Under these conditions closed loop motor speed control is an unnecessary expense. However, when it is required, a tachogenerator can....
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Construction and operation of the brushless motor windings principle e Structure and working principle of the triangular coils As shown, through the switch, you can make the st..
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This is a circuit to use a standard, low quality opto isolator to transfer an analogue signal with reasonable linearity and without complicated feedback loops to monitor and linearise it. The circuit was designed to interface a mains driven thryristor motor....
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The second half controls the steering. The mechanical design is a 3 wheeled caddy with the ´single wheel´ actually a closely spaced pair of wheels which are driven by the main drive motor top provide motive power (this is the motor controlled by the first....
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This AC motor speed controller can handle most universal type (brushed) AC motors and other loads up to about 250W. It works in much the same was a light dimmer circuit; by chopping part of the AC waveform off to effectively control voltage. Because of this....
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The simplest of all motor controllers (besides a straight on/off switch) is the contactor controller. I designed this contactor controller for use in my electric scooter project. It is based around three 12V relays, two 12V batteries, two switches and of....
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The heart of the PWM Fan Controller is a PIC 12F675 microcontroller. This microcontroller is reading the analog output of a LM35 temperature sensor using a ADC (analog to digital converter) . The resulting digital value is converted to a temperature and a....
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A motor driver! I'm sure you knew that already but that's what it is. A motor driver is required in pretty much all walkers including all of my CW series walkers. You need to use it any time you need to supply more current to the motors because the circuit....
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When the fan seized up in my source and I changed it to a type with much less noise, turned on my computer, the largest source of noise CPU cooler fan. The computer I have a boxed Pentium III processor in slot 1, which is practically dismountable and fan....
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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,..
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The thyristor control circuit, with the bridge circuit to control the temperature in the contactor coil KM plus a secondary winding wound as..
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Fig. 3-100 is a two-speed motor stator windings lead wiring diagram 2Y/Y-connected. ..
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Fan motor driving circuit Shown as a simple fan motor driving circuit, which is mainly from the power circuit, the motor drive circuit portion constituted. The power supply cir..
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Fan power equipment traditional control methods is through manual or relay control, there is the problem of poor reliability and flexibility. For example, the motor capacity at..
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FIG, M is a variable speed motor control wicket opening and closing and opening. O electric governor. Front grid, hit the power switch SA A side, toggle switch S is opened; aft..
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FIG aa, bb, and ce three-phase windings, respectively. Double throw switch Kl-l ~ Kl-4 hit the left side, that switch l and 2 phase, at this time, aa and bb in series with the ..
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FIG circuit 3-200 (a) in Fig. When the reverse brake, forward contacts open contacts KMi, reverse brake contactor KM3 contact is disconnected, reverse contactor KM2 contacts ar..
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F to turn a water magnet, the stator coil into 4 groups. 4 stars all set of coils through mediums P pulse signals by the rotor control number, so as to form a rotating magnetic..
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Dual motor drive circuit Automatic tracking shows are constituted by two motors (white line) Cars structure, principle and double motor drive circuit. ..
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Drying the motor winding circuit current imbalance Below is a circuit diagram of the motor winding current imbalance drying: ..
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Electronic circuit steady speed motor applications Electronic steady speed mode is automatic remote control over the role of the motor power supply circuit to the motor to achi..
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Electrical flow through the saddle j pounds. TV added in a controlled manner Qian Mountain amphipod species lI- ii ~ mi pulsating chord electric Ir:., This electric IE again. a..
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Dong Fang Zhuo most governors are pulse width modulation, pulse position modulation DA foot of the circuit (the clock when called righteous side of the system). Manifold 555 ov..
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Electric valve control circuit consists of the following three parts: main lines, control lines, and power consumption brake line aa. The main circuit includes a power switch v..
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Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature,..
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When no light, photocell PC1, PC2 was high resistance, Q1, Q2 is turned off the relay contacts K1, K2 relay..
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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...
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Motor switch control circuit shown in Figure offers two speeds counter-steering i.e. two speeds in the opposite direction...
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Shown in forward and reverse dual interlock control circuit, on the basis of the..
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Electric shaver motor drive circuit It shows a typical motor drive circuit of an electric shaver. AC 220V to charge the battery through the charging circuit, but also for the m..
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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). ..
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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 ..
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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...
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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..
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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...
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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..
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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....