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Help for PWM circuit for 12 volts DC up to 1.3 A
Is there a way to do a fairly simple PWM circuit that will handle 12 volts DC up to 1.3 Amps? The 555 timers appear to fall in the 600 mA to 900 mA max power dissipation range. Attached is the basic...
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PWM controlled variable resistance
I found this circuit design for constructing a variable resistor. Its seems that the resistance can be controlled by the duty cycle of PWM on MOSFET. Would you explain what is the purpose of having...
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130V DC Motor Control
I am interested in building a control circuit for a motor. More specifically this motor. The model I want to control is the 130V model, 0.48A, which should make it at ~62W for the motor, and 1/17 HP....
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BLDC motor control PCB
I am trying to make a PCB to control a Sensorless Brushless motor. I just wanted to know if it looks right. The IC I am using is a TB6588FG it has a 2.5A peak output current. I want to use it with this...
View ArticleHow to choose what a power supply to drive 2 x 10watt RGB LEDS?
I’m trying to figure out how to determine what power supply I should be using for different types of LEDs for this and future projects. I have 2 x RGB LEDS: Forward Current: 350mA Forward Voltage: RED:...
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Is it possible to use a ULN2003A Darlinghton array instead of multiple TIP120...
Looking at the datasheets, I’m not sure their specifics match; TIP127 and ULN2003A My intention is to do something like this, but with the ULN2003A, that I have already: The reason why is that I want...
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driving LEDs via a PI a attiny and TLC5940 (validation) and possible powering...
at the moment I am planning my first real (big) electronics project. I want to build a LED lamp, that can be controlled by a RaspberryPi (for e.g. programming a binary clock or changing the brightness...
View ArticleMSP430 PWM Dead-Time
According to the internet, the MSP430 has no hardware implemented to maintain proper PWM dead-time as the PWM duty cycle is modified. Apparently (and also according to the internet) this feature can be...
View ArticlePulse frequency for a pulse width modulation application
How can I determine the pulse frequency for a DC motor speed control or an LED brightness control. I have no data about the DC motor and led frequency dependence they both do not provide anything about...
View ArticleEliminate PWM noise in PWM-driven bidirectional motor
I need to drive a DC motor with PWM, through a H-bridge. The controller can’t generate PWM at ultrasonic frequencies with resolution I desire, and the low-end of the spectrum (~100Hz) may be too slow...
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Sin signal from PWM
I wrote a program in order to use Pulse Width Modulation to simulate a sinusoidal signal. Added a low pass filter to get rid of the noise and the traces of it being a discrete signal. Added a half...
View ArticleBuild variable resistor controlled by Arduino
I would like to build a variable resistor that can be controlled by Arduino. My plan is to vary resistance between the two values, i.e., 1 ohm to 10ohm, to continuously change the load for a small wind...
View ArticleHow to increase frequency to 13.56MHz in 12V 20A PWM? [on hold]
How to increase frequency 100Hz to 13.56MHz in 12V 30A PWM?
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Inductor calculation for DC to DC converter
How can I calculate the value and characteristics of inductor in a DC to DC converter?
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How does this motor drive circuit work?
The Drive terminals are connected to a PWM signal generated by an arduino micro controller. The purpose of this circuit is to isolate the arduino from the motors to avoid too much current being drawn....
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Using 3 Channel Video Switcher Module with Arduino
Hey all I am wondering how to go about switch from camera 1, 2 or 3 using this 3 Channel Video Switcher Module on ebay here. Since there’s only V+, V- and signal for the “switch” it looks to take a PWM...
View ArticleIs there a difference between 100% duty cycle PWM and continuous current?
I was thinking that 100% duty cycle PWM always keeps output HIGH ( just like a continuous current ) but according to Proteus simulation the output still falls and rises in a very little time Is that...
View Articlecan I drive 100 or so LRAs with WS2811 controlling DRV2603?
I would like to make a suit with 100 or more individually controllable Linear Resonant Actuators. Texas Instruments makes this http://www.ti.com/lit/ds/symlink/drv2603.pdf which take a PWM as an input...
View ArticleTorque control with H-Bridge via direction pin
Using the LMD18200 (H-Bridge) and the LM3524D (PWM regulator) I should design a torque regulation. I’ve found a circuit in the LMD18200 datasheet which uses the current feedback to adjust the PWM. The...
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Scaling 12V PWM signal to 0-10V
I’m trying to translate a 3.3v PWM signal through an optocoupler to the 12V side of a circuit, filter it to obtain a relatively clear DC voltage, and scale that to 0-10V for a control element. So far,...
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