Questions tagged [pwm]
Pulse-width modulation, is varying the duty cycle of a rectangle wave, usually with a constant frequency.
3,050 questions
0 votes
0 answers
59 views
Generating two PWM signals from a PIC18F45K20
I'm doing an environmental control group project for my embedded systems module. I want to generate two PWM signals: Control fan speed from ADC readings from a TMP36 Dim an LED strip depending on ADC ...
0 votes
2 answers
110 views
Boosting the output audio signal of an ESP32 GPIO25 DAC pin
I am building a class d amplifier and need a PWM waveform created by comparing a triangle waveform (5Vp-p) with a audio waveform signal in a single supply (5V) LM311. My audio is coming from an ESP32 ...
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0 votes
1 answer
67 views
Sending PWM signal over Cat5
I'm trying to send PWM signal to MOSFET gate to control 12VDC 2A motor. The NE555 circuit is built as shown in this article (https://www.build-electronic-circuits.com/555-pwm-circuit/) with the same ...
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0 votes
3 answers
123 views
DC Motor regulated with cheap PWM regulator make electrical noise
On my camper with a 24VDC circuit, I've a small computer to show the water tanks level and a DC circulating pump with a PWM speed regulator bought on Amazon, regulating at 60% speed. The computer is ...
-1 votes
1 answer
54 views
Linear AC voltage to DC 5v or 10v PWM conversion
I have a vehicle with generator style speed signal generator and its output is linear from 0 -30VAC. This signal is used by the Dash mounted speedo without any issue. I now have a mandated requirement ...
7 votes
4 answers
1k views
Is it advisable to apply a square voltage (for example a PWM) to LEDs?
I intend to connect the output of a push-pull type buffer IC, SN74LVC2G34, to: a) a LED (for debugging and monitoring purpose) b) a gate driver IC (1ED3142MC12H) I simulated the following circuit to ...
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1 vote
1 answer
105 views
3 'Phase' BLDC Motor Control using Raspberry Pi 5
I am making a project to control speed and position of multiple 3 Phase BLDC Motors using a Raspberry Pi 5. I am struggling with the number of PWM channels I will need and the lack thereof on the Pi ...
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0 votes
2 answers
79 views
What is a systematic way of handling DC inrush currents?
Let's say I have the following setup: 24VDC PSU → PWM Dimmer with 5A outputs → Incandescent 24V 40W bulb While the 40W bulb consumes only ~1.5A, its inrush current is about 10A. The PWM dimmer has no ...
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0 votes
2 answers
131 views
Will 400 Mbps be enough to transmit a 5 kHz PWM signal?
PWM signal to be generated from MAX6966 at 5 kHz with duty cycle varying from 1% to 99%. This PWM signal is fed into a line driver SN65LVDS1. Then using a 10 meter shielded twisted pair of wire, this ...
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2 votes
5 answers
433 views
What is the best flyback protection circuit for a 12 V / 30 W solenoid driven by 2 kHz PWM when the diode cannot be placed directly across the coil?
I need some help choosing the best flyback protection circuit for an inductive load driven by PWM. I’ll attach a simplified schematic of my circuit along with test results for each protection method I’...
1 vote
1 answer
142 views
Voltage Spikes with PWM Controlled Brushed Motor
I have disassembled a 20V cordless drill. It uses a two-lead brushed motor controlled via a PWM signal. Out of curiosity I connected both motor leads to an oscilloscope and measured both against a ...
1 vote
1 answer
121 views
Flyback diode solution for inductive loads with GND loss and reverse polarity issues
I'm looking for advice on how to properly design a flyback protection circuit on the PCB for an automotive application, where the supply comes from a vehicle battery and the system must handle GND ...
0 votes
1 answer
104 views
PWM demodulator implementation
I was browsing the web for the prior works on the PWM demodulator implementations, and I found patent US4408166A, "Pulse width modulation decoder" from 1982. I cound not obtain the vo ...
1 vote
1 answer
71 views
How to calculate impedance across common terminal of PWM switch in buck-boost converter
In the book 'Fast analytical techniques for electrical and electronic circuits' by Vatché Vorpérian, the DC and small-signal equivalent circuit model of the buck-boost converter is obtained by ...
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-2 votes
4 answers
158 views
What’s the difference between using PWM and H-bridge circuits for controlling DC motors in robotics? [closed]
I’m working on a small robotics project and trying to control DC motors. I’ve come across terms like PWM motor control and H-bridge circuits, but I’m a bit confused. From what I understand, PWM is ...
