Questions tagged [pwm]
Pulse-width modulation, is varying the duty cycle of a rectangle wave, usually with a constant frequency.
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How can I simulate SSB distortion caused by envelope delay?
Kahn first proposed envelope elimination and restoration (EER) in the 1950's to produce SSB with a nonlinear RF section. Modern IC technology makes it easy to produce the high-power AF envelope signal ...
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Control the duty cycle of my square oscillator
I Would like to know how i can control the duty cycle of my circuit.
simulate this circuit – Schematic created using CircuitLab
What is the best way to control the duty cycle ( from 1 to 99%) ...
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Using PWM to communicate between ATTiny85s
Some background: I am putting together a display to teach children about how neural circuits work. I am making a group of 'blocks' (each of which contains an ATTiny85, an indicator LED, and input/...
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Mosfet for switching a step-down for a 12V fan
I'm working on a circuit to control a 12V 4-pin PWM fan from an Arduino (that bit is working), and from a source of up to 42V.
Turning the fan off is what I'm having a problem with. I know some 4-pin ...
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Battery Type Buck Converter With Bootstrap MOSFET Driver
I have a device that used 2x 1.2 V NiMH batteries that I want to change to use a Li-Ion cell. I want to map the 3.3 - 4.2 V voltage range of the Li-Ion to the 2.0 - 2.4 V of the NiMH using PWM.
I use ...
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How to generate 6 phase shifted (60 degrees between each) PWM Signals?
I need to generate 6 phase shifted 5V PWM signals. I need to take a fitting microcontroller (now it is PIC18F66K22 I'm looking for easiest to make (previously I looked at STM32)). I want to know what ...
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Power controlling a soldering iron
I have used a single rectifying diode to lower power of 60W Chinese soldering iron due to overheating.
Though I am pleased with the result, I still plan to have variable power output for heavy ...
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Adjusting Voltage regulator with PWMed optocoupler
I have LD1084V adjustable voltage regulator powering servo and want to control its output from MCU. Optocoupler should behave as variable resistor so my thinking was :
I am mainly concerned with gray ...
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Replacement of 100k potentiometer with mosfet
In this circuit i want to replace 100k potentiometer. As in this type of circuit the output voltage is set by rotating the knob manually so i just want to make it automatically by giving pwm signal to ...
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AC dimming with STM32 timers
I'm using an STM32 for AC dimming, for which I use a GPIO output (or timer channel out) to drive a triac, whenever I get a zero crossing detection (rising edge). Is there a way to solve this only ...
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Is it nessesary to use PWM pin on LMD18200
I'm creating the circuit which has to apply direct and inverse voltage to the load and I want to use LMD18200. According to it's truth table, if I connect PWM to logic ...
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What is the correct way to control voltage on a mosfet
First Schematic with N-Mosfet
simulate this circuit – Schematic created using CircuitLab
simulate this circuit
I have a few question on these design. First designed has been built on a bread ...
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variable PWM frequency and duty cycle in real time
My project is based on a strict time management and precise event timing
for that I need to vary the PWM frequency and duty cycle in real time with two potentiometres.
I've succeded to vary the ...
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How to make current pulses
I want to make current pulses; the intensity of the pulses must go up slowly during a period of time until it reaches a maximum value.
I have thought of using a microcontroller to make voltage pulses ...
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PWM Low Pass Filter - struggling to get required output
simulate this circuit – Schematic created using CircuitLab
I'm trying to get a Raspberry Pi to give a clean, reasonably linear, 0-10V PWM signal to a device which takes in a PWM signal to ...
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Convert Arduino 5v signal to 12v signal for servo
I am by no means good at electronics or electrical stuff. I have recently got into the hobby by working on my own personal project. I want to be able to control a 12 volt servo motor that takes a 12 ...
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Processor speed for generating PWM at 1 MHz
I want to generate square pulses at around 1 MHz to drive an H-bridge inverter. Now, I want to choose a suitable microcontroller, microprocessor, or a DSP board.
I need to generate a few pulses (...
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Will putting diode like this work?
I know it must be a silly question to ask but I’m very new at electronics and I didn't knew if it is gonna work or not.
Please take a look at the positive input volts in the diagram
what I want to ask ...
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How to make transistor work like a switch controlled by a PWM signal
So, I need a switch that opens when a pwm signal is high(5V) and then when the pwm signal is low(0V) it has to close. I need this to switched power supply. I know that a transistor can be used to this ...
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Solenoid valve FET
I would like to drive a proportional solenoid valve (PVQ31 24V model from SMC) using a high frequency PWM.
I followed Olin Lathrop's advice to open a new topic.
He suggested to build a circuit ...
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