how to convert digital signal(PWM) into analog signal [duplicate]
This question already has an answer here: how determine the RC time constant in PWM digital to analog low-pass filter? 5 answers
View ArticleWhy do RC applications use such a small PWM duty cycle?
I know that RC applications, such as a drone, use PWM signals to drive the motors. This PWM signal is mostly 50 Hz (0.02 s). The pulse itself varies from 1 ms to 2 ms. So a 1 ms pulse corresponds with...
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Creating a PWM signal using PIC18F4520
I am trying to create a 100ms period pwm signal (10Hz) with a PIC18F4520, I followed the PR2 equation to help me create this signal I have a 20MHz clock frequency with a prescaler of 16 and a PWM...
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TPS40211 PWM LED driver topology
I’ve recently been trying to figure out an LED driver circuit for my 32V, 0.7A CoB emitter. I settled on the TPS40211, since it ticked all the boxed in terms of input voltage range, output, etc. I...
View ArticleWhat is the name for an IC that accepts an analog voltage and outputs a...
I want to isolate an analog signal. One way of doing this is to convert the analog signal to PWM, isolate the pulses with an optoisolator, and filter the PWM on the other side. Obviously I could do...
View Articlesine wave inverter [on hold]
Gd day evrybody.. i am trying to change a square wave inverter that i have to sinewave.. i programed atmega 328 to drive the half bridge mosfet irf064n.. atmega connected to gate through 200ohm...
View Articlehow to control a coil
I have been working on a project controlling a coil to attract a metal ball at high speed. I measure the speed of the ball in front of the coil and then decide how fast I want the ball to accelerate...
View ArticleUsing PWM to dim LEDs
Our high school theater is hosting a production, and a big part of the set is a giant turntable. It’s going to be cool and all, but I’ve been challenged with controlling LED strips on the turntable...
View ArticleTwo parallel motor under PWM now have slightly different speeds
I have a couple of peristaltic pumps to wash my cells with different conditions for live imaging with a fluorescence microscope. I now have the two pumps with a PWM pre-assembled module. It has a timer...
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MCU – What's going to happen if I put a PWM output pin right next to a bunch...
I’m currently considering a MCU-driven circuit that will do a variety of things, including drive some BLDC motors and do some analog sensing (of position sensors, temperatures and the like). The...
View ArticleMOSFET shorted after I connect them in parallel, what's wrong?
One of my MOSFET source-drain shorted after I connect them in parallel? So I was making an ARC speaker yesterday, and I used one MOSFET ( irf540), and it got really hot, but it did not blow up, so I...
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PWM voltage boost for mosfet
I need to run 12v motor with using Raspberry Pi. I made a circuit which works but then I noticed a “little” problem. Pi’s software PWM signal is only 3 volts so BUZ11 doesn’t open enough. I found this...
View ArticleAudio PWM on atmega644
I’m trying to generate audio through a 3.5mm jack using an atmega644. I tried following this tutorial, but even with the sampling provided, I only get a high-pitched whine. I did a lot of reading in...
View Articlewhat IC is typically used in a switched mode power supply for pwm voltage...
So what is used? do they basically run off of a something like a 555?
View ArticleCurrent limited fast PWM power Supply
I’m working on PWM power supply to supply a load which needs a constant current of 1 mA and 2.5V of operating voltage. The Pulse width Ton is 1 to 10 µs Maximum and Toff is 10 ms which results in a...
View ArticleTIM 2 PWM Input on different pin STM32F072B Discovery
I’m trying to change the pin, that is connected to TIM2 in PWM Input mode for frequency measurement. I just compiled the example, tested it and it works on pin PB03, however, when I try to change the...
View ArticlePWM a heatgun using a relay
I need to control a heatgun temperature. My heatgun have two different temperatures, one about 300° and another about 400°/500°(something like that) with 2kW max power at 220v. I’ve connected a...
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Help with low-pass filter and TTL logic interface
I am working with a motor control board which controls a DC motor (speed and direction). This board uses two SPDT relays for direction, and some sort of PWM for speed. Here’s an abbreviated schematic,...
View ArticleDetecting Specific PWM Signal Without Programming (Only Electronics Components)
I want to detect a specific PWM signal by electronic circuit components i.e. transistors, opamps, capacitors. update: I want to build simple ID system. I want to detect specific PWM signal for example...
View ArticleCan't get PWM to work on a PIC12F683 using MPLAB XC8
I’m trying to make PWM to work on the PIC12F683. According to my calculations I should get an 8 bit 20kHz PWM at GPIO2, but that does not happen. Instead I get a 5kHz “weird” PWM signal such that when...
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