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PWM with MOSFet- make it linear
there maybe wrong assumption in my question , so forgive me, i am here to learn . So controlling a light(LED) with MCU that outputs PWM, into a MOSFET N-CHANNEL, as described in this little image: so...
View ArticlePWM AVR Atmega16
How can I use PWM in atmega16 with another ports (for example: PB0, PB1, PA0, etc.) and show the LED fade in and out slowly? I tried to do it but the LED only duffenly turn on-turn off, not fade...
View ArticleControl inverter using Arduino PWM output
I’d like to control a frequency inverter using an Arduino Uno board and inverter analog input, in order to control AC motor speed. To do this I need to vary inverter analog input voltage. Inverter...
View ArticleReplace an Analog Pot with a digital one?
I have a Boost converter with a constant current mode that allows me power a high power led (Vf 34, 3A). I’d like to be able to control the current potentiometer on this device with an arduino. To do...
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Closed-loop gain with source degenerated amplifier
The following circuit needs is modeled with parasitic capacitances to be analysed in frequency. I need to drive it with an MCU that can output a signal that can be some tens of kHz and I need to see if...
View ArticleHow to reduce 28 V to 24 V under load?
I need to PWM control six 24 V DC fans with a total load of 10.6 amperes. That’s easy, right? Just PWM to a few MOSFETs. However, my system voltage is 28 V. At 28 V I’m out of specification for the...
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PWM Drive Simulation
I’ve been trying to follow an example circuit that does some PWM. First I believe that in a configuration something like this with nor & and that the wave should alternate. Violet line is pulsing...
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The Transistor Menace – Questions regarding an Arduino rgb LED project
I’ve been browsing this forum and the internet now for a couple of days and what I thought would be an easy side project turned into a (for me) quite complicated matter. I’m planning to build a mood...
View Article3 channel 10+bit PWM
I am building a controller for RGB LED strip (12V 5m 5050 LED RGB strip with common anode). My current solution uses Arduino Uno with 3x IRFZ44N MOSFETs to power the strip. The solution is partially...
View ArticlePWM Return Problem
A controller send pwm signal with 2 wires 1- PWM 2- PWM Return But servo motor has 1 input pin. So is it correct to use servo supply return (28v Gnd)or servo chassis input for controller pwm return...
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Removing ripples from PWM controlled LED in camera vision application
I have made a camera vision setup with highpower LED’s which are controlled with a simple NE555 timer and a mosfet. The LED system is lighting up an area where a camera is looking, but unfortunately i...
View ArticleCan i use a PWM HHO Controller to control Brushless DC Motor?
Hi im a electronics newbie. The part im talking about is DC 10-50v 12V 24V 48V 3000W 60A amps DC Motor Speed Control PWM HHO Controller here is the link My question is can this type of part be used to...
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lmd18245 dc motor driver
How to build dc motor driver lmd18245t. wanna control dc motor with arduino uno by pwm signal so how make driver circuit using lmd18245t ic and in pic. i made circuit schematic is this correct or any...
View ArticleAvr multiple ADC and PWM channels
I’ve been trying to make a program that would continuously read analog values from 3 different pins and then make a PWM signal corresponding to each of those 3 pins. So basically, 3 output PWM channels...
View Articlepwm and pull up/down [closed]
I am an electrical engineer and feel I should know this, but I for the life of me still cant quite get this concept. I understand conceptually the idea behind a pull up or a pull down, in that we want...
View ArticleWhy is PWM used to control LEDs even when they're only used On or Off?
I’ve noticed on cars with LED tail lights that they have a flicker to them – I presume because they’re PWM controlled. But I’ve seen it on vehicles where brake lights and tail lights are separate...
View ArticleUsing PSMC instead of CCP
Hi I am building a motor controller and I decided to use PSMC instead of CCP to create my PWM, my decision was based on the fact that I dont have enough CCP ports on my pic 16f1788 for the project. I...
View ArticleProblems with using 20Mhz crystal withPIC18f2420
I am using PIC18f2420 to generate PWM. I am using Timer 2 with 4MHZ crystal, which works perfectly by giving me PWM. I need to get 100KHZ of frequency for PWM, for which, 4MHZ crystal is not enough as...
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How to add the two output of a PWM IC?
I need to sum output A and output B of a PWM (UC3526AN) because each output have a maximum duty cycle of 0.45. I try with 2 diode and a limiting resistor(R1) for the led inside the optocoupler (4N25)...
View ArticleMAX PWM of MSP430G2553 or any MC
I am playing with microcontrolers lately, more specifically MSP430G2553 with the LanchPad. I want to output a PWM and also read a PWM. For producing PWM I use a timer that calls an interrupt. For...
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