1. H

    Wiring 25 LEDs with a PWM Dimmer

    Not usually one for asking questions in forums, as I'm usually able to find solutions with my own research, however, I've been looking at this over a period of days now, and the deeper I dig, the more confused I'm getting.. I'm a Computer Science student, not electronics, so please go easy on me...
  2. avi9526

    LED driver with minimum duty cycle of 0

    hello I have a practical task to make a simple LED lamp. I was using LDD-1000 for that purpose. But it does have minimal duty cycle of 20% (output is filtered so it's 20% of max. current) . Was looking for an alternative that could provide smooth control of current from 0A to 1A. Kinda lost in...
  3. TheMasterXXXXX

    Issue controlling PWM with thermistor

    I am attempting to use a thermistor to control the PWM of a 555 output. Ideally, I want the duty cycle to be 100% when hot (~90°C) and 0% when not hot (~25°C). I am doing so by placing the thermistor as R2 (RB) in astable mode with a forward biased diode in parallel to R2 (allowing a duty cycle...
  4. -live wire-

    Help controlling multiple nema23 stepper motors with esp32 and motor drivers

    Hi, This probably isn't super complicated but I have to control 3 stepper motors simultaneously with an esp32 for part of a robotic arm. These are the nema 23 stepper motors I am using, they are normal open loop 4 wire stepper motors. These are the motor drivers I am using. One pin tells...
  5. T

    Best method for converting PWM to analog signal?

    I want to make a circuit that will convert a PWM signal to an analog signal. I want the circuit to be able to work on higher frequencies as well though (up to 15 kHz). Would an RC filter be the best method? Any reference design examples for this?
  6. T

    Standard LED PWM Frequency?

    I'm trying to determine a standard PWM frequency output for RGBW controllers. I see a lot of constant current LED chips call out a maximum PWM frequency input between 300 and 500 Hz. 1. I assume this indicates that 300 to 500 Hz is standard? I've seen a 12 Vdc 385 Hz RGBW controller pass FCC...
  7. T

    PWM Buck Regulator Question

    Questions: 1. Why do switching regulator ICs have dedicated PWM inputs pins? 2. Can you use PWM on a low side switch at the output of a constant voltage buck regulator module? For instance Remcom Power's R-78E5.0-1.0. My concern is that dedicated PWM inputs operate differently than using an...
  8. J

    Please somebody tell me what will be output watts of this PWM circuit

    Detailed description and website link are below. Parameter: 1>.Product Name: pWM 4-Wire Fan Temperature Controller 2>.Work Voltage: DC 11V~55V 3>.Work Current: 0.1A(MAX) 4>.Fan Current: 5A(MAX) 5>.PWM Range: 5%~100% or 0% 6>.PWM Frequency: 20KHz/2.5KHz 7>.PWM Signal Amplitude...
  9. StijnC

    Single op amp PWM generator

    Hello, I have to design a single op amp circuit that has only +15v, -15v and GND as input and outputs a symmetrical PWM signal (+V and -V) with adjustable frequency and duty cycle. I have something that works partly but not completely, I can adjust the duty cycle from ±60% to ±100% but af that...
  10. ashokraj

    For a fpga, how can i determine maximum number of pins I can use for pwm ?

    Hi, I come from the background of microcontroller design. I am learning fpga design. Usually in the ucontrollers the total number of pwm is limited as per the vendors. In FPGA how can i determine the maximum number of pwm I can drive from a fpga. For example, currently i am working with...
  11. H

    AC/DC bidirectional battery charger/discharger Firmware/Hardware simulation

    Hi, My project diagram is similar to this idea, Lets say input is 3p 380VAC, 60Hz, Main Transformer MTR runs at 20kHz, DC output should be 50-147 v, charging current 100A. Should have CC and CV mode of operation. I need to implement FW with following facilities, 1. Shunt/ Temperature...
  12. Arduinoob

    MOSFET for boost converter

    I am making a boost converter following this Tutorial but I don't have the exact MOSFET. I have 2 motherboards laying around and they have some MOSFETs on them some of the names are: P3055, K3918,6670AL(datasheet inserted). There are high switching speeds but the datasheets don't have the max...
  13. H

    Controlling DC-Motor from incremental Encoder pulse signals using ATmega88, C code

    I have given the following C-Code to test a 60V DC motor with [gear box ratio 16:1 and incremental encoder to see if the code calculates the speed by reading the Pulse signal as feedback for µcontroller from encoder. The µcontroller is ATmega88A-UA. The encoder RE56-3-1000-TI signals 1000 ppr...
  14. T

    New controller wires for dc motor

    Greetings, I am new to this esteemed forum and require some assistance and advice. I am trying to locate the related V+ and V- on my treadmill board (B102S S07 Shanghai Elect) to hook up on a Signal Freq Gen (XY-KPWM) to run my DC motor. Background: My treadmill console acts faulty...
  15. L

    How to wire up PWM control chip to DC DC boost circuit

    Hello, I need some help connecting an 8 pin current mode PWM controller to my boost converter circuit. Specifically this one. I have used controller IC's with integrated switches to make boost converters before, however, the amount of power I need to run through the circuit requires an external...
  16. HazenAL

    Minimal Parts LED driver

    I want to design a LED driver that is compact and uses mostly SMD components. It will run 1 LED at 700 mA and 3 V, and be user dimmable with a PWM signal (0-100%) as well. Additionally, It will plug into a USB port to run off of 5 V. My question is that which design will yield the least amount...
  17. khuranarahul

    Modify Duty cycle by 20 to 50 times

    Hello I have a pulse wave coming from the photo diode, with T(ON) = 50-60us, and total time period is approx 20ms. Since this is too short a period (T1) to be detectable I want to increase it to 5ms, keeping the total time period same, that means I want to multiply the duty cycle by 20 to 30...
  18. 2

    Strange voltage spikes in MOSFET gate driver

    Hello, I have designed a TL494 half bridge power supply which simulates fine in LTspice but has some problems when soldered on a board and I can not figure out how to fix them. Schematic pictures are attached. 1. If I connect GDT1 and GDT2 as seen in the schematic pictures, the output...
  19. abcmann

    Creating a PWM-signal that works properly

    Hello guys, I am currently working with a mircocontroller for the first time. My goal is to achieve a PWM-signal (1kHz). While trying to generate the signal I encountered the problem that my signal seems to be moving horizontal due to inconsistancy in time up to 100 µs. The goal was to...
  20. H

    Controlling DC Current using PWM, but no pulsed output

    Hi. I'm pretty new to this stuff and theres a good chance something like this already exists but I just don't know the name of it. I have a big power supply capable of supplying a LOT of 12V DC current, and I'm looking for a way to control the output current using a PWM signal, but the output...
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