Questions tagged [dimming]

'dimming' is the action of reducing the amount of light emitted from a device.

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2answers
55 views

Adjustable current source 0-20mA for LED dimming

I have been searching through the site, but I have not been able find an answer. I have an LED (rated for 14 mA at 24V, the LED is with built-in series resistor) that I need to be able to dim from ...
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2answers
60 views

Need help on building a passive Dim-to-Warm LED array

I have started a project for my home lighting, I'm trying to build a DC LED module which would change the color temperature from 3000K to 1800K as dimmed with reducing current. I'd like to do it ...
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0answers
46 views

Need help in zero cross circuit by using op-amp

I worked on zero crossing circuit by using opto-coupler.Circuit is It is working okay.Zero_crossing signal is There is a 2-3 ms of signal loss is happening with 50Hz of AC signal.I don't want more ...
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1answer
58 views

Need help understanding the mosfet trailing edge Dimming

I am working on a circuit to control AC loads up-to 1.5KW by using Mosfets(FCHD125N65S3R0-F155) Circuit is I have few concerns The current is flowing through the body diode of Q2 for positive half ...
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1answer
68 views

How can I dim 50 high-power LEDs in series with an Arduino?

What I'm trying to do is to use an Arduino to control the brightness of two series of 50 high-power LEDs independently. Each series has an independent LED driver, and each LED has a foward voltage ...
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1answer
43 views

Motion triggered battery powered dimmable COB LED light

My view on life, in any field, is not to produce more but to consume less. Everybody told me this is a very eccentric weird mentality. Perhaps they are right. Nevertheless I have to build my project ...
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1answer
36 views

Limiting the Current of a Constant Current LED Driver which is Driving a Halogen Bulb

I am powering a 12V, 35W halogen bulb with a MeanWell HLG-100H-20B constant current power supply. The "B" version of this power supply has a really neat dimming control system which lets one control ...
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1answer
29 views

Dim a 110 Light using 5v PWM with no ZC

I was wondering if anyone has any ideas of a way I could Dim a 110v Halogen light with the use of 5V PWM, or with 0-24v control. My controller, has the basic (designed) 0-24v control. It also has ...
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1answer
40 views

fan speed regulation causes other loads flickkering

I am using traic based dimmer circuit for regulating my ceiling fan. when the fan is regulated to low speed the other loads(incandescent,tube light,LED) in the room are flickering. when i increase the ...
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1answer
172 views

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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9answers
4k views

Cheap and safe way to dim 100+ 60W Incandescent bulbs

For my wedding reception, we are building ~25 lighting fixtures with 4 bulbs each (fixture per table for dinner). For aesthetic and budget reasons, these are 60w "Edison-style" bulbs which we want to ...
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0answers
81 views

RFI filter modeling in LTspice w/ triac

I have a few questions about modeling an RFI filter in LTspice with a triac-based dimmer circuit. I'm referencing the circuit described in Figure 11 in Triac Principles and Circuits -- Part 2 (Nuts &...
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88 views

0-10V dimming down issue on control circuit stops

I am facing one issue in the interfacing between 0-10V control and LED driver. Circuit configuration: Attached is the circuit flow/interface . 0-10V is generated through PWM interface mentioned in ...
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1answer
563 views

MeanWell 3-in-1 dimming

I've got a constant current MeanWell LED driver that has 3-in-1 dimming (100k potentiometer, 0-10V signal or 10V PWM), and would like to control the dimming with a microcontroller. I found a few ...
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0answers
59 views

LED Driver, Turning ON/OFF consistently

I am building an array of LEDs that I plan to power up with an LED driver. Here is the one I chose - Mean Well LCM-60U I have been using it and it works great. However, I have one thing I am trying ...
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3answers
153 views

Dim LED lamp with constant current power supply using resistors

I own a really bright led lamp that I want to dim. It is powered by a constant current power supply that can supply 37mA between 11V to 17V. If my lamp is connected the voltage settles at 13.58V. ...
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3answers
1k views

Glitch in AC sine wave interfering with phase cut dimming

My company installs ZigBee-based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly ...
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1answer
91 views

How much battery power for LED and how to make it flicker [closed]

I am trying to figure out what configuration of battery(ies) I need to power this LED. I am only using one (specifically the warm white 1-up). I am also looking to make it flicker like a candle with ...
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1answer
66 views

Lamp is dim for ages when turning on straight after turning off [closed]

My bedside table lamp is plugged into a powerboard and is using a 9.5W Mirabella LED bulb on a 240V circuit - in Australia, i.e. with the Australian plugs. We can't buy incandescents here as they are ...
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1answer
114 views

LED dimming circuit

I have a MeanWell IDLV-65A-12 LED driver that I would like to control brightness via the 0-10 VDC dimming circuit. Spec sheet here. I have a basic understanding of electrical circuits, and ...
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3answers
49 views

Can a Current Limiter Power Thermistor be used in line to reduce the brightness of a 120v incandescent bulb?

I have an application were I do not have the room for a dimmer switch but need to reduce the lumens of a 120v 25w incandescent bulb just a bit. There used to be a product called the Bulb Saver Button ...
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1answer
94 views

The 7-segment LED display is too dark when connect to a auto dimming circuit

I'm using the below circuit to build a auto dimming circuit. I was fine when I only use one 7-segment led, but when I connect more 7-segment led (parallel to L1) the light intensity is very low. How ...
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1answer
200 views

Help for voltage is being passed trough load, even triac is OFF condition

We are using below circuit for home automation. We are facing problem when 5v battery is not passing to the circuit,but even 1 volt is being passed trough load, even triac is OFF condition.. Please ...
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2answers
81 views

How much power is dissipated as heat in a 12V MR16 Led Bulb

I just installed a dimmer for a set of (non-dimmable) MR16 bulbs wired in parallel. The dimmer sits between a 12V power supply and the bulbs. My observation when trying to dim the non-dimmable bulbs ...
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2answers
90 views

Combining a light therapy LED lamp with a light alarm clock - programmable dimmer

I live in a place where there is little daylight in winter, so I would like to use a light therapy lamp. Also, I would like to use it to wake me up, gradually increasing the intensity of the light ...
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1answer
169 views

Controlling the brightness of LED panel via GPIO pins

I'm trying to control an LED panel like the one in this link. I notice it comes with an LED driver. But what I'm wanting to do is to be able to control the brightness of this light through the GPIO ...
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1answer
23 views

Dimming LED with speed controller

I'm trying to controll 4 parallel 12V DC LED strips with an speedcontroller. I am able to dim the lights from 100% lit to about 5% lit, but it never turns them off completely. My multimeter can't ...
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3answers
377 views

How to stop LEDs from dimming in small circuit

I wired up a simple circuit (below) which was designed using the "Every Circuit" website/app. It's a small LED circuit used inside a costume prop. When the master switch is pressed, the 3 LEDs light ...
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3answers
180 views

How to improve an elegant design for an LED dimmer, low-powered with LDO

I am building a sunrise alarm clock. The LED is supposed to get brighter over the course of 30 minutes, then remain fully lit for another 30 minutes, then switch off. I am using a digital pin on an ...
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3answers
2k views

Does a dimmed LED lamp draw less power than one at full brightness? [closed]

Does a dimmable 6W LED lamp, dimmed to 50%, draw c. 3W? Or does it still draw the full 6W?
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2answers
461 views

How to increase the dimming range of mosfet controlled LED

I'm slowly getting into circuits and I've put together a PWM LED dimmer. The led is driven by this circuit: I'm driving the PWM via a separate BLE device which maps a user input of [0, 100] to an 8 ...
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1answer
1k views

Constant Current Led Driver (non dimmable) to work with PWM

I have 18W lamps that came with non dimmable led drivers. Ive found datasheet for the main chip (ws3441), which included schematics: and internal block scheme of the chip: I'd like to add dimming ...
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1answer
3k views

Can a MOSFET be used for dimming instead of switching a LED?

I have a simple circuit that uses a MOSFET to switch on and off a ~100W LED spotlight (30V, 3A). It works for this application. I have been asked to modify the circuit so that the LED can be dimmed ...
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1answer
183 views

LED driver type detection- 0-10V or DALI

I am looking for the solution which can automatically detect the driver type installed in street light luminary. There are control mechanism which controls and provides the 0-10V and DALI dimming to ...
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1answer
310 views

Zero-crossing signal inconsistent timing

I have an ESP-07 with NodeMCU firmware connected to a dimming module with a zero-crossing pin. The current frequency should be 50Hz, which means that the time between two zero crossing should be 10ms,...
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1answer
594 views

RobotDyn dimmer controlled by ESP 07 only results in flickers

I use a dimmer module connected to an ESP07 which has Node MCU firmware. I'm using the Z-C interrupt to skip sinusoidal pulses, however I only obtain flickering instead of dimming. The light is bulb ...
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1answer
488 views

Defining contrast ratio and dimming ratio in a LED driver

I read in this article which analyze the contrast ratio achievable with switched mode LED driver system, that is defined as \$ \frac{1}{t_{on}} : 1 \$. Intuitively I can get that the minimum time ...
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2answers
353 views

Dimming LED based on 12v signal

I've got an LM358 comparator turning on an LED. What I'd like to add is a way to dim the LED by a fixed amound when a 12v signal is sensed. It's in a tach circuit in a car, and when the headlights ...
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2answers
3k views

How may I select a smoothing capacitor to mitigate LED flicker without the use of a scope?

I recently replaced a set of incandescent bulbs from the interior of my old car with some very inexpensive festoon LEDs. Unfortunately the LEDs are not 100% compatible with the lighting system as ...
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1answer
1k views

COB LED Dimming via Poentiometer?

I want to create a dimmer for high power LED light's i'm building for video work. I'm using CREE CXB3590 chips, which have run at 36V with a forward current of 3.6A. I am powering these through a 150W ...
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1answer
795 views

Backlight dimming Innolux at065tn14 with vs-ty2662-v1 (PCB800099) LCD driver board

I would like to dim an Innolux at065tn14 LCD backlight via an PWM signal generated by an arduino pro mini. The driver board has an pt4103 Step-Up Converter to drive the backlight of the LCD display. I'...
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2answers
91 views

Dimmer buzzing, lights flickering [closed]

Got an issue with my lights and a dimmer. I got a room with 4 lights in it (6W LED panel lights) and a 60-600W dimmer. Somewhy, the lights from time to time flicker and the dimmer is buzzing all the ...
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1answer
86 views

Driving/dimming/strobing 30 pieces of Cree XR-E individually via Rispberry Pi 3, powered by 18v 4.0mAh makita accu

I am looking for a solution to individually dim (or if not possible switch) 30 Cree XR-E LEDs driven by a 18v 4.0Ah Makita battery and a step-down converter to go from 18v to 3,5v capable of handling ...
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0answers
151 views

PWM dimming with ZCD generates humming noise from fan at low speeds

I have created a circuit which implements PWM dimming using phase cutting with Zero cross detection which works well on incandescent bulbs but creates humming noise when connected to a fan. I am using ...
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1answer
320 views

Triac misfires because of noise from inductive loads

The product is a wifi enabled smart switching device. One device has 4 different channel for four different appliances to be connected to the product. Each channel has a pair of optocoupler and triac ...
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2answers
676 views

High frequency p-channel mosfet pwm dimmer problem

The circuit below is the final one, after all the advice from Mishyoshi and especially Andy aka. It includes Zener diode protection against over-voltage between gate and source on the Mos-fets and ...
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1answer
687 views

Arduino To Control Light Intensity

So I want to build a circuit that can control the intensity of a light bulb (powered by 220V AC, 60 Hz) through the output voltage of Arduino. I know I must use Triac but the question is, is the ...
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1answer
56 views

LED dimming and modulating with two PWM signals

I have a need for an LED, driven by a constant current source, that can be smoothly dimmed and also semi-rapidly (say 2.5kHz) modulated for later bandpass filtering. I've designed a possible circuit, ...
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0answers
439 views

Best circuit for Zero Cross Detection

I am trying to build an optimal circuit for Zero cross detection for PWM dimming using a microcontroller. I have gone through most of forums and their implementation varies. I understand that the ...
0
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1answer
86 views

4-position touch dimmer - waveforms unexpected, but functional. need suggestions for soft switching

I have a 4-position touch dimmer that is fed with 120VAC line voltage and outputs one of four 120VAC waveforms. The output waveform is input to an electronic transformer labeled to permit "dimmed ...