Questions tagged [dimming]

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

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90 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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1answer
1k views

FAN NOISE issue in triac phase angle dimming

I have successfully dimmed a light bulb using a triac & phase chopping method,but when I tried dimming an inductive load (for e.g. ceiling fan) then it made a humming noise at DIMMING, however it ...
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2answers
260 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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1answer
283 views

DALI DAPC OFF command

We are working on DALI LED control gear type product. We are using TPS92515 as LED driver and its controlled through Iadj pin (analog dimming). Our issue is even if we give input zero (GND) to control ...
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1answer
704 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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2answers
467 views

Connecting two LED stripts with individual power sources to one MOSFET

I have two LED strips (IKEA's Ledberg white), each with their own 24V power supply and I want to make them dimmable with an Arduino. I was wondering if it is safe to connect both of them (their ...
1
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0answers
48 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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0answers
407 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 ...
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3answers
505 views

How to build a light sensor for PWM dimmed light (for comparison against CC dimmed light)?

I am working on a project in which I need to find a PWM duty cycle to dim an LED to the same brightness level as an LED being dimmed with CCR. Initially, I was considering using a camera for this: I ...
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3answers
83 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
70 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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0answers
57 views

Combined a 555 dimming circuit with a 555 blinking circuit into a 556, LED flickers during dimming

As the title says, I have put together 2 555 circuits (dimming and blinking) into an NE556. I added a switch to toggle between blinking and dimming and used it to drive an LED. However, I noticed ...
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1answer
10k views

Using two Mosfets for AC

Im having trouble getting my head around using two mosfets to pass AC. I have reduced my schematic to its bare bones to help keep it un-cluttered. The aim of this circuit is to use PWM to dim a bulb ...
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2answers
79 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
65 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
76 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
43 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
35 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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0answers
181 views

Light dimmer circuit using triac gives fluctuating dimming

Light dimming using triac and optocoupler is very common and basic circuit, I have successfully tested the dimming for 1 channel (1 triac, 1 opto-coupler) now I want to add one more light dimmer with ...
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0answers
45 views

0-10v Lighting Control Test Rig for Lighting Control Systems - How to source 10vdc at 2mA?

If this has been asked previously, I have not yet found it. I've never posted here, so please accept my apologies in advance if this post isn't appropriately written. I'm building a test rig for ...
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1answer
86 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
688 views

dimming an Ikea Jansö with Arduino

I have a bunch of LED Lamps from a yellow swedish furniture market. At that time they are connected with wireless power switches (Based on 433MHz). That is quite nice because I can control them from ...
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2answers
64 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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1answer
103 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
766 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 ...
0
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1answer
20 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 ...
3
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2answers
3k views

PWM LED dimming via constant current source

I have this idea to dim LEDs and I'd like to get some opinions if it's feasible. Q1 and M1 form a constant current source, Q1 ensures a 0.7V drop across R2 by pulling M1 gate to ground. Q2 gets a PWM ...
4
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3answers
181 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 ...
11
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4answers
36k views

Digital Dimmer With Microcontroller

I want to build a digital dimmer for resistive Loads. I have found this circuit for that: The input voltage is 220VAC 50Hz. The red box in the picture is for ...
3
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5answers
6k views

LED matrix dimming: How to control the current in a 12V LED lamp for video lighting?

I'm trying to dim a 12V LED lamp (LEDs specification here however schematics have the real values...) I've build for a video lighting application. My initial thought was to use a potentiometer but it ...
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3answers
144 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 ...
6
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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?
0
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2answers
349 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 ...
0
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1answer
271 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
1k 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 ...
1
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1answer
131 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 ...
0
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1answer
389 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 ...
2
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1answer
619 views

Need help controlling a relay using a dimming light

TL; DR: Trying to control a relay using a dimming light. When the light is fading on and off, it causes the relay to switch on and off very quickly. Hi all, I am trying to control a relay with the ...
0
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1answer
342 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
2k 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 ...
0
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1answer
540 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'...
0
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2answers
86 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 ...
0
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1answer
78 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 ...
0
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0answers
124 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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2answers
533 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 ...
1
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1answer
277 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 ...
2
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1answer
592 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 ...
0
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1answer
49 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, ...
0
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1answer
75 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 ...