Questions tagged [dimming]

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

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1answer
581 views

Why is this digital potentiometer working?

I've been working on a circuit to dim a Shop Light that according the manufacturer is 0-10V dimmable. Built into the light is an LED power supply that provides two wires, a purple DIM+ and grey DIM-. ...
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5answers
3k views

Incandescent Light Bulb Soft Start

Is there any circuit to make incandescent bulbs (60-100W) light up more gradually? I've seen many different devices but none of them would work for me. I do not want to just stop the high current ...
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1answer
61 views

Light fixture dimming, LED turn of

I'm trying to dim a light fixture with the DALI protocol. It functions quite fine but when the dimming gets low two thirds of the LED:s turn of. Why is this? Is it because the voltage forward gets ...
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2answers
762 views

Dimmable LED lights flashing on full power

This is quite specific but i don't know another site to ask this on. Symptoms: I have a driver that has 3 settings, off, dim and full. The lights turn on and work on dim but on full they flash. ...
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1answer
384 views

IC controlled triac dimmer design, zero crossing detection and inductor sizing [closed]

I'm trying to create a dimmer that uses an IC to control the triac firing. My understanding is that I need a random phase optocoupled triac driver. However I need to know when the zero crossing is on ...
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3answers
425 views

Atmega328p PWM overheating and flickering

I'm trying to build a dimming control for a 24V RGBW-LED strip using potentiometers as analog inputs. It's pretty similar to the analogWrite() example on the arduino website (arduino.cc/en/Reference/...
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3answers
545 views

Hot Mosfet IRL540N with Gate 5v and Source 12v-260 mA [closed]

I've connected the + of a 12v powersupply to a 12v LED-spot. The - of the LED-spot is connected to the source of a IRL540N mosfet. The drain is connect to the - of the 12v power supply and the ground ...
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0answers
41 views

Would increasing regulator rating allow connected components to a system to not cause brownout?

Currently, I have several ICs connected in a circuit to a 6 VDC wall supply through a 7805T voltage regulator. The outputs of the circuit are LEDs and I also have a test point in my circuit in which I ...
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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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0answers
1k views

Resistor value selection for PWM dimming of Meanwell LED driver

I'm controlling a Meanwell LED driver's dimming function using 0-5V PWM from an Arduino, stepped up to the 0-10V PWM the driver expects. Here is the circuit. '0-5v' is the 5V PWM from the ...
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3answers
519 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
848 views

Driving parallel arrays of LEDs from a single constant current supply

I'm looking at using a single constant current, DC-DC boost converter to power several (6 - 8) parallel strings of 3 LEDs, like the drawing below. This is powered by a single li-ion battery. To ...
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1answer
4k views

pwm frequency for led dimming

i am using a meanwell LDD-H driver to drive some led for a reef light. (datasheet http://www.kosmodrom.com.ua/pdf/LDD-H.pdf) standing to datasheet i can use a pwm of 100 ~ 1KHz what's the difference?...
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1answer
65 views

What Wattage does my resistor need to have to be save to dim an LED strobe module?

I want to dim a commercial LED strobe module and can't seem to figure out what wattage the resistor needs to be. Most posts are about single or multiple LEDs with their known forward Voltage etc. like ...
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386 views

How to know if a LED power supply will deal correctly with dimming

I have a led strip with its 24V own power supply (IKEA's Ledberg), and I want to make them dimmable. I've successfully done it with an arduino and a MOSFET, but I'm unsure if the power supply will ...
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2answers
493 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 ...
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2answers
539 views

Smooth and no-flickering dimmable light source

My goal is to record a video with a varying intensity light source. No flickering at any frame rate (frame rate 30 60 120 240) while watching frame by frame, not human eye. Smooth dim level Any type ...
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1answer
234 views

Control USB powered light with PWM, would it work?

A few weeks ago, I asked about controlling a DC powered LED lamp using PWM here, I was told that if I can get a LED lamp that uses an external DC adapter to power up, I can use a MOSFET and control it ...
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1answer
749 views

Triac connected CFL or Incandescent bulb or Electronic ballast tubelight FLASHES

I am building a triac based dimming circuit. Everything is working fine. The problem which I am facing is when I turn on or off any appliance (NOT CONNECTED TO TRIAC) in my any other room, the CFL ...
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2answers
2k views

Zero-Cross detector problem

I am really in a tough situation and need very serious elaborative help with this. Almost like spoon-feeding. It's been days I've been trying to get my zero cross detector (and the triac dimmer) to ...
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3answers
5k views

Dimmable AC LED controlled by Arduino

I am a beginner, and I have a school project that requires me to use Arduino or any other microcontroller to control an LED light. After some research, I found out that not all LEDs support dimming, ...
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3answers
215 views

Adding a dimming knob to a step up power supply

I am a ME student with little EE knowledge, and I currently have a setup which includes a 12V SLA battery, a 100W LED chip and a constant-current constant-voltage step up converter. The board can be ...
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2answers
504 views

Dimming CCFL:s with PWM or amplified analog voltage

First post here. I have been trying to get this project going for a while, but I now think it is time to ask for help. I want to build an array of cold cathode fluorescent lights (CCFL:s). The ...
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1answer
4k views

Using optocoupler with MOSFET for dimming a LED

I have a blue LED which I want to dim using an Arduino, an optocoupler and an N-MOSFET. For achieving this I assembled the circuit on a breadboard as shown in the pictures, using a YwRobot breadboard ...
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1answer
475 views

TRIAC Dimming Modules - 60Hz Module on 50Hz Supply

I live in Ireland, on a 240V/50Hz supply. I run a Wink Hub, and therefore am bound to using US based Z-Wave frequencies, which usually operate on a 120V/60Hz supply. I have an Aeon Labs Dimming ...
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1answer
811 views

12v LED Turn on and Dimming based on either MAP signal, or RPM of Car

I've got a simple 12v Red Led strip installed in my car, and i currently have it hooked upto a relay which turns it on when you unlock it from the key fob (the same as the interior / courtesy lighting)...
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2answers
341 views

Can LED Driver chips drive the LED with continuous ON DIMMING?

I am assigned with the design of a LED driver with 1 A current and 5 V system power. The customer wants to control all the LEDs with simple switches, nothing digital is involved. So I am thinking of ...
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1answer
1k views

Using 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 ...
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1answer
992 views

AC Dimming of FAN making humming noise

I have achieved FAN Dimming using Phase chopping method, here I get smooth dimming on Incandescent Bulbs and I am also able to dim FAN using the same. But during FAN dimming it makes a lot of humming ...
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1answer
128 views

How do I wire LED light based zone for DALI dimming? [closed]

I understand the concept of DALI but I’m having problems understanding how to wire a zone. Let’s say one of the sections of my living room will have 5 x 5W /350mA ...
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1answer
195 views

How is it possible to use TRIAC dimming with an 110v input LED T-8 Tube light?

I have seen T8 or T10 Led Tubes made for entertainment lighting that can plug into a Triac dimmer and be dimmed down to approx 10% with no flicker and no color shift. Attached is a picture of the ...
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1answer
1k views

Altium: How can I dim the layers I'm not currently using?

The routes on all layers are fully bright. I want to dim the ones on the layers not currently used. I don't mean dimming ALL routes (even on the layer I'm currently on) except the one segment I'm ...
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1answer
541 views

fading out effect on a bunch of LEDs [duplicate]

I am trying to make a bunch of LEDs fade out when they are turned off. The task is quite simple for a single LED by using a 1000uF capacitor to produce a time delay as in the following circuit: The ...
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1answer
452 views

Use SCR dimming info to feed 1-10VDC line

Hello I am modifying an electronic lighting fixture to use LED instead. I have everything I need already, 80W LED, Power Supply, etc. There are just two issues I cannot resolve. The original fixture ...
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2answers
237 views

Bi-Directional Rheostat/Potentiometer

is there any known type of device will do the following: [I have read the bi-directional potentiomenters posting LINK but I just joined and can not reply to that posting. I am looking for a rotation ...
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4answers
8k views

Question on Resistors for use with 5050 LED Strips

I bought a set of red and yellow 5050 waterproof LED strips for my motorcycle. I'm looking to add them to my topcase so it has running, brake and directional lights on it. Right now, there are no ...
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1answer
166 views

30x Incandescent light bulb in parallel ? + dimming

I'm trying to connect 30x small incandescent light bulb in parallel (1.5v / 300mA). But I'm having some issue designing the supply and dimming circuit. Does it just work like LED's for the ...
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2answers
824 views

LED glowing when the driver's ground is cut off

I made a simple circuit with a premade LED driver (Recom RCD-24-0.35), analog-dimmed by a MCP4921 DAC, which is controlled by a 3.3V microcontroller board. You can see the schematic below, Q1 is ...
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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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1answer
444 views

Analog/PWM Dimming signal for a LED driver (LIPO battery low-voltage cut-off)

I am using a 4S LIPO-battery and a commercial constant current LED driver to drive a LED setup. Data Sheet for the driver To avoid abusing the LIPO battery, I would like to build a low-battery cut-...
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1answer
603 views

Simple LED Dimming from Analogue Voltage Control

I have a circuit which switches 12V to power a 12V, 20mA LED (Marl 512-997-21, RS: 310-6921). I need to modify this to add some simple dimming control. The current circuit doesn't have any resistors ...
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3answers
845 views

Lamp flickers if dimmed up to an extent

I used circuit shown in this instructable to make an AC dimmer but everything goes fine if not dimmed much but then it starts flickering because of voltage fluctuation. http://www.instructables.com/...
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2answers
7k views

LED lamps with halogen dimmer

I've got halogen spot bulbs, with GU10 connector, throughout my living room. All connected to one halogen dimmer. I'd like to replace them with LED spots, using the same fixtures as the halogen spots. ...
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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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2answers
705 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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1answer
1k views

Dimming power LEDs with Arduino

I used the following circuit to dim power LEDs with Arduino: I used TIP120 or IFR610 as Q1 instead of IRF510 and I found that if I use IRF610 the current is much more lower than expected. In case of ...
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3answers
8k views

Permanently dimming an incandescent light bulb

I have purchased a nice light bulb with long visible wires/resistors and plugged it in, on the ceiling. It burns too bright without a dimmer and does not look as intended (also the lifespan decreases)....
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1answer
840 views

512 channel LED strip controller over RJ45 (TCP or UDP based commands)

How would you make the following? I'm looking for a 512 channel LED strip (varying size) dimmer, controlled over TCP/IP or UDP. My dream board has: 512 individual channels @ 12V Each channel ...
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1answer
525 views

dimming led driver

I know the basics of powering LEDs and am pretty sure I have found a suitable driver for most of them. The LEDs I have are : 4 x White Foreward voltage: 9-11v Foreward current: 900 - 1050 mA 4 x ...
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2answers
3k views

LED accent light that slowly dims when removed from power source

We've all played with different transformers and power supplies that have an LED indicator that dims before going out entirely when the power supply is unplugged. I'm working on designing an accent ...