Questions tagged [dimming]

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

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Dimming USB Led Lamp

Currently I have a project that consist in the following: We have 2 USB Led lamps. (e.g 13 leds, 5V, ~200mA) To these lamps, we would like to control the intensity of the light, through a Raspberry ...
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2answers
396 views

Does a phase-controlled dimming degrade the lifetime of filament or heater element?

In numerous sources I've heard that it's "easier" for a heater if you don't switch fast current transients on it. How come? Why does the wire degrade?
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3answers
2k views

Switching / dimming a high power mains heater

I need to make an adjustable power controller for a 3kW heater that will run off single-phase 240V AC power. How should it be done? Maybe a triac circuit similar to that used for dimming lights. ...
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1answer
3k views

How to design a snubber for optotriac

I've seen in several places this snubber circuit composed of 2.4K and C1 in this particular case. My question is - what's the purpose of this network exactly and how are the values for the resistor ...
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3answers
2k views

Could a lamp plugged into an outlet be dimmed using a variable resistor?

If you had a variable resistor connected between a lamp and the wall, could it be dimmed with a variable resistor? Would it be practical, i.e. would it waste much energy? And would it affect both ...
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1answer
178 views

Dimmable projector bulb

Is it possible to dim a mercury vapor short arc bulb?
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2answers
22k views

Do dimmer switches work properly with any kind of lamp? [closed]

I have a dimmer switch installed in my room that I like very much, but lately incandescent lamps became harder to find, and soon (in a few years or so, if I'm not mistaken) they will be gone to be ...
5
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3answers
10k views

How to dim an LED with constant current supply?

I have a power RGB led with 350 mA max per color. If I get 3x 300-350 mA constant power supplies will I be able to dim each individual color from 0 to 100% power with Arduino (with NPN transistors)? ...
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2answers
468 views

Power source for 12V PWM controlled light

I'd like to build a PWM-controlled light circuit. Since I'm not an electrician, I want to avoid working with 230 V as much as possible. I imagined an Arduino (fPWM = 460 Hz) controlling a MOSFET which ...
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1answer
331 views

dimming leds and switches

Is there a way to dim LEDs? The idea is to run them in my car and have a dimming switch somewhere but I cannot find a suitable dimming switch and was hoping some one could recommend other methods of ...
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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 ...
10
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4answers
17k views

TRIAC dimmer, circuit design help (resistive load)

Okay guys, I've been tasked with making a light-dimming control system for a 240V heat lamp dissipating around 250W. I need to adjust the heat output on the lamp by control from a microprocessor. I'm ...
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2answers
8k views

1-10V fluorescent lighting digital control

I have a number of fluorescent lights installed that use 1-10V dimming. Note that this is not the same as 0-10V dimming as used in older theatre equipment. The control gear for the lights outputs 10V ...
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1answer
742 views

Can I use an ELV dimmer to dim an electronic switching power supply for LEDs

I am using a Meanwell 350-12 power supply to power LED light strips which use SMD 5050 diodes. It is an electronic switching power supply. The strips use PWM normally to accomplish dimming. In this ...
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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 ...
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3answers
12k views

Trouble with triac driven dimmer circuit

I have a dimmer circuit that produces the following wave forms. Red: Triac Gate Signal Yellow: 120v 60Hz AC Wave (not triac output) I would assume that given this signal, the triac should flip on ...
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6answers
16k views

Arduino Home Light Dimming

The drywall is just starting to go up in my family’s basement project. I’ve been looking into residential light control systems. Some of the ones I’ve seen have been an upwards of $2,000. I’m thinking ...
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1answer
4k views

How to connect a light dimmer for my lamp

I have a light dimmer i want to connect to a a floor lamp. I have tried to look for some diagrams but haven't been able to find some. There is a diagram on the dimmer but I don't understand it. I ...
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2answers
43k views

How are LED Christmas Lights Wired?

I'm planning on building some dimmable lighting controller for Christmas lights, but with LEDs being all the rage nowadays, I was thinking that instead of using triacs and dimming at 60/120 Hz, ...