Questions tagged [dimmer]

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4 answers
254 views

PWM LED strip dimmer induces noise in power supply

I've developed a PWM dimmer to dim 100W of LED strips. As I dim it to low PWM values, the power supply begins to hum. I have tried to use also higher PWM frequencies of up to 30kHz, but the problem ...
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  • 121
0 votes
1 answer
29 views

AC Motor Control circuit not working in Proteus

I am new to 555 Timers, Triacs and Proteus and I need help to fix a circuit I have built. The intended function of the circuit is as follows. Two 555 Timers are used to produce variable duty cycle 0-...
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1 vote
1 answer
110 views

How to dim an LED with a 10 k potentiometer?

I would like to know how to use a 10 k potentiometer with a small LED. Each time I try, the LED won't turn off completely and also it used only 20% of the potentiometer. I would like to be able to ...
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  • 11
1 vote
1 answer
89 views

Dimming a constant current LED after the LED Driver?

I want to get a constant current LED tube. This particular model is made by toggled. And I would like to hijack it and place some sort of a dimming device AFTER the LED driver and before the LED ...
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  • 21
2 votes
2 answers
157 views

Modify LED headlight with buck converter, to make it dimmable

I only know enough in electronics to be dangerous. Is there a way to modify this LED board to make it have a dimmable setting? I was hoping to just remove a resistor and replace it with a variable or ...
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1 vote
2 answers
88 views

Snubber Filter Circuit Not Working Triac Dimmer

Hi I am working on a project using a triac to do phase control dimming of 120V ac powered devices. I recently translated my project from perfboard to SMT using an SMT fabrication service. The project ...
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-3 votes
1 answer
65 views

How are standard consumer LED dimmers built?

What would be a circuit of a shelf consumer LED dimmer that works, let’s say, with a potentiometer? Is it important/more efficient to have the dimmer circuit integrated with the 230V mains to 12V/24V ...
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1 vote
1 answer
30 views

Can I plug directly a 0-10Vdc dimmer current for LED to a SMD4051?

I have a LED dimmer which generates a 0-10 Vdc, can I connect it directly to a SMD4051 such as the Onsemi (on Reichelt) (documentation)? If I understand well, the plexed current must be below the DC ...
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  • 159
1 vote
1 answer
113 views

Can a 12 V LED dimmer be used with a 6 V incandescent load? [closed]

Can a 12 V LED dimmer be used with a 6 V incandescent load? I'd be interested in knowing what factors make such an arrangement suitable or unsuitable. Specific example: I bought a 12 V, 60 W Dimmer ...
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1 vote
1 answer
85 views

AC PWM Dimmer with Arduino, but the light is on even when Arduino is off

I'm trying to build an AC dimmer using Arduino Uno microcontroller. I tested a few options and came up with the circuit below which works perfectly fine: The only problem with this circuit is the ...
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  • 13
2 votes
1 answer
73 views

relays 5V 10A and 12V 30V stop working after a few days of use

We built a system for heating 3 bioelectrochemical reactors, but after a certain time of operation the system starts to heat up. We identified that when this occurs, the relay works despite the light ...
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0 votes
1 answer
51 views

Phase cut dimming driver for panel lights having occasional flick

I am designing a phase-cut dimming driver for Incandescent bulbs as well as LED panel lights with dimmable drivers. Using a BTA24 Triac and VOT8121AB Optocoupler driven by my MCU. For zero-cross ...
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0 votes
0 answers
94 views

How to protect potentiometer in adjustable soldering iron?

I have an adjustable soldering iron and noticed that recently at some position of the adjustment potentiometer (R3 in the schematic below, this is the potentiometer ...
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  • 651
1 vote
1 answer
61 views

4x 12V LED strips in parallel with dimmers on 8xAA batteries?

I've built a play kitchen for my kids and would like to make the stove and oven light up. It's been a long time since I've done electronic tinkering so wanted to check I've done my homework right. The ...
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  • 113
0 votes
2 answers
116 views

Fan humming sound when decreasing speed with a dimmer [closed]

I am using a ~large 400mm wall mounted metalic fan (specs below). I wanted to decrease the speed (and noise) with light dimmers (I tried 2 models so far) but when speed is decreased it makes humming ...
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  • 111
0 votes
0 answers
50 views

What is this IC for motor driver?

I have a 220 V motor driver and I think it is a dimmer from its bt138 TRIAC (it goes to a 220-24 transformer and then to the motor) and its IC surface is erased and expunged and I don't know its ...
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  • 19
2 votes
1 answer
119 views

TRIAC phase angle control 120 VAC line ripple

I'm working on a phase angle controlled TRIAC dimming circuit (schematic attached below), and I'm seeing a lot of ripple/noise on the 120 VAC input as I near 50% power. I'm wondering what I can do in ...
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2 votes
1 answer
731 views

Arduino PWM LED lights dimmer using MOSFET - Rise time problem

I’ve made a simple PWM dimmer for LED lights (50W) using IRLZ44N MOSFET and Arduino Uno. PWM frequency is 490 Hz. The Arduino is programmed in a way that dimming tries to mimic daylight using ...
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  • 21
11 votes
4 answers
1k views

Night light broke after trying to dim LEDs

I purchased a cheap night light that plugs directly into a 240V wall outlet. It has three color changing LEDs. The problem was, those LEDs were way too bright. I decided to modify that night light a ...
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  • 905
0 votes
0 answers
82 views

Circuit design to dimmer a 15W led with ESP32

I'm new here! I'm designing an electronic circuit to control a led light (switch on/off and dimmer) in my room with homekit integration (iOS home). So first of all I don't want to spend a lot of money ...
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1 vote
0 answers
184 views

Operate and speed control a 230V 50Hz AC Ceiling Fan with Power MOSFET based Dimmer Circuit

I am trying to control the speed of ceiling fan at my home using a power MOSFET based dimmer circuit. The ceiling fan operates at 230V AC and can consume maximum 50 to 75 Watts power. The circuit ...
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0 votes
1 answer
87 views

Convert 24VAC SCR Dimmed to LED

Hello I have been working on this for many months, many parts, circuits, etc. I dont know if its even possible. I have a 24V A/C source lighting fixture that uses two SCRs in anti-parallel for dimming....
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  • 123
0 votes
1 answer
274 views

why capacitor with triac?

Could someone please explain why there is a capacitor (C3 10nF 400V) parallel with main terminal pins of the triac (VS2 BT136)? Please see the schematic photo. This is a soft start circuit for AC ...
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-1 votes
1 answer
74 views

Use household power strip for 12V/24V power

I have a 12V/24V dimmer (rated 60W) and need to hook up 8 different lights, can I just use a regular power strip to distribute the 12V/24V? the power strip of course says 230V on it, but does it ...
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1 vote
1 answer
122 views

Problems with low-side MOSFET in 12V LED dimming switch

I'm pretty new to electrics/electronics. I'm sorry if I make dumb questions, and thank you for your time. I wanted to control my LED strip shipped from Ebay, which works well with 12V 2A DC adapter. ...
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  • 15
0 votes
1 answer
67 views

Can I connect a wall switch to DC?

simulate this circuit – Schematic created using CircuitLab I am making an air blower with a Kingwin RL4B-B1402512H fan. Can I use the wall switch, and if so, can I use the dimmer as well?
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1 vote
0 answers
164 views

IGBT trailing edge dimmer: the LED bulb only lights up around 40%, strange wave form before that, please advise what is causing that

I built a trailing edge dimmer with IGBT, and I am driving it using Raspberry Pi 3. The circuit mostly works, but I noticed some strange behavior, that I can't put my finger on. Please could you help ...
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1 vote
0 answers
69 views

Adjusting voltage to non-dimmable LED lamps

Some commercially available LED lamps are considered non-dimmable. Traditional phase-control dimmers don't work well with them. Would the behavior of such lamps be different if a full sine wave AC ...
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0 votes
1 answer
28 views

Two dimmers controlling LED strips and blinkig at certain levels

I have two LED strips powered via two dimmers, like so: Certain combinations of dimming on both dimmers lead to the LED strips blinking. The level of blinking is not deep, maybe 15-20% of brightness, ...
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  • 423
0 votes
2 answers
606 views

Debugging burned out TRIAC for vacuum cleaner motor speed control (inductive load)

I have tried to use speed control for vacuum cleaner like below (2000W): I have tried this circuit with two different control methods for the TRIAC (BTA24 -24A): Arduino base by MOC3063 DIAC for ...
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0 votes
1 answer
245 views

Modifying a sliding foot dimmer KFD-527G for LED bulbs

I replaced the incandescent bulbs of a living room floor lamp with LEDs. This lamp was equipped with a sliding foot dimmer but since then, even when I put it on the minimum position, the LEDs do not ...
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1 vote
1 answer
198 views

FL5150 Multi channel dimmer

I'm looking to design a four channel dimmer using the On Semi FL5150/FL5160 dimmer chip. This will be controlled by a digital signal sent over an isolated I2C interface, with my initial design using ...
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0 votes
1 answer
182 views

230V AC triac dimmer for single phase motor and LED lightbulbs

I successfully developed produced my first AC Triac dimmer board, which works fine on resistive load like regular light bulbs. It also works fine for an AC motor the last 2 years. However, in order to ...
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  • 21
1 vote
1 answer
474 views

Christmas LED dimming circuit with potentiometer

I need help. I would like to dim LEDS of a Christmas tree with a potentiometer. Here is my electric diagram. (Please note I'm a beginner in electronics.) I don't know how to choose a good value for ...
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  • 31
0 votes
0 answers
487 views

Perfect AC sinusoidal wave dimmer with PWM from micro-controller

I am designing a circuit for controlling speed of a AC fan using Arduino UNO, this is how the circuit looks like . In this circuit the waveform generated for load is not perfectly sinusoidal,what i ...
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1 vote
1 answer
332 views

How can I fix this LED dimmer circuit?

simulate this circuit – Schematic created using CircuitLab The circuit reverse-engineered above is a LED dimmer which is driven by 555 timer in astable mode which then drives an op-amp to ...
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1 vote
1 answer
583 views

Why are capacitors needed in dimmer circuits?

In a circuit like the one below, why is capacitor C1 needed? I mean I can make do with just a resistor and pot to attenuate the voltage to some level suitable for switching. What does using capacitors ...
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1 vote
1 answer
119 views

Can a feed wire also be used as a relay trigger?

Can I use a low voltage wire (10.5 V) as a supply AND trigger With a single pole double throw relay? Is there a solid state option available? I need a way to switch power back and fourth to LED lights ...
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  • 11
1 vote
0 answers
67 views

LED spot circuit sanity check

I, an inexperienced but curious and willing person, would like to have 4 LED spots managed together by 1 driver and a smart dimmer, but I would like to check if my plan is sound before turning $100+€ ...
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  • 113
2 votes
2 answers
152 views

How does this off-dim-bright lamp three-position rotary switch work?

I have this UBERHAUS floor lamp, with a single-filament, two-terminal bulb. They have a rotary switch in the tube (stem) that turns clockwise to three positions: off -> dim -> bright -> off. ...
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  • 123
1 vote
2 answers
726 views

Could I use the foot pedal of an electric sewing machine to control the speed of rotary tools? [closed]

I am searching for a solution for powering power tools with lower noise levels. I live in an apartment and have many neighbors around me. When I have little projects, I don't want to disturb my ...
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2 votes
2 answers
558 views

How can I regulate brightness of a LED strip with a potentiometer

I have a 12V, 5m long LED strip and an adapter (12V 1A). I want to control the brightness of the LED strip with a potentiometer, I found a simple circuit that involves only a pot and IRFZ44N ...
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2 votes
2 answers
574 views

RC Snubber connection

I'm going to use this AC Dimmer Module with an inductive load, so I plan to help it by adding an RC Snubber Module. Most of the schemes show that the best way to use an RC snubber is to connect it ...
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  • 55
1 vote
1 answer
106 views

Can you dim already dimmed LED lights

Ive installed LED downlights in my room, these : https://www.screwfix.com/p/lap-fixed-led-downlight-contractor-pack-white-370lm-5w-220-240v-10-pack/728fj they are controller via a smart dimmer switch, ...
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  • 13
1 vote
1 answer
150 views

Will adding a resistive load to a lighting circuit stop my electronic dimmer from leaking current to my LEDs?

I changed my bedroom lights yesterday for 220V 7W dimmable LED lights. My bedroom dimmer is an electronic type (LightwaveRF). In the pitch black, last night, I could see the lights faintly glowing/...
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  • 191
2 votes
1 answer
215 views

Arduino based triac dimmer bulb flicker fix on touching Arduino ground

I've designed a triac based dimmer circuit. It is working just fine except the bulb is flickering on dimming (working fine with full brightness). Bulb I am using is filament based and dims perfectly ...
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  • 143
0 votes
0 answers
450 views

4000W Dimmer Eagle PCB Design

I am trying to learn how to design PCBs, and for that purpose I am copying the simplest PCB I could found, a 4000W Dimmer: The Squematic is this: It has the next components: 1 TRIAC BTA416008 (...
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  • 525
0 votes
1 answer
70 views

Simple dimmer for led light

I am looking for a simple mini rotating dimmer I can buy for a 5v to 8v circuit. Can I just connect a potentiometer to the LED and make it work? Is for 16 parallel 1 watts LEDs powered by 4 AA battery ...
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  • 9
0 votes
0 answers
63 views

How to determine LED dimming method

I'm just starting to get my feet wet with electronics so please pardon my ignorance. I bought an LED light-bar to mount to my mountain-bike for some night riding: https://www.korrlighting.com.au/...
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  • 1
2 votes
1 answer
734 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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