Questions tagged [dimmer]

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1answer
49 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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2answers
55 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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0answers
38 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 trans and then to the motor) and its IC surface is erased and expunged and I don't know its number. ...
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1answer
65 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 ...
2
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1answer
155 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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4answers
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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0answers
54 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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0answers
55 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 ...
0
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1answer
76 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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1answer
99 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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1answer
59 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 ...
1
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1answer
62 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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1answer
64 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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0answers
80 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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0answers
57 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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1answer
27 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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2answers
262 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 ...
0
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1answer
125 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 ...
0
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1answer
120 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 ...
0
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1answer
129 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 ...
0
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1answer
207 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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0answers
155 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 ...
1
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1answer
261 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 ...
1
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1answer
318 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 ...
1
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1answer
69 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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0answers
65 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+€ ...
2
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2answers
99 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. ...
0
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2answers
376 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 ...
1
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2answers
295 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 ...
2
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2answers
332 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 ...
1
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1answer
88 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, ...
1
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1answer
109 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/...
2
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1answer
147 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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0answers
273 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 (...
0
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1answer
61 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 ...
0
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0answers
61 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/...
1
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1answer
442 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 ...
0
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1answer
100 views

Reverse Phase Dimmer MOSFETs

I have a comprehension question regarding the design of a reverse phase dimmer. I have a picture attached of the part of the circuit I do not understand: The line is connected to the Drain of Q2 and ...
1
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4answers
113 views

Can I prevent a 9V LED flickering when dimmed to around 30%?

I bought an overly bright 9 volt, 3 watt LED to light up a bird box which has a webcam in it. The LED module is this one: https://www.amazon.co.uk/gp/product/B07CWSRF6N However when I dim it using a ...
0
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3answers
652 views

Using very low voltage from dimmer switch to trigger 12 volt supply

I have a new stereo head unit in my car that auto dims when the headlights are on. The head unit does not have a variable dimmer, it is either on or off. I have a dimmer switch in my car that is ...
1
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0answers
104 views

Suppressing the turn off transient for a trailing edge 120V AC dimmer

I am designing an 120V 60 Hz AC trailing edge dimmer based on the reference design above. The gate is driven starting at 0/180 degrees of each cycle and turns off at a programmable phase later in the ...
1
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1answer
805 views

2-channel dimmer from NE555 + LM358?

I have a 12-24 V dimmer for LED strips like this: https://www.circuitlab.com/editor/#?id=c8m48y simulate this circuit – Schematic created using CircuitLab I want to understand a couple of ...
0
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0answers
985 views

AC Dimmer circuit with MOC3021 & EL817 along with ESP8266 (NodeMCU)

Major two issues/question are here: 1) The challenge I am facing is, my interrupt is not working. 2) do I need to include a Heat Sink in this? Hello, I am quite ...
0
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1answer
228 views

how to make a variable light dimmer circuit without potentiometer?

I was looking at the Wemo Dimmer and thought to make one at home myself because the price of it is very much if I buy(including import duty). I searched for the knowledge which helps me create a ...
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4answers
1k views

FL5150 (LED dimmer) circuit explanation

I have been working on an IC from Fairchild semiconductor named FL5150, whose electrical working I have tested by controlling the brightness of a lamp. Until now I have been using the circuit given in ...
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0answers
107 views

Firing Triac strategy for motor phase control

I try to design a replacement potter's wheel motor controller for an old potter wheel. I have solve some problem and I am able to control the phase standard of filament light. Now I try my board on ...
0
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1answer
60 views

Capacitor Shorting in transformer circuit

I built the circuit shown in the link with 240v https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ It did not work (produceing no spark), as I believe my capacitor was ...
1
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2answers
206 views

Current flow in trailing edge dimmer

I was trying to learn something about dimmers for light bulbs. After some reading, I found that most trailing edge dimmers contain some variant of this: Found for example in this diy-project or this ...
1
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3answers
127 views

uC controlled MOSFET based LED Dimmer stops responding

I've designed and implemented LED Dimmer driven by PWM from Adruino Pro Micro (CLONE) with software based on MySensors library. See the schematic attached below. The idea is really simple: uC is ...
1
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1answer
111 views

I want to handle the voltage and current spikes from inductive load of 220V AC ceiling fan

I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.

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