Questions tagged [dimmer]

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130 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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1answer
87 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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1answer
48 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
59 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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2answers
54 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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2answers
74 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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2answers
111 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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2answers
75 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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1answer
60 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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1answer
50 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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1answer
45 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
79 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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1answer
51 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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0answers
51 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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1answer
81 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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0answers
17 views

Lutron MACL-153 with Shelly 1

To sum up my question, can a digital dimmer switch be controlled with a ESP8266 WiFi switch? I don't fully understand how a digital dimmer works and I doubt that just switching the power through a ...
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1answer
46 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 ...
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4answers
104 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 ...
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3answers
234 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 ...
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0answers
84 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 ...
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1answer
323 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 ...
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0answers
365 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 ...
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0answers
52 views

zero cross detection using linux GPIO in C

I am trying to make an AC dimmer and need zero cross detection using GPIO in C, I am using beagleboard. I have seen others using python on RPi so it should be doable but, it seems that GPIO reading ...
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0answers
33 views

Triac failure and Capacitive Transformerless Power Supply Load

I have done a dimmer using a PIC microcontroller (with a Transformless Power Supply), with BT137 (sensitive gate, four quadrants), firing on QII and QIII, and its load an old fashion Edison style 220V ...
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1answer
87 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
452 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
60 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 ...
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0answers
35 views

COB LED Can't figure maximum voltage

I need to know max voltage parameter of COB, it's video led light Aputure c120d(cob 130w, manufacturer "luminus", unknown model, 6000 Kelvins,CRI96+), i have working driver/dimmer with this light. ...
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1answer
44 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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1answer
80 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 ...
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3answers
111 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 ...
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1answer
62 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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3answers
278 views

1000 W Arduino dimmer

[![enter image description here][2]][2]everybody, I have a project which is to dim 1000 W halogen light connected to Arduino. I used this circuit which is working fine with 100 W halogen light but ...
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1answer
416 views

Triac dimmer makes audible noise (hum or buzz)

I have some triac dimmer from IKEA (bought several years ago). This dimmer makes audible noise (hum or buzz), very notable during night when it is placed on a bedside table. I failed to find the ...
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1answer
79 views

Triac control circuit through load

Why is it that in every triac analog dimming circuit I find that the triac triggering circuit is fed through the load and not straight from the mains??
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4answers
129 views

Phase control universal motor dimmer

I need to control the speed of a 220v universal motor using arduino and I am thinking to use an atteny85 ic with a phase control circuit (ltv814 to detect zero crosses and moc3052 to drive a triac to ...
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1answer
98 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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1answer
60 views

Tripping a circuit breaker when using a half wave rectifier

How does a half wave rectifier or phase control dimmer affect the triggering of a circuit breaker? For example, if a 20A resistive load was on a 15A breaker with a half wave rectifier. Now average RMS ...
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1answer
220 views

Questions regarding eliminating hysteresis in ac dimmer

In the following circuit it says: “This hysteresis effect can be eliminated however, using the circuit from a detailed application note from Littelfuse shown in Fig. 6.4.4. Here the capacitor C1 is ...
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1answer
48 views

Create a polar cap with a diode?

I'm trying to order components, so I can make a board following this circuit. My problem is, I cannot find any 0.1uf capacitors, that are rated at 275VAC. The highest voltage I can find, in stock, is ...
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1answer
338 views

amplifier for 10V LED dimmer control using Raspberry Pi

My problem is I need to have an amplifier circuit design - schematic + components BOM with specific model information that is able to provide a dimmable output signal (Vout) 0.2-10V <0.8A for a set ...
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2answers
623 views

What is the purpose of diode in parallel with the resistor divider in MOSFET gate driving circuit

I have built several 200W AC dimmers using Microchip 8-bit CPU and the illustrated back-to-back MOSFET circuit. I have seen on Internet schematics with the D1 diode in parallel with the R1 resistor, ...
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1answer
61 views

True replacement for MOSFET Infineon SPD04N50C3

I have built many 240V AC dimmers with back-to-back Infineon SPD04N50C3 N-channel MOSFET transistors without any problems. Unfortunately they are not manufactured anymore. I found a replacement from ...
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1answer
280 views

230VAC dimmer MOSFET failure at surge test

Our dimmer prototypes work fine, but fails surge test, as per 61000-4-5, 1/50us. Circuit is isolated dimmer for 230VAC different types of bulbs. It uses 2x N MOSFET as switch. V503 detects zero ...
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2answers
96 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
125 views

How to: Led Dimmer switch to on/off switch

I have a led strip with a wonderful no touch dimmer on the bottom of the kitchen cabinets. What i would like to do is to "link" the inner lighting of the cabinets to the same switch, in a manner that ...
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2answers
189 views

TRIAC and Driver is heating up

I am trying to do a dimmer and below is my schematic. Before doing an actual PCB, I did a proto on a veroboard and the circuit works perfectly. Now when I did a PCB and got it back from the ...
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1answer
1k views

How to choose the right potentiometer for dimming a LED

I have a reading lamp from IKEA. It has a bright LED. Too bright for my taste. So I inspected it and it is composed of a DC power supply unit that outputs 7V and a maximum of 3W. The LED unit is ...
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3answers
786 views

Calculate Angle for Triac Phase Control

Triac-based phase control of the mains power into resistive load. According to this post, https://www.physicsforums.com/threads/how-to-calculate-rms-voltage-from-triac-phase-angle.572668/#post-...
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1answer
114 views

Can I use X9C102 digitally controlled potentiometer on AC voltage?

I am working on a project to make a dimmer using the triac and a photocoupler, and I want to know if I can use a digital potentiometer to regulate the intensity of the light. I know it works for ...