Questions tagged [dimmer]

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53 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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42 views

Want to adapt old dimmer in stove hood to work with LED lights

I have a range hood that came with 4 halogen par20 bulbs. It has a three-position switch for the lights: off, on (full), and on (dim). When I replaced the halogens with LEDs, the dim position caused ...
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1answer
73 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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35 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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44 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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20 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
72 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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3answers
154 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
37 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
25 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
40 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 ...
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1answer
38 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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0answers
36 views

Connecting PWM-Dimmers to drive LED-Strip

I've got a question about how to connect multiple PWM-Dimmer to drive a RGB-LED Strip. I bought three of these Ebay-Article No. 272304972812 and connected them as shown below. Without any schematic ...
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3answers
95 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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0answers
34 views

Halogen 24V/150W light dimmer design

I have 64640 HLX (24V/150W) halogen lamp with 24VAC/300W power source and I want to design a dimmer to control the halgen light. I have two solution in my mind: 1- DC solution : using PWM and power ...
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0answers
66 views

LED Dimmer current source and current sink detection

I'm trying to design an input circuit for a microcontroller that will work with 1-10 V dimmers. There appear to be two standards for dimmers, current source and current sink, and I'm trying to work ...
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1answer
37 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
200 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
235 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
63 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
79 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
79 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
52 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
102 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
42 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
261 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
321 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
55 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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0answers
276 views

Light dimmer circuit using triac gives fluctuating dimming

Light dimming using triac and optocoupler is very common and basic circuit, I have successfully tested the dimming for 1 channel (1 triac, 1 opto-coupler) now I want to add one more light dimmer with ...
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1answer
222 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
85 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
94 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
126 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
600 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
521 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
110 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 ...
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2answers
31 views

LED dimmer/controller: preserve state after loss of power? [closed]

Summary: Are there LED Dimmers that are "always on" and whose settings survive loss of power? Details: I am considering a more or less standard led-strip set (consisting of power transformer/driver,...
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2answers
504 views

Would it damage a tile saw if I used a a dimmer switch on it? [closed]

It's a 10 inch Ridgid wet tile saw from home depot. I have a dimmer light switch, and I was hoping to use it to slow the saw down about half the regular speed. Would doing this damage the motor or ...
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1answer
71 views

Decreasing the surge power of the AC loads

I have a pure sine wave inverter 12v to 220v AC, its continues output power is 600VA and the surge power is 1130VA, I want to running my 200W fridge, but unfortunately my fridge surge power is a bit ...
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1answer
133 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
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1answer
38 views

LED Dimmable 2 of the 8 turn off when others are dim [closed]

So I just had Integrated LED Recessed Retrofit Ceiling Light Fixtures installed on a Lutron Toggler 150-watt Double Pole 3-way White Toggle Indoor Dimmer (rated for LED lights). When the dimmer is ...
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2answers
189 views

how to convert a PWM AC dimmer circuit from normally-closed to a normally-open one?

Hi, As you see in schematic, the circuit is a normally-closed AC dimmer. Therefore when the connection between microcontroller - which produce pwm - and mosfet get halted, the lamp will be always on ...
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1answer
75 views

Why does this dimmer switch have reduced wattage capability for LED / CFL bulbs?

The Lutron "Maestro C•L" dimmer has different wattage ratings depending on the type(s) of bulbs being controlled. Its an electronic dimmer. Specifically, when 100% incandescent or halogen it can ...
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1answer
35 views

Convert a 100-277V dimmer to 1-10V [closed]

I'm trying to use the following dimmer: https://www.smarthome.com/switchlinc-dimmer-insteon-2477dh-remote-control-dimmer-dual-band-high-wattage-white.html with these lights https://www.eledlights....
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1answer
328 views

TRIAC not turning off correctly

I am using this circuit with a BTA16 TRIAC: The load is a 110/12 V transformer. I am getting spikes in the output. Note: CH1 is the secondary of the transformer (load), CH2 is the MOC3021 input. ...
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2answers
559 views

How to dim my dc push button led switch that is too bright?

Attached is a screenshot of my button and the dimmer I found, it’s getting a 12V source. I figured using wiring the pwm dimmer like the one shown will work. Please let me know your suggestions on if ...
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1answer
644 views

Dimmer with zero-crossing circuit and TRIAC

I want to make a dimmer to control a huge power resistance of 700W. For this, I made a circuit that detected when the wave reaches zero (the circuit above the figure) and another that controls the ...
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2answers
97 views

What would I use to regulate raise/lower temperature in an AC 40 watt device's heating element? [closed]

It's for a resin burner--frankincense etc--that doesn't have a temperature regulator so it burns too hot. I don't need to know an actual temperature, just to be able to raise/lower the temp'. Thanks.
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1answer
912 views

COB LED Dimming via Poentiometer?

I want to create a dimmer for high power LED light's i'm building for video work. I'm using CREE CXB3590 chips, which have run at 36V with a forward current of 3.6A. I am powering these through a 150W ...
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1answer
363 views

LED dimmer between current supply and drivers [closed]

I want to build a bathroom mirror frame with integrated LED spot lights. Current comes out of the wall, there are already two on/off switches which control that single outlet. That is why I „believe“ ...