Questions tagged [dimmer]

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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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1answer
87 views

Flickering 230VAC Halogen dimmer

After using Stackexchange for several years now for solving all my Python, LaTeX, math, electronics, engineering and life questions, I have finally come up with a problem I cannot find an answer to. I ...
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218 views

Trailing edge dimmer to activate relay/contactor

I would like to take the 240V feed from a trailing edge dimmer that is driving LED lamps and use it also to activate a contactor or relay. This would in turn run a 230V fan. (Reason: want to have a ...
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0answers
247 views

What's the difference between a pot labeled SB250K vs B250K?

The mechanical on/off detent of the dimmer on a 120 volt, 100 watt halogen lamp failed (i.e.: lamp always on but would still dim/brighten). The failed pot was labeled SB250K and part of a diac & ...
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420 views

MC34063 boost converter + PWM dimmer unstable output problem

I use NE555 & MC34063 to build a LED driver with dimmer function. The crcuit of NE555 , MC34063 & LED are bridged by a IRF640N NMOSFET. NE555 is responsible for adjusting the brightness and ...
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7k views

arduino + optotriac based ac dimmer blinking severely

I try to build a dimmer with arduino phase control and triac. I followed the schematic from http://www.instructables.com/id/Arduino-controlled-light-dimmer-The-circuit. Now I used the software ...
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43 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
148 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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121 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
58 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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1answer
207 views

Modify 120v lamp dimmer for LED bulb

I have a "stick lamp" that has a pot/twistable dimmer with photocell. It works fine with a 24w Sylvania CFL bulb but won't light this 22w dimmable LED bulb (http://www.ikea.com/us/en/catalog/products/...
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1answer
106 views

Solid State relay trips when load on Input change

I am trying to control a 12V door lock using this solid state relay. In my switchboard, I picked the power from the common power line to power up my SSR at 5V using an adapter, The power line is also ...
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1answer
338 views

Looking for advice how to correctly configure PWM dimming with Mean Well LDH-45A-1050 device

I am looking to use a Mean Well LDH-45A-1050 DC/DC LED driver with a an LED matrix but crucially to use PWM dimming. Already have perfectly working led with this driver, just looking now to figure ...
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149 views

Problem with dual channel back-to-back mosfet AC dimmer

I'm having a problem with a two channel mosfet dimmer that I'm constructing. When I had only one channel (T1_signal and Load_1_Live) populated on the PCB in the schematic below the dimmer works fine. ...
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1answer
76 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
96 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 ...