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What is this SMD component In the driver
What is this SMD component ?It is on the PCB driver for the sofirn from China companies, when inserting a 1.2V battery it does not light up led, when inserting 3.7V everything is ok, the other...
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Identifying pinouts for ADSP-400NWT and/or ADT_NEW2S3C 1/4 CONV V.3.0 duty...
I've recently acquired an old storefront LED sign. It's four 16x16 celled panels, each cell containing a red and green LED. Two boards drive the sign - ADSP-400NWT is the main board that handles...
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Why does contact with the ground make my touch-activated LED brighter?
I have a circuit that looks like the image attached below, where the switch on the left represents my finger touching / not touching the wire. I used 1V to simulate my body's voltage and 100kΩ to...
View ArticleTwo-channel adjustable, mains-powered, 60W LED driver circuit?
BackgroundI made a nice light for my electronics bench using a tunable LED strip and off-the-shelf driver. The strips have interleaved warm and cool LEDs, and is tunable by adjusting how much power is...
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Can we drive an LED from an output port of a TCA6424ARGJR IC?
I am using TCA6424ARGJR IC so from its output port 24 I need to keep an LED, which glows when there is high.Can we drive an LED from an output port of a TCA6424ARGJR IC?I have connected everything as...
View ArticleWhat kind of LEDs are typically used in lights?
Forgive me if "What kind of LED" is technically incorrect. I'm new to electronics and am trying to build a light (reference link attached below) for making videos. I have some LEDs which come standard...
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String of 5 WS2813B LEDs flashing White on power up or reset
I'm using an ESP12 to drive 5 WS2813b RGB LEDs, in the code I use the Fastled library and switch off the LEDS straight away but there's always a white flash of all the LEDs on power-up and reset (the...
View ArticleUsing LED lamps on stage - adjusting brightness
I have some LED lanterns for stage use. They are fairly complex in that they have a flickering candle effect made by having a series of LEDs stuck to a central column (the candle) and a circuit of some...
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Replace 5mm LED with High Power without changing the circuitboard
I would like to know if I can replace the LED on my radar detector remote controller with a high power one without changing the circuit board components.Attached is the board and I'm looking to replace...
View ArticleHow to find the right specification of LED corresponding to an incandescent...
I have a motorcycle and its taillight had an incandescent (filament) bulb. The wiring diagram says it's specification was 18W for 12V supply. Now, I want to use an LED (or several) in its place with...
View ArticleContinued illumination of LED after removing voltage
I am designing high-speed flash for my microscopy project and as I know from my practical experience when you stop applying voltage on the LED it needs some time to fully stop illuminating, because of...
View ArticleHow can I control LED brightness from an MCU without using PWM
I want to turn 4 LEDs off, on, or anywhere in between with an MCU. I do not want to use PWM because I have to avoid flicker on camera.I have a DAC on the MCU that can output between 0 and 2.8V, and a...
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Current driving a 7-segment quad digit display
This is a followup to my question https://arduino.stackexchange.com/questions/98809/difference-between-using-gnd-and-digital-low-for-7-segment-display-pin which should've been asked here as it turns...
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High power pulsed LED
I found this circuit on another thread on this site and I believe it is close to what I need for my own application (Short duration (approx 128 us), low duty cycle (<1%) high power LED pulses)....
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Led strip power supply , consumption and controller
Hello everyone i am really bad at this stuff, i tried reading a few articles but i can't seems to understand anything.So basically i bought the LED strips from aliexpress that came without power supply...
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Adding an indicator LED to see MOSFET ON/OFF state
Quite noobish question, but which is the right way to add an LED to a MOSFET circuit on the PCB, so that the momentary state of MOSFET can be seen by the led?circuit on left is without LED, the other...
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Power supply for 144 LEDs in parallel?
I appreciate any help as I try to figure this lightbox project. I need to wire up to 144 3V (built-in resistor) LEDs from flickering tea lights (normally battery powered).Not sure how many to wire in...
View ArticleDoes LED brightness change with voltage?
When I was young and learning about electricity, a fabulous tool for understanding voltage/current/resistance was an incandescent lightbulb (in my case it was a small 3V bulb). When you doubled the...
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Low power solution for PoE indicator LED (low side switch, high side fuse)
I'm currently designing a PCB including PoE Injection (using the [PD77728][1] IC).I would like to add an indicator LED to indicate there is power on the PoE port.Each port basically has a fuse on the...
View ArticleAWGs for the following LED setup
I'm ass deep in my next project.....4 LED cubes(small lanterns) on the ceiling...The strip is:Power: 0.1-0.4W/LED 6W-24W/m Total: 30W-120W This is a variable valueHave a 12V power with enough AMPS.......
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Dimmable LED drivers: choosing correct power
I am at a crossroads when choosing correct dimmable power supply for my DLS Rena 9.3W LED lights. In my case, I will be using Shelly Wave PRO Dimmer 2PM as a mains phase-cut dimmer, so now I need...
View ArticleHow does series parallel combination of LEDs affect the temperature rise?
I was designing the LED light of 200 W with LED combination of 9 series / 8 parallel, each LED is 6V thus total output voltage is 56V. I am using Meanwell xlg 200 W driver. But this resulted in high...
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Parallel LEDs in semiconductor package
I'm working on a project that requires me to use 3V LEDs with a Lux rating of about 150 lm @ 300 mA. I'm working with my PCB vendor, and they recommended an LED with the specs I'm looking for.However,...
View Article1.5V to light up LED
Need some help here. I need to light up a normal LED with ONLY 1.5V. Yes, 1.5V to light up an LED sounds ridiculous since we need a minimum of about 1.8V or more. But is there any solution?
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Two different 9W LED, with different current [closed]
I am replacing a Sylvania LED9A19 9W light bulb with an Ecosmart Model B7A19A60WUL33 9W lightbulb. I noticed that the labelled current draw for these two 9W lightbulbs are different, although they are...
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Why do the input filter caps (C3/C5) burn out on RCD-48 LED driver?
I’m working on a circuit to drive LEDs using a 24 V input and the Recom RCD-48-1.20 constant current LED driver. The design follows the rcd-48-0.70 datasheet’s suggested Class-B input filter (bulk cap...
View ArticleLED SMPS converter
Which type of converter is best for an LED light for getting better efficiency and high colour rendering index?We want to design a converter up to 80 Watts which gives indirect lighting and less shadow...
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how to select LED protection device?
I have this simple LED configuration:Voltage source is 24VDC so with the 1k resistor and three 2V LED, current is around 20mA.I want to put a PLED device across each LED. how do I select correct part...
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How does this string of LEDs work?
I bought a cheap string of LEDs in the supermarket (the christmas decorationny type) and just out of curiosity I'm trying to figure out how it works, because I can't understand how it doesn't short...
View ArticleHow to make a product with LED dimming capability? [closed]
I'm trying to build a stand-alone lamp with LED dimming.It uses a lithium battery for power and I want to control the brightness in three steps using a touchscreen.I found a circuit that uses a NE555...
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