Questions tagged [led]
An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.
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Why is a dummy starter for a LED fluorescent tube resistive?
I bought some dummy starters that are used to replace the original starter in a fluorescent light fitting when a LED replacement tube is fitted. I broke one starter open, and it appears to have a fuse ...
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Connecting 2 COB in parallel [duplicate]
I have 2 COB chips rated upto 400ma at 36v connected in parallel with a 600ma constant current driver (54v max)
On testing both led worked fine but had minor difference in lumens at some levels as I ...
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How reliable using this LED under its rated specs?
I want to control the built in LED of this switch by an MCU GPIO pin which 3.3V. The datasheet of the switch is given here.
Since there is almost no detail but the "Voltage & Rating: 12V @ ...
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IR optical receiver system circuit
I'm trying to build a device to measure the obscuration of an IR signal in a free air chamber that will be a few meters accross, between 10 - 50m aprox. This will be used to determine if there are ...
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Use power plug on Battery powered led lights [closed]
I recently bought three sets of led lights for my kids bedroooms. They take AA size batteries but there is also a usb port on the unit. The batteries waste after one night so I would like to try ...
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Mystery 6-pin IC in a 30 watt LED bulb
Can anyone identify this IC?
I was trying to repair a high power 30 watt LED bulb. I encountered this mystery 6-pin IC which I tried very hard to identify. Just has 'G31H' in the first line and '9L30' ...
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A6217 with 700 mA LED schematic check
I’m working on a circuit board for an amber strobe unit. It will feature eight individually addressable LEDs controlled by an ATtiny microcontroller. Each 700 mA LED will be driven by an A6217 driver ...
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Circuit implementation using MOSFET for real time application in a simple manner [closed]
To implement a simple and innovative circuit by using MOSFET or BJT and without using microcontroller in real time application.
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How can I add a 470 nm SMD LED with proper current control to a small board that already includes a camera?
I’m building a compact setup for my project (around 21mm x 17mm) that uses a board with a camera (preferably built in) and need to integrate a specific 470 nm surface mounted LED that I can turn on/...
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Why is the on-board LED of the ESP32 Blue?
Context
I know this might be a silly question but, according to this page the typical voltage drop for a blue LED is between 3V and 3.7V. A couple of weeks ago when I was designing an LED resistor ...
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Inserting LEDs in MOSFET/IGBT Gate Driver Circuits
I intend to drive my MOSFETs in the following manner:
Buffer IC (NL27WZ16 or NL7WZ16) will convert the 3.3 V PWM to a 5 V PWM which will then be given to 1ED3142MC12H. All the LEDs (LED, +15 V LED, ...
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How do I hook up LED lights to a battery pack with switch? [closed]
I got this cool picture that was previously wired with lights. I would like to get it working, but don't know how to safely do it.
It has a switch on the frame that has 3 pins I think, also looks like ...
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OZ9998MGN: backlight driver not working
I have Dell U2515Hc whose backlight stopped working.
The backlight itself works, tested with LED tester. And I can see pictures, LVDS working.
I checked:
the boost converter and it provides only 18....
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What do you call LED SMD package with 2 inline LEDs?
What's the proper name for an SMD LED chip that has 2 LEDs in series, thus dropping ~5V?
I've got some broken PCBs with SMD LEDs (~3x2mm). I'm trying to test each LED with my bench PSU and an adequate ...
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Are these LED/resistor configurations equivalent?
I don't have a lot of experience with electronics. I have some illumination modules with four 3 V white LEDs each, which I feed with a 5 V power supply. I calculated each need a protection resistor of ...
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