Posts Tagged ‘LED’

3D POV display

Friday, May 12th, 2017

Gelstronic shared detailed instructions of how to build this 3D POV display, project instructables here: In my project i use a spinning helix of LED strips. There are a total of 144 LEDs that can displays 17280 voxels with 16 colors. The voxels are arranged circularly in 12 levels. The...

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Posted in DIY, how-to | 2 Comments »

DIY polarity Led tweezers

Thursday, May 4th, 2017

Jesus Echavarria shared detailed instructions of how to make a simple tweezers for checking led polarity: I usually assemble by hand all the boards I make. I use SMD components, especially in 0805 format for resistors, capacitors and leds. With the last ones, I always have the same problem: I need...

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Posted in DIY, tools, tutorials | No Comments »

App note: HT45F3420 LED flashlight application

Sunday, February 26th, 2017

Holtek's HT45F3420 MCU provide LED flashlight application all in with minimal external components. Link here (PDF) In traditional LED flashlight application circuits, the battery is used to directly drive the LED which will cause uneven brightness levels and the possibility of damaged LEDs due to changing battery conditions. Using the...

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ESP8266 LED lighting: QuinLED v2.6 PCB

Wednesday, February 8th, 2017

Quindor designed and built an ESP8266 LED lighting QuinLED project with Dirty Board PCBs: It’s been a long time in the making but I’ve finally put the final touches on my newest revision of QuinLED! This makes it version 2.6 rev 1.00. Let’s check it out! This post is part of...

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Posted in, PCBs | No Comments »

LED traffic light

Wednesday, January 18th, 2017

Domen Ipavec shared his DIY LED traffic light in the project log forum: Traffic lights are all around us, and they seem simple enough but are they really? Real traffic lights can be a very complicated system because it requires sophisticated control and coordination for smooth and safe traffic. The...

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Posted in AVR, project logs | No Comments »

App note: SOLERIQ® L38

Sunday, October 30th, 2016

OSRAM's filament looking LED application note. Link here (PDF) SOLERIQ® L38 (GW T3LxF1) is a filament LED with a beam angle of 360deg for indoor retrofit lighting applications. It combines the advantages of modern LED technology with the aesthetics of traditional light bulbs. The construction of the SOLERIQ® L38 consists...

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Philips T8 LED tube teardown

Tuesday, May 3rd, 2016

In a previous post Electronupdate did a teardown of a 48" T8 Cree LED tube, this time a 48" T8 Philips LED tube.  

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48″ T8 Cree LED tube teardown

Tuesday, April 26th, 2016

Electronupdate has posted a teardown video of 48" T8 Cree LED tube: LED based replacements for old T8 fixtures are finally becoming reasonably priced. I see two old competitors back at it again: CREE, and Philips. Both bulbs attractively priced, both 4000K. I tore down the Cree 1st. Longest circuit...

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App note: The LED versus LCD decision

Sunday, April 17th, 2016

Choosing between two display types, LED and LCD discussed in this application note from Murata. Link here (PDF) Users of contemporary digital panel meters (DPMs) have a variety of options available to them. While options are nice, they invariably mean more choices have to be made. After determining what meter...

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App note: Eye safety of IREDs used in lamp applications

Sunday, March 20th, 2016

This application note from OSRAM describes the possible hazards of infrared LEDs (IREDs) used for lamp applications with respect to the IEC-62471 standard and how to classify IREDs according to different risk groups. Link here (PDF) As the radiated optical power of light emitting diodes (LEDs) has increased in recent...

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PWM dimmer for RGB LED

Monday, March 7th, 2016

Lukas Fassler has designed and built a PWM dimmer for RGB LED: In my last post I’ve described the design and construction of my LED dimmer project. This project here is similar but a bit more involved. It controls RGB LEDs so it can not only change the brightness but also...

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PWM dimmer for LED lighting

Friday, February 19th, 2016

Lukas Fassler has published a new build, a DIY PWM dimmer for LED lighting: I have recently moved to a new apartment and was looking for a PWM dimmer to control some 12V LED strips. I thought that should be easy enough nowadays but it proved more difficult than I thought. All...

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App note: Projection with LED light sources

Sunday, January 24th, 2016

LEDs are now mostly used in light projection systems due to their low power requirements, long life and robustness. Here's an app note from OSRAM for proper integrations on these projection LEDs. Link here (PDF) This application note provides insights into the use of LED light sources for projection applications....

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ESP8266 WiFI LED controller hack

Wednesday, December 30th, 2015

Andreas Hölldorfer of ChaozLabs wrote an article detailing how he hacked the cheap WiFi LED controller: This pictures show the PCB. As you can see there are pins labeled as RX,TX,GND,3.3V. I simply connected an USB-Serial converter to the pins. The two other pins are GND and GPIO0. If you set a...

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Posted in hacks, wireless | No Comments »

Replacement LED driver for AN6877

Friday, December 18th, 2015

Dilshan Jayakody writes: AN6877 is linear AF level meter IC produced by Panasonic and it is commonly found on many audio equipment. This chip is no longer manufactured by Panasonic and finding replacement chip for AN6877 is also quiet difficult. The circuit described in this article is design to replace AN6877...

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Posted in LEDs | 1 Comment »

Nifty USB LED light

Tuesday, July 7th, 2015

Isonno writes, "One of the hit discoveries of Hacker Camp 5 were these little USB lights. Plugs in either way, and you turn on/off/dim by touching the back. Turns out the show is run by a chip called the Sigma SGL8022W. The datasheet has the schematic." Via the forum.

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Posted in USB | 2 Comments »

LED POV fan update

Monday, July 6th, 2015

Zach writes: I first posted on how to reprogram a "Programmable Message Fan: Model 45 Series" POV fan a few years ago, and the code I posted no longer works with the current versions of the Octave and Arduino software.  The original post still describes how the fan works and...

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Posted in LEDs | No Comments »

App note: Green LED replaces LDO regulator

Sunday, April 12th, 2015

App note(PDF) from MAXIM using a green LED as LDO for low power application Insystems in which a microcontroller must communicate with peripheral devices that operate at different supply voltages, a level translator may be necessary. This design idea explains how for lowpower loads, a single green LED can replace...

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Posted in app notes | 9 Comments »

Naked HDD activity indicator

Monday, March 16th, 2015

Frank Zhao of Eleccelerator writes: Remember my Aquarium Computer? I thought the SSD looked boring, so I put a old-school HDD inside with all the guts exposed, and wired it electrically to spin and swing when there is hard drive activity (when the HDD activity LED blinks). Project info at Eleccelerator page....

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App note: Chemical compatibility of LEDs

Sunday, March 8th, 2015

An app note(PDF) from OSRAM on LED stresses due to chemical compatibilities on their applications. The performance and stability of light emitting diodes (LEDs) may be influenced by various chemical incompatibilities arising from chemicals and materials used, amongst other things, in luminaire construction, or by gases in the proximate environment...

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Recent Comments

  • Drone: So these go for around $330 USD and NO published calibration procedure online or otherwise? Given what's inside - I don't think I'll be considering...
  • Pekka Akselin: This is ridiculous!? :-) We are back at 256(!) byte EPROMs that needed multiple, a handful, of voltages to run! :-(
  • KH: Let's try a back-of-envelope calc balancing energies. From MCP1700 datasheet, there are graphs for a 200mA load step. Estimate the energy shortfall as 12uJ. Say...
  • Daniel: It's been a week and my comment is still awaiting moderation. Apparently the CIA doesn't want their involvement known?
  • KH: Agree, so okay, I guess he must have learned from somewhere. 100nF and 1000uF is so far apart, that was jarring; it's more magic incantation...