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Groups > sci.electronics.design > #742875
| From | "Don" <g@crcomp.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: A fully floating BJT-based LED current driver |
| Date | 2026-04-10 03:24 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <20260409c@crcomp.net> (permalink) |
| References | <6tltskde2lkpbo4s5g44ujar7b2tttk0k9@4ax.com> <18a493794d041b26$1$2982030$4226dc73@news.newsgroupdirect.com> <20260409a@crcomp.net> <vjgftk1k5t0ukin3sftgfp9mjpqgtbegkk@4ax.com> <5sdgtkl2jcbqq1l28a90742i1d4dbkdb7t@4ax.com> |
john larkin <jl@glen--canyon.com> wrote:
> On Thu, 09 Apr 2026 16:16:34 +0100, JM
> <sunaecoNoChoppedPork@gmail.com> wrote:
>
>>On Thu, 9 Apr 2026 09:17:04 -0000 (UTC), "Don" <g@crcomp.net> wrote:
>>
>>>Allow me to transition this topic to 120 VAC LED COB filaments. This
>>>picture shows such specimens, with the topmost powered-on and the
>>>bottommost powered-off:
>>>
>>> <https://crcomp.net/led/accob.png>
>>>
>>>The protoboard's black wire connects to 120 ACV Line while its white
>>>wire connects to Neutral. My goal is to discover the silicon secrets
>>>in such a simple filament.
>>
>>Look up NUD4011 and it's alternatives, it'll be something that
>>operates in a similar fashion.
>
> That would need the NUD chip and a bridge rectifier and maybe a
> resistor and a varistor.
>
> I'd expect simpler and cheaper in that tiny gadget.
>
> What do you call that axial lead LED thing?
It's an AC Chip-on-Board (COB) LED filament. After a lifetime of using a
resistor to carefully control current through an LED to keep it from
burning up, it sort of shocked me, so to speak, to see an LED directly
connected to Line and Neutral.
What are CoB LEDs?
LUXEON CoB Finder
A CoB LED (or chip-on-board LED) is a single device with
many LED chips mounted on a thermally efficient substrate
placed below a uniform phosphor coating.
Anyone who walks through a store or home with recessed or
track lighting likely experiences light from a chip-on-board
LED (CoB). CoBs are widely used because they emit a bright
white light output from a compact light source and are very
efficient in a broad range of applications.
So what is a CoB LED, and how is it different from other
types of LEDs?
CoB (chip-on-board) refers to the way in which the LED unit is
constructed. The basic elements of white CoB LEDs are:
An electrical power supply to provide the energy to drive the LED
The light-emitting chip or ‘die’. This is sometimes referred to as
the blue light pump, and is made of a semiconductor material,
indium gallium nitride (InGaN), which emits blue photons when
energized. A phosphor coating which converts the blue light to
white. The chemical composition of the phosphor is controlled to
produce light of a specific color temperature.
<excerpt>
<https://lumileds.com/technology/led-technology/understanding-cob-leds/>
--
73, Don, KB7RPU veritas _|_
liberabit |
https://www.qsl.net/kb7rpu vos |
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A fully floating BJT-based LED current driver "Don" <g@crcomp.net> - 2026-04-09 09:17 +0000
Re: A fully floating BJT-based LED current driver JM <sunaecoNoChoppedPork@gmail.com> - 2026-04-09 16:16 +0100
Re: A fully floating BJT-based LED current driver "Don" <g@crcomp.net> - 2026-04-09 22:03 +0000
Re: A fully floating BJT-based LED current driver john larkin <jl@glen--canyon.com> - 2026-04-09 16:46 -0700
Re: A fully floating BJT-based LED current driver john larkin <jl@glen--canyon.com> - 2026-04-09 16:57 -0700
Re: A fully floating BJT-based LED current driver "Don" <g@crcomp.net> - 2026-04-10 03:24 +0000
Re: A fully floating BJT-based LED current driver JM <sunaecoNoChoppedPork@gmail.com> - 2026-04-10 17:34 +0100
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