[sdiy] flashing LED?? blinking led FLED (are they internally similar to a UJT?)

[Didrik Madheden]

On Tue, 11 Jun 2024, 19:04 , <mskala at northcoastsynthesis.com> wrote:

> On Tue, 11 Jun 2024, Didrik Madheden via Synth-diy wrote:
>
> > Which exact method they use is hard to know, but it could be anything
> from
> > some simple multivibrator to a digital circuit which in turn might have a
> > simple RC oscillator on board that feeds a divider. The latter might be
> more
> > likely since the divider circuit can work with an arbitrarily high input
>
> ZeptoBars has published die photos of a number of different LED flasher
> chips.  This one uses an LFSR to create pseudorandom flickering:
>    https://zeptobars.com/en/read/candle-flicker-LED-LFSR-RC-oscillator

Oh, that gave me an idea. I only considered flashing at a set frequency.
What might pseudorandom one be used in? Those little battery powered tea
light replacements of course. So, again in the interest of being a fun
kid's project, I'd suggest to the original question that you go and buy and
harvest such a light for an LED. It might work, it might not, but it'll be
a little adventure for you and your son.



> > Here a second tangent. You can make an observation that you need a quite
> > high number of components if you're going for absolute minimalism. Even
> the
>
> It's a crazy world we live in...
>
Btw, I stumbled over my words. What I meant to say was that analog
circuits, despite being "simpler" than a microcontroller on paper often
uses more components and are less flexible than a minimal MCU solution.
Which of course can matter for a size constrained project.

/Didrik

>
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