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

Benjamin Tremblay btremblay at me.com
Wed Jun 12 12:43:09 CEST 2024


I was taking apart a toy robot a couple of years ago and discovered it used self-flashing LEDs. I purchased some off Amazon and googled them. Apparently some of these multicolor flashing LEDs can produce a specific color if you feed them a specific PWM amount from your microcontroller; a poor man’s Neopixel.
But never tried this.
Benjamin Tremblay

> On Jun 11, 2024, at 1:13 PM, Matthew Skala via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> On Tue, 11 Jun 2024, mskala at northcoastsynthesis.com wrote:
> 
>> chips.  This one uses an LFSR to create pseudorandom flickering:
> 
> Oh, maybe not.  I should have read the caption more carefully - it claims
> the chip is using "phase difference between two RC oscillators" for
> randomness (not sure how that works but it's what it says) and *other*
> chips use LFSRs.
> 
> --
> Matthew Skala
> North Coast Synthesis Ltd.
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