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

[Loscha]

Hi List,

   Well, it's my browser's bookmarks time to shine!

I have noted in the past that a few Synth people have experimented with
flickering LEDs.

https://cpldcpu.wordpress.com/2013/12/08/hacking-a-candleflicker-led/
This has some statistical analysis on the duty cycles of the flashing LED
they tested

https://www.evilmadscientist.com/2011/does-this-led-sound-funny-to-you/
This has a circuit that uses one flashing LED's current draw to switch a
transistor to make a non flashing LED flash in sympathy with the flashing
LED.

And the Razmasynth has a flicker LED module
https://futurevector.eu/super-warp-generator/
The page no longer has the schematic, but I seem to recall it's just the
LED and current limiting resistors?
Maybe a small cap on the input of the LED to smooth out super glitchy
inputs.

/Edward

On Wed, 12 Jun 2024 at 01:02, loss via Synth-diy <synth-diy at synth-diy.org>
wrote:

> I am building a small motor based "BUG" robot with my son. One of the
> parts the project calls for i have never seen before..a flashing led or fLED
>
> The text says that if you use a regular led the motor will not work
> properly (it must somehow be using the FLED as a timer which allows current
> to flow from the storage capacitors
> to the motor. The text gives no further explanation but it does reference
> it as a timing element.  Later projects use a hard to obtain part called
> the 1381 trigger but i would rather use parts I have on hand.
>
>
>
> Obviously I could order an FLED but as the datasheets are very sparse I
> was wondering if anyone has any idea internally how these parts work. Where
> does the timing mechanism come from?
> I was wondering if even though they are a two leg device..that internally
> they may have similarities with PUT or UJTS. I have a whole bunch of PUTS
> around.
>
> thanks!
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