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

[Vladimir Pantelic]

I remember that in the 90s I built an artsy object that had three fLEDs 
(normal looking 5mm red LEDs that flashed) hidden in the back and 3 
normal green LEDs wired between each pair of the fLEDs. the green LEDs 
would blink in random patterns as the fLEDs frequencies were all 
slightly off and would beat against each other...


On 11.06.24 16:57, loss via Synth-diy 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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