LED blinker circuit from Youtube

At first I saw this circuit from a Youtube video:

and thought: "that's interesting, I should try it"

source: https://www.youtube.com/watch?v=Yw6L5w4TDxw

But then after doing a blog search (which is handy) I found this:

https://wb9kzy.blogspot.com/2024/07/led-flasher-circuit-from-sprat-199.html

BLINKIN' ECK (from SPRAT 199 & 201) is basically the same circuit except the 330 ohm resistor has been "Muntzed" 

see: https://www.electronicdesign.com/technologies/boards/article/21771148/whats-all-this-muntzing-stuff-anyhow

I also saw a different LED flasher circuit using a MOSFET and two LEDs with one resistor:

source: https://www.youtube.com/watch?v=Bc6aLoFsQkg

but really it's kind of a cheat because one of the LEDs is a blinking LED by itself, so if the idea is to blink an LED just go with the blinking LED and a resistor, why add another LED and a transistor ?

So I didn't bother to build either of the Youtube circuits, better to stick with SPRAT :)

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm