Gary, I feel your frustration...
This particular circuit has had me flummoxed for years (yes, YEARS!)!!









.
IT HAS NEVER WORKED! Either as a sim (both LEDs ON, no flash). 0r as a real ckt on a bread board.
View attachment 116103
(Texas Instruments "TINA")
That very
same circuit here.
What am I missing (if anything)?
And, yes, I have changed component values just to make sure that my math skills haven't gone kaflooey...
Anybody else care to comment?