We found this circuit in the November 1974 Radio Electronics magazine. The capacitors determine the output time, and it is normal to obtain 1 second for each uF used.
This is a 6-bit counter, ideal for digital electronics classes or as a electronics teaching...
EDN magazine in a 90's issue published this TTL technology debouncer flip flop circuit, in this...
Using a dual 555 CMOS this very useful circuit on the bench was found in the July 1998 Electronics Now...