This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to produce a tone on a transducer when transmitting messages in SSB telegraphy.
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...