We found this circuit with the CMOS4046 in the August 1994 Electronics Now magazine. The circuit is activated by pressing switch S1.
Using a 555, this configuration appears elsewhere on this site. This is from American...
March 2017 - Mouser Electronics is sourcing the new Bluetooth Driver CC2564 from Texas...
Or integrated circuit used in this circuit two years 80 and little common in those days. The two...