We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
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...