This 12 V x 2 A regulator was found in 1965 Delco Radio documentation. The circuit uses transistors from that time. The input voltage can vary by 15% around the indicated value.
This receiver for the mid-wave band was found in a documentation from the 60's. The transistors are made...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
When a voice signal enters this circuit, the volume of the music being played automatically...