This sensitive receiver for the medium wave range was found in Radio Electronics magazine from December 1960. The circuit has a headphone output and is powered by just 3 V.
This power supply, found in an Argentine publication from the 1970s, uses a wire potentiometer of 25 W or more...
We found this circuit in a publication from 1966. The components are from the period. Complete...
Found in an 80's documentation this circuit uses an integrated from the uncommon era today. Other...