This receiver with earphone listening for the medium wave range was published in Radio Electronics magazine in February 1958. The circuit was powered by a 15 V battery.
Found in an Electronic Design from the 90s, this circuit uses high voltage operationals of the...
This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit...
The circuit shown in the figure uses two of the four operational amplifiers found on the LM324...