Found in a publication for radio amateurs from the 1980s, this circuit amplifies signals in the 60 kHz band (VLF), Winding data from the ferrite antenna are provided along with the diagram.
This circuit was found in an article in Radio Electronics magazine. The issue is from July 1992...
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...