With this circuit from the September 1989 issue of Radio Electronics magazine, it is possible to receive VLF band signals on a common radio, just like the signals emitted by the previous receiver.
This crystal oscillator was found in the February 1968 issue of Radio Electronics magazine. Its...
The LM1468L can also be used. The circuit is from Motorola's Linear Interface ICs and the...
This circuit regulates the output voltage of a 12 V source or other value, given by the zener. The...