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.
Avago Technologies (www.avago.com) suggests the circuit in Figure 9 for amplifying signals of...
We found this circuit in a 1986 publication. However, as it is based entirely on 555 integrated...
This circuit can be used to listen for SSB signals on receivers that do not have the built-in...