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.
Found in a 90s Hands On Electronics, this small preamp finds applications like microphones and other...
I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor...
This circuit for the car was found in the April 1990 Radio Electronics magazine. The speaker is...