Based on an OTA LM3600 operational amplifier, this circuit was found in the July 1988 issue of Radio Electronics magazine. The range is 6 Hz to 6 kHz and can be changed.
This circuit uses a loop antenna to receive and amplify signals from the 60 kHz long wave band....
The frequency of this oscillator depends on R and C (see math section for electronics). The...
This common operational configuration can be implemented with modern equivalent. Next to the...