We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has two integrated circuits, one of which is a preamplifier stage. The power supply must be dual.
Found in an English publication in 1969, this circuit has a 600 kHz pass band. Ferranti's...
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
The output voltage of this source is not established instantly when turned on, but slowly avoiding...