This circuit from the 90s, found in an Electronic Engineering can be used as a shield since its control is digital with TTL logic of 5 V. The components used are still common today.
Found in an Electronic Design from 1968 this circuit generates a linear sawtooth signal modulated...
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...
This circuit is based on an operational amplifier that must be powered by a symmetrical source. The...