This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL outputs. The circuit can be adapted to function as a shield.
This zero-crossing detector circuit produces an output pulse every time the input sinusoidal...
This circuit for the 3.5 MHz band (80 meters) was found in an old radio amateur documentation. The circuit...
This circuit was found in a 1980s documentation. Similar configurations appear in the section, but from...