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 circuit has two high-impedance inputs. The gain is high and more inputs can be added. Use a...
This is a typical ohmmeter circuit with 50 uA analog instrument. The circuit was found in Radio...
Found in a Motorola manual from the 1960s, this circuit shows how to use a transistor in a static...