This circuit was found in American documentation from the 1980s. The integrated circuit used is a voltage comparator of the time. Modern equivalents can be tested.
This sensor uses a capacitive system that oscillates at 45 MHz with the empty glass tube. Its...
This circuit was obtained in a 1967’s EEE. Transistors and integrated circuits can be replaced by...
This circuit was found in an American documentation and can be added to common amplifiers of any...