This circuit automatically turns off small battery-powered devices after a certain amount of time, saving battery life. We found it in a Popular Electronics from the 90s.
This circuit was found in documentation from the 1980s. The transistor depends on the desired...
This circuit for frequencies of 20 to 2 kHz was obtained in English documentation from 1966. The...
The configuration already explored in our Circuit Bench section is from the National...