Found in a Popular Electronics from the 1990s, this circuit is a 1-digit counter that advances under the command of S2. The circuit can be expanded to more digits.
This circuit was found in an English publication from 1967. The circuit is for listening on a...
This circuit allows you to use a digital multimeter as a thermometer. The sensor is mounted in a...
This configuration, which appears in other articles on this website, was found in a European...