Found in the May 1988 issue of Radio Electronics magazine, this circuit is sensitive to small variations in input voltage. The power supply must be symmetrical.
This circuit is from a 1974 publication, but it can still be easily assembled today with BC548...
This touch sensor, found in an American documentation on transistors, has gained 8 million times...
This configuration with two operators was found in a circuit manual from the 1980s. However, it...