This circuit generates a strong audio tone that scares away mosquitoes. Care must be taken that, due to its potency, it can also cause discomfort to very close people and domestic animals.
We found this sensitive moisture detector in an old documentation. The circuit uses a common JFET,...
This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...
This circuit was obtained in an American documentation of 1964. The transistors are of the time....