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.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This project from a 1983 publication can be assembled using more modern transistors. We can use...
The circuit shown in the figure is the version activated at the low level, of the previous circuit...