We found this circuit generates signals from 200 Hz to 62 kHz and can be used to repel mosquitoes and mosquitoes. The circuit can be powered from 2 small batteries to 9 V battery.
This traditional oscillator uses two complementary transistors to produce low frequency signals....
This oscillator produces a rectangular signal in the range of 100 Hz to 1k Hz but with the change of...
This electronic “windsock” is operated by a magnetic switching system. It was found in a Radio...