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 circuit works both as a preamplifier and activates a relay when speaking in front of the...
This simple CMOS touch switch with bistable action must not be powered by a source without a...
This circuit activates an incandescent lamp (it cannot be of another type) when it gets dark. The...