This is one of many possible touch switch configurations using CMOS integrated circuits. The circuit is from a 1980s American documentation. The power source must be isolated.
The MOS field effect transistors of this circuit are not very common, as it is a project from the...
If interference occurs in several receivers, much more interesting than placing a filter on each...
This single-cell Li-Ion battery charger was found in a 2005 Linear Technology manual. The circuit...