This circuit was found in American documentation from 1966. It uses a hall effect sensor at the time to detect magnetic fields.
Figure bellow shows how the 4088 or 4018 can be used as a touch switch. Two metal plates separated by 1 mm...
This circuit consists of a voltage regulator for 6 V batteries with a very low voltage drop. The...
This shield was found in the June 1995 Electronics Now magazine. The circuit uses a low-power...