We found this circuit in the Electronics Experimenter Handbook magazine from 1993. L1 has 2 = 2 turns of 28 or 30 wire in the shape of 0.5 cm without core. The range reaches a few tens of meters.
In the figure we have the way to adjust the output null of an operational. The configuration...
The circuit shown was found in the 1994 National Semiconductor's Linear Application Handbook. The...
This article is old, from 1994. But, for those who have an old PC and want to use a joystick from...