We found this circuit in a documentation from the 90's. The coil has its characteristics given next to the diagram. Power is provided by a 9 V battery and a range of a few tens of meters.
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...
This is the conventional version of capacitance multiplier with operational amplifier that appears in...
) The integrated circuit used in this control is uncommon today and the maximum current obtained allows...