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 was used to regulate the speed of small DC motors of cassette recorders. However, if the...
This circuit was found in Harris' 90s documentation. The used component is uncommon today. |...
This simple power reducer, based on capacitive reactance, was found in a 1995 documentation. The...