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 can be used with 5 to 15 V sources and the zener diode must be chosen according to...
Here we show how a Constant Current Source can be created in the Multisim Blue using a common BJT...
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...