Found in Motorola documentation from the 1970s, the circuit presented uses a component from the era that is not common today. The characteristics of the coils are given next to the diagram.
This simple circuit with good gain using just one transistor was published in Radio Electronics magazine...
March 2017 - This new component of Vishay has a 16-bit resolution that allows it to be used in a...
Found in documentation from the 1970s, this circuit for resistive loads uses a trigger...