E)
We found this circuit in a PE Hobbyst Handbook from the 90s. The components are common, except the Geiger tube. The transformer is also a component that requires care when choosing.
In the figure we have a typical polarization circuit for MOSFETs with a high impedance...
Obtained in an American documentation from 1976, this circuit has a constant current source for...
This circuit is from a documentation from the 60s. The circuit can be built with transistors like...