This circuit is from old documentation, using a component that cannot be found easily today. The indicator is a galvanometer, and the input voltage is in the order of 1 V.
With the used coils and the power transistor this circuit amplifies the 5 W of a 11-meter...
The presented circuit generates a signal in the form of a ladder that can be useful for surveying the...
This circuit is from a publication from the 70s. The tunnel diode is the critical component, and...