This circuit is from a 1924 book by Gernsback. The receiver uses two tubes and listens to headphones. Power is supplied by battery with the indicated voltages.
The circuit shown in the figure consists of a low voltage dropout (LDO) regulator for 200 mA using...
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
Found in American documentation from the 1970s, this circuit can be designed based on a modern SCR,...