The diagram is from a 1990s document. The integrated circuit must be equipped with a heat sink. The table shows the component values for different output voltages.
This line protector circuit was found in a 2002 documentation, but it is totally current and...
This antenna for the frequencies 146 or 440 MHz was found in a magazine 73 for Amateur Radio of...
With this circuit it is possible to increase the output voltage of a 7812 regulator. The circuit...