Found in the September 1984 issue of Radio Electronics magazine, this circuit uses common components. The trigger characteristics are given by the formula in the diagram.
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...