Found in a 1969 British publication, this circuit uses a regenerative switch with two transistors to produce pulses that depend on C1. The relay must be in accordance with the supply voltage.
This traditional circuit with the 555 was found in a 1984 documentation. In this oscillator, the...
This circuit was obtained in a publication for radio amateurs of 1977. It is used to reduce the...
This LED indicator circuit uses an LM339 comparator. The circuit was found in the January 1995...