The frequency of this circuit depends on C1 and, for the indicated values, it is 1 kHz. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
This is the project we have described, as found in a 1981 documentation. In the figure we show the...
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
This NOR gate uses an uncommon operating system today but can be implemented with more modern...