This 600-ohm line driver was found in a 1980s documentation. The integrated circuit used is not common today.
This circuit was found in an old American publication from the 70s. It flashes a warning lamp,...
This circuit can measure the power of loads up to 1 kW and its accuracy depends on the settings and...
This circuit, from a 1977 documentation, uses two 555 or one 556 (double 555), being able to...