This circuit was found in a 90s Silicon Chip documentation. The current of the transformer is 1 A maximum, a value given by the integrated circuits used.
This circuit was found in a 1967 General Electric documentation. The circuit generates signals...
Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time,...
This circuit, which can be used as a shield, was found in American documentation from the 1970s....