In this 1990s circuit, found in a National Semiconductor manual, the output voltage is the square of the input voltage. The components are from the period.
This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967...
This transistor tester configuration can be found on this website with many variations. The...
This high current control circuit was found in a publication from the 1990s. The power transistor must...