This ultra-low noise amplifier and simple power supply was found in Analog Devices documentation from the 90's. The circuit can be implemented with modern equivalent components.
TDK's TAS Series Magnetic Angle Sensors can be obtained from Mouser Electronics. The components...
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
This General Electric circuit was found in a 1964 documentation. The circuit triggers a relay when...