Found in National Semiconductor documentation from the 1990s, this circuit corrects the curvature of the response curve of an RTD temperature sensor. The components used are from that time.
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
This traditional crystal radio circuit, but which has a modern version with diode, was found in an...
This headphone amplifier using a pickup coil can be used as an extension for devices such as TVs,...