Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The sensor is of the type that is difficult to obtain today.
Found in a 1960 Sylvania manual, this circuit can be implemented with a modern equivalent...
This configuration, already presented in other points of this section and website, is of a...
We found this precise crystal oscillator for the 144 MHz band, depending on the crystal used. The...