Differential thermometer (CB9489E)

We found this circuit in an Intersil documentation. Temperature sensors are special components of the time, then supplied by Intersil itself.

| Clique na imagem para ampliar |

Selection of diode inputs (CB4111E)
This circuit is used in transceivers, enabling input selection by diode switching through polarity...
One Quadrant Logarithmic Converter (CB15070E)
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
Fire Detector (CB13985E)
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...