Low temperature sensor (CB7814E)

Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero.

Light Pulse Duration Meter (CB6752E)
Indicated by Texas Instruments, this 1968 circuit measures the duration of a light pulse captured...
XTAL oscillator with fine tuning (CB22403E)
We found this circuit in an old English documentation. The integrated circuit is of a specific type of...
Infrared Detector (CB14007E)
We found this circuit in a 1975 publication. The circuit can be made with more modern equivalent...