Low temperature sensor (CB7814E)

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

MAX17525 High Power Adjustable Precision Limiter (COM095E)
September 2016 - Mouser Electronics is providing the MX17525 from Maxim, an adjustable High...
Proximity Switch (CB897E)
This sensitive circuit produces na outpu signal when a body is detected by the sensor. The circuit...
60 MHz Power Gain Test (CB5449E)
We find this circuit in a 1980s documentation. The integrated circuit used is unusual today. The...