Hysteresis compensator (CB7980E)

Suggested by a 90's Linear Databook, this circuit compensates for capacitor hysteresis. The main component is from the era.

Fire alarm (CB21361E)
Found in English documentation, this circuit uses a thermistor as a sensor. The trigger point is...
Inverter Amplifier MC1558 (CB4019E)
The circuit is from the 1990 Motorola Linear Databook. Equivalent operations can be used and what...
Rain Alarm (CB6267E)
We find this circuit in an old documentation, but it can be made using modern transistors. The circuit...