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.
Suggested by Mullard in an old documentation, this circuit is based on a common phototransistor and on...
This is one of the many hysteresis comparator circuits the reader may find in this section and on this...
These circuits (with some changes) are parto f the sample banl of the Multisim 11. Simulated in...