This 3 and-a-half digit circuit was found in a Teledyne documentation from the 90s. The circuit uses a thermocouple as a sensor. The integrated circuit used is uncommon today.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...