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.
Found in Radio Electronics from the 90's, this circuit can be implemented with other operational...
We found this configuration in a documentation for radio amateurs from 1974. The circuit can be...
In the figure we have the way to use a common LED as a light sensor. The operational power supply...