Found in a 1965 General Electric circuit manual, this circuit uses SCRs from that time. Modern equivalents according to the power can be used.
This circuit with the XR2206 IC squares the value of a voltage. The circuit was published in the...
Motorola's MFC4010 integrated circuit is uncommon in the market today, as the application is from...
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...