We found this circuit in an old General Electric documentation. In fact, PUTs are not common components today. The circuit is valid as a reference.
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...
This circuit is from a 1982 publication. It is a sequential effect of accelerated and intermittent LEDs....
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...