This configuration similar to many of this site was found in 1965 General Electric documentation. Modern equivalent transistors can be used. LEDs can be used.
The integrated circuit used by SGS is not common today. The circuit is from the 1982 SGS linear...
This circuit from an old documentation includes the power supply for the 117 V power grid. It can be...
Connected to the output of an audio amplifier or radio this circuit indicates the level of the...