The integrated circuits used in this configuration are not common today. The circuit is from the 1983 Intersil Databook. The indicator is 8 digits.
This circuit with germanium transistors was found in documentation from the 50's. The transistors are...
This circuit was found in an English magazine from 1978, but it is still current, just change the...
Found in an Electronic Design from the 80s, this circuit uses an unusual component today, the...