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 the operational amplifier CA3130 was found in an English publication from 1977....
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...
This circuit was found in an English magazine from 1978, but it is current and the common 2N3055 can...