The integrated circuits used in this configuration are not common today. The circuit is from the 1983 Intersil Databook. The indicator is 8 digits.
June 2017 - Microchip's new PIC18LF67K40 8-bit microcontrollers with Flash / EE / RAM memory and...
The circuit shown is from old English documentation and can be made with BC548 transistors for low...
This preamplifier circuit with a CK722 transistor appeared in Radio Electronics magazine in...