This circuit, which can serve as a reference for restorations, was found in the October 1989 issue of Radio Electronics magazine. The circuit uses a 5-digit display and a dedicated integrated circuit.
We found this circuit in November 1983 Radio Electronics magazine. The circuit drives an LED and...
This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values...
This circuit was found in a 73 amateur radio magazine from the 90s. An LED extends the scale from 0...