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.
This circuit was found the Optoelectronics Sourcebook by Texas Instruments. Any phototransistor...
Applying an operational of the time, this circuit of an old documentation can be elaborated with modern...
This circuit appears on the site in several variations depending on the source. This is from a...