Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio transmission by optical fiber. The components are common.
The basis of this circuit is the 723, an old integrated circuit not easier to find these days. The...
Found in a 1980s documentation, this circuit uses as base a component of the era. The formula for...
The original version of this circuit was suggested by an old Radio Electronics (1990). The circuit can be...