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.
We found this circuit in an old American documentation. The circuit is suitable for motorcycles and...
This circuit was found in a 1977 Radio Handbook. Transistors admit equivalents. The lamp is an old...
This circuit was found in an old publication about transistors. The circuit can be used to drive...