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.
This circuit found in a European publication from the 1980s, is based on PLL 566. The frequencies...
This circuit, which can be used safely, has been obtained in a 1987 documentation. It consists of a...
This circuit detects when a powered circuit suffers a malfunction, lighting an LED. The supply...