Many traders rely on a series of technical indicators to identify market trends. Among these is the advance/decline line, which can establish whether more stocks are rising than falling at a given ...

Many ‘busy’ indicators for use in telephone systems present undesirable loading of the telephone line. Some circuits are very simple indeed to the extent of only loading the line when it is not in use ...

The circuit is designed to connect in parallel with the telephone line, to monitor and detect if any telephone in the same line is busy, with the indication of the LED and which is self-powered so ...