In reality a transistor is generally added to the circuit to provide enough ... the coil has to go somewhere!). If the relay is attached parallel to a switch in some external device (such as ...

As with many inventions, two people had the idea for an integrated circuit at almost the same time. Transistors had become commonplace in everything from radios to phones to computers, and now ...

In the days before semiconductor diodes, transistors ... becomes conductive, the relay becomes energized and closes its switch. That switch activates the circuit that consists of the two ...