Today magnetic recording is used in audio and video cassette recorders, and computer disk drives. Did you know that you can also use an electromagnet to record and play back from a steel wire? In fact, this is how magnetic recording got started. This project shows you how to build a simple wire recorder. Objective
The goal of this experiment is to learn about magnetic recording heads by building and testing a wire recorder. You'll investigate the relationship between recording current and playback voltage. Other variables to investigate are the number of turns used in the coil for the recording head, and the speed of the moving wire.
Introduction
Magnetic recording has proven to be a quick, safe, and robust method for storing and retrieving information. From the first voice recordings on Poulsen's wire recorder (Figure 1), to the tape recording machines used by radio stations in the 1940's and 1950's that freed the stations from having to produce all of their programs live, to the modern hard disk drive that can store billions of bits of digital information in an area smaller than a quarter, we can see the application of the fundamental principles of magnetism...
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