Uni-directional Waveforms – these electrical waveforms are always positive or negative in nature flowing in one forward direction only as they do not cross the zero axis point. There are many different types of electrical waveforms available but generally they can all be broken down into two distinctive groups. In plain English this means that if we plotted these voltage or current variations on a piece of graph paper against a base (x-axis) of time, ( t ) the resulting plot or drawing would represent the shape of a Waveform as shown. Technically speaking, Electrical Waveforms are basically visual representations of the variation of a voltage or current over time. However, before we can begin to look at how the different types of waveforms are produced, we firstly need to understand the basic characteristics that make up Electrical Waveforms. These types of signal waveform can then be used for either timing signals, clock signals or as trigger pulses. But sometimes in electronic circuits we need to produce many different types, frequencies and shapes of Signal Waveforms such as Square Waves, Rectangular Waves, Triangular Waves, Sawtoothed Waveforms and a variety of pulses and spikes.
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