# What is a sine wave generator?

A sine wave generator is a type of electronic equipment that generates an oscillating frequency in a sine pattern. Most are relatively small, the vast majority being portable. There are a few different reasons why these types of tools are important, but most have to do with measuring sound or electrical frequency, which typically take a sinusoidal pattern. A sinusoid function rises and falls and rises and falls in a consistent, smooth, undulating pattern of hills and valleys. In mathematics, these curves are often plotted and measured, and in natural settings they often say a lot about speed, volume, and other amplification issues. A sine wave generator produces these waves, usually as a means of comparing or measuring waves existing elsewhere.

Sine wave generators are used for many tasks, including calibrating measurement equipment and generating sound effects.

Understanding sine waves in general

A sine wave is characterized by continuous, uniform oscillation that can be graphically represented as a series of perfectly proportioned “hills” and “valleys”, or peaks and troughs. Light waves and sound waves naturally take this form, as do many other natural phenomena, such as ocean waves. Most electrical outlets also follow this pattern.

Tracing and identifying the sinusoidal functions of these outputs can be instructive, but there are also cases where generating artificial imitations or mimics can also be useful. This is where sine wave generators come in. Most of the time, these devices are used by people looking to calibrate a device or fix something that is not working properly. Generators emit frequencies equal to what they detect, which can allow engineers to see the exact patterns being emitted naturally; most devices can also emit pre-programmed specification waves, which can help recalibrate items such as sensitive sound equipment or amplifiers.

Audio and electrical uses

A sine wave generator can drive audio speakers if the wave generated is in the range of human hearing. Technicians first measure the speed of the wave being emitted, then regenerate it with their devices to sync and usually also amplify the sounds being produced.

The same technique can be applied to electronic and electrical appliances in general. Alternating electrical current (AC), which is available at wall outlets in most places, alternates in a sine wave pattern at 60 cycles per second (Hertz). A turbine or electrical generator that produces alternating current is a type of sine wave generator. Some electrical circuits, specifically resonant circuits, oscillate in the pattern of a sine wave and are therefore used in sine wave generators. Sine waves are produced by a resonant circuit when the voltage at the output rises and falls in a sinusoidal pattern.

function generators

Function generators can typically produce sine waves and other waveforms such as square and triangle waves by adding several different waves. Any periodic or oscillating function can be described as a weighted sum of multiples of the base frequency. A Fourier transform, for example, is a mathematical function that describes which sine waves added together will form the desired wave.

Square waves and other variants

Oscillators can often generate waves of different shapes by generating multiple overlapping sine and cosine waves. Common examples include square waves that go up and maintain a level for a time, and then drop to the inverse of the original level and maintain that for a time, and then oscillate back up again, repeatedly. Square waves are used in digital electronics to produce an on/off signal at consistent intervals to drive digital logic, thus serving as internal timing clocks that regulate actions in computers. The speed of a computer processor chip is described by the frequency of its internal clock in a unit called Hertz. The computer is described as working at a speed of a certain number of gigahertz (GHz). One cycle per second equals 1 Hertz.