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with an applied voltage, while alternating current audio or other signals may be fed into the VCO to generate FM ( frequency modulation).
A version using a quartz crystal is sometimes found in radio transmitters for frequency-modulating an input signal. The piezoelectric effect of quartz causes it to vibrate at a very high frequency, producing radio waves. VCOs are also used in the production of electronic music, to generate variable tones.
See also: oscillationSee Oscillator (disambiguation) for particular types of oscillation and oscillators. Oscillation is the periodic variation, typically in time, of some measure as seen, for example, in a swinging pendulum. The term vibration is sometimes used more narrowly, electronic oscillatorAn electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave. Types of electronic oscillator There are two main types of electronic oscillator: the harmonic oscillator and the relaxatio, modular synthesizerThe modular synthesizer is an early type of synthesizer consisting of separate modules which must be connected by wires to create a so called patch. These synthesizers are very flexible. Instead of audio, every output generates a voltage (or a current).
ElectronicsElectronics is the study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The pure study of such devices is considered as a bra