Practical Electronics/Frequency Modulation/555

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A reviewed version of this page, approved on 16 August 2017, was based off this revision.

Frequency modulation is the process of modifying the frequency of one signal according to another. This is the basis of FM radio, which modulates a base frequency with another signal.

Basic frequency modulation can be achieved with a 555 Timer IC. This circuit uses the voltage at the "Control Voltage" pin, Pin 5, to alter the frequency of the output.

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