Fernandes Sustainer

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The Fernandes Sustainer is a device fitted to the electric guitar, usually in models produced by Fernandes Guitars, but it is also supplied as a kit for fitting to new or existing guitars.

It works on a similar principle to that of Michael Brook's Infinite Guitar, and can be considered a commercial version of such. It is not the first such attempt, and its main commercial rival is the Sustainiac.

When activated, the note from a standard guitar pickup is amplified and fed back into a separate pickup coil. When this additional impulse is in phase with the string vibration, the result is a continuous sustained note.