Guitar & Ukulele Tuners

A needle, LCD or regular LED type guitar tuner uses a microprocessor to measure the average period of the waveform. It uses that data to drive the needle or array of lights. When the musician plays one note, the tuner senses the pitch. The guitar tuner then displays the dig in relevance the required pitch and indicates whether the input pitch is lower, higher, or equal to the desired pitch.

With needle displays, the note is in tune when the needle is in a 90° vertical position, with leftward or rightward deviations indicating that the note is flat or sharp, respectively. Tuners with a needle are typically furnished with a backlight so that the display can be read on a darkened stage. For block LED or digital display tuners, markings on the readout drift left if the note is flat and right if the note is sharp from the desired pitch.

If the input frequency is matched to the required pitch frequency the LEDs are steady within the middle and an 'in tune' reading is given. Some LCDs mimic needle tuners with a needle graphic that moves within the same means as a real needle tuner. Somewhat deceivingly, many LED displays have a 'strobe mode' that mimics strobe tuners by scrolling the flashing of the LEDs cyclically to simulate the display of a true strobe. However, these are all just display options. The means a guitar tuner 'hears' and compares the input note to the desired pitch is strictly constant, with no change in accuracy. There are many other electronic tuners available, ukulele tuner and bass guitar tuner are just a small selection. 

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