Make: Volume 43

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DIGITAL POTENTIOMETERS

Create patterns in light and sound — no microcontroller necessary

Written by Charles Platt

Photography by Make: Labs

Normally lurking unseen inside stereo systems, the digital potentiometer needs no adjustment, because it adjusts itself. Its fluctuating resistance can change the color or brightness of a light, the loudness or frequency of a sound, or any other parameters that depend on voltage and current.

STEPS ON A LADDER

Sealed inside the chip is a ladder of resistors. Figure shows the idea. The connections between the ...

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