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PROJECT
167

Retro Color Organ

By Sara McCaslin

Learn how to create a music-activated LED display with a simple, low-cost circuit. This code-free project uses audio filters to sync LEDs with sound frequencies.

PROJECT
136

DIY Ultra Sensitive Theremino-Arduino Polygraph, Scientology E-Meter

By Mirko Pavleski

A modern replica of the so-called "E-Meter", device used in Scientology practices which costs several thousand dollars.