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In old CRT televisions, the deflection yoke is the device that controls the electron beam flowing towards the screen. It’s run by an internal circuit board, but also has external pins that control the horizontal and vertical axes. Electro-music user dnny exploited this design feature by connecting audio inputs to these pins.
 Dangerous TV Circuit Bend Visualizes Audio
Internal view of the CRT with exposed deflection yoke pins.

Please note that hacking an old television like this can be very dangerous. If you don’t know what you’re doing, experimenting can result in fire, explosion, injury, or death. That being said, this successful mod on an old portable TV results in some impressive visualizations when a synth is run through it. The post on electro-music gives detailed instructions on how to do this safely.

[via Palm Sounds]

Michael Colombo

In addition to being an online editor for MAKE Magazine, Michael Colombo works in fabrication, electronics, sound design, music production and performance (Yes. All that.) In the past he has also been a childrens’ educator and entertainer, and holds a Masters degree from NYU’s Interactive Telecommunications Program.


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