Voltage Regulators: An Introduction

We finish off our Introduction to Electronic Components series with the voltage regulator, which is a useful little thing. Sometimes, you have more voltage than you need—say, when you’re working with a 9 volt battery but you need 5 volts for your circuit. Also, if your project is especially finicky, they can also take in a fluctuating amount of voltage and emit a perfectly constant value.

If you’re looking for more about other components (say…diodes, buttons and switches, resistors, etc etc) check out the whole playlist!

 

Visual Microphones: The Future is Now

The minutest movements of plant leaves. A glass of water: deceptively still. A bag of chips, lying discarded on the table. One of these things may be slightly less poetic than the others, but they do have one thing in common: scientists from MIT can recover sound from all three.

Calling it “the Visual Microphone” a team of researchers are using visual data to recover sound from videos of everyday objects. These objects are seemingly still to the naked eye, but upon reviewing the video, researchers were able to pinpoint the modes of vibration of these objects.

From their abstract:

“When sound hits an object, it causes small vibrations of the object’s surface. We show how, using only high-speed video of the object, we can extract those minute vibrations and partially recover the sound that produced them, allowing us to turn everyday objects—a glass of water, a potted plant, a box of tissues, or a bag of chips—into visual microphones.”

Comprised of Abe Davis, Michael Rubinstein, Neal Wadhwa, Gautham Mysore, Fredo Durand and William T. Freeman, the team’s website says they’re working on releasing code and data. But so far, they’ve posted sound samples of their work. Check it out here.

The Science of Wikidrummer

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We’re back from spring break with a new video!

Drummer Julien Audigier and Audio Zéro put together the Wikidrummer video, an exploration of different environments and the effect these spaces had on drum sounds.

In this video, we break down the science behind why all of these spaces sound different. We’ll also show you our own reverb experiment, and how you can incorporate physical spaces into your music, even if it was recorded somewhere else.

Wah Pedals: A Look “Under the Hood”

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Since their invention in 1966, wah pedals have had a prolific history in modern rock music. From Jimi Hendrix’s “Voodoo Child” to David Gilmour in “Echoes” (where it was used backwards). But what goes into a wah pedal? How does it get that distinctive, “cry baby” sound? Let’s get under the hood and find out.