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Sine Waves, Squares Waves, and the Occasional FFT
I became aware of harmonics and the sound of different shaped waveforms early in my electronics career (mid 1970’s) as I was an avid fan of [Emerson Lake and Palmer], [Pink Floyd], [Yes], and the list...
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Logic Noise: The Switching Sequencer Has the Beat
Logic Noise is all about using logic circuits to make sounds. Preferably sound that will be enjoyable to hear and useful for making music. This week, we’ll be scratching the surface of one of my...
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Glitching Square Wave Clock Is Designed To Confuse
[Voja Antonic] has built a clock that tells the time in binary with square waves, and trolls the uninitiated in electronics. The clock itself is very attractive. If you look closely you can see the...
View ArticleFollow the Bouncing Ball of Entropy
When [::vtol::] wants to generate random numbers he doesn’t simply type rand() into his Arduino IDE, no, he builds a piece of art. It all starts with a knob, presumably connected to a potentiometer,...
View ArticleTachometer Uses Light, Arduinos
To measure how fast something spins, most of us will reach for a tachometer without thinking much about how it works. Tachometers are often found in cars to measure engine RPM, but handheld units can...
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Your USB Serial Adapter Just Became a SDR
To say that the RTL-SDR project was revolutionary might be something of an understatement. Taking a cheap little USB gadget and using it as a Software Defined Radio (SDR) to explore the radio spectrum...
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Modeling The Classic 555 Timer On A Breadboard
Over the years, readers have often commented that microcontrollers (or more specifically, the Arduino) are overkill for many of the projects they get used in. The admonition that the creator “Should...
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This Frequency Generator Knows How To Get Down
What kind of clever things could you do with a signal that had a period of 2 hours? Or 20? Any ideas? No seriously, tell us. Because [Joseph Eoff] has come up with a way to produce incredibly low...
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Keep Coffee Warm Through Induction Heating
Transformers have an obvious use for increasing or decreasing the voltage in AC systems, but they have many other esoteric uses as well. Electric motors and generators are functionally similar and can...
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Custom Christmas Light Controller Blocks Blinks
Finding that his recently purchased LED Christmas lights defaulted to an annoying blinking pattern that took a ridiculous seven button presses to disable each time they were powered up, [Matthew...
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