Does WiFi Kill Houseplants?
Spoiler alert: No. To come to that conclusion, which runs counter to the combined wisdom of several recent YouTube videos, [Andrew McNeil] ran a pretty neat little experiment. [Andrew] has a not...
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“Vintage” Radio Gets a Modern Makeover
Taking an old piece of gear and cramming it full of modern hardware is a very popular project. In fact, it’s one of the most common things we see here at Hackaday, especially in the Raspberry Pi era....
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Fun With Negative Resistance: Jellybean Transistors
The concept of negative resistance has always fascinated me. Of course, a true negative resistance is not possible, and what is meant is a negative differential resistance (NDR). But of course knowing...
View ArticleNew Circuits with Old Technology
Before the invention of transistors, vacuum tubes ruled the world. The only way to get amplification or switching (or any electrical control of current) back then was to use tubes. But some tube design...
View ArticleProfessional Audio on an ESP32
Audiophiles have worked diligently to alert the rest of the world to products with superior sound quality, and to warn us away from expensive gimmicks that have middling features at best....
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ESP8266 Unlocks Hidden Features In Sound Bar
It’s no secret that the hardware devices we buy are often more capable than their manufacturer leads on. Features hidden behind firmware locks are a common trick, as it allows companies to sell the...
View ArticleIt’s A TV-Scope-Guitar Amplifier!
Guitar amplifiers are a frequent project, and despite being little more than a simple audio amplifier on paper, they conceal a surprising quantity of variables in search of a particular sound. We’ve...
View ArticleWell-Engineered RF Amplifier Powers Ham Radio Contacts
Typically, amateur radio operators use the minimum power needed to accomplish a contact. That’s just part of being a good spectrum citizen, and well-earned bragging rights go to those who make...
View ArticleHackaday Links: November 17, 2019
Friday, November 15, 2019 – PASADENA. The 2019 Hackaday Superconference is getting into high gear as I write this. Sitting in the Supplyframe HQ outside the registration desk is endlessly entertaining,...
View ArticleFun With A 200-kW Fiber Laser
We’ve all heard the “Do not stare into laser with remaining eye” joke. It’s funny because it’s true, as pretty much any laser a hobbyist can easily come by permanent damage to eyes unless the proper...
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Guitar Effect Built from an Old Record Player
With little more than a gutted record player, a light bulb, and the legendary 555 timer IC, [Jacob Ellzey] has constructed this very slick optical tremolo effect for his guitar. By modulating the...
View ArticleWhirling Shutters on This Field Mill Measure Electrostatic Charges at Distance
Hardly a person hasn’t experienced the sudden, sharp discharge of static electricity, especially on a crisp winter’s day. It usually requires a touch, though, the classic example being a spark from...
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ESP32 Becomes Music Player In Under 40 Lines of Code
The demo code for [XTronical]’s ESP32-based SD card music player is not even 40 lines long, though it will also require a few economical parts before it all works. Nevertheless, making a...
View ArticleSDR Transmitting Gets the Power
Most hobby-grade software defined radio setups don’t transmit. Of the few that do, most of them put out anemic levels around one milliwatt or so. If you want to do something outside of the lab, you’ll...
View ArticleFM Radio from Scratch using an Arduino
Building radio receivers from scratch is still a popular project since it can be done largely with off-the-shelf discrete components and a wire long enough for the bands that the radio will receive....
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Plant Communication Hack Chat
Join us on Wednesday, January 13th at noon Pacific for the Plant Communication Hack Chat with Lex Kravitz! As far as conversation goes, plants are usually a pretty poor choice of partners. Sure, we’ve...
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Circuit VR: Even More Op Amps
In the last Circuit VR we looked at some basic op amp circuits in a simulator, including the non-inverting amplifier. Sometimes you want an amplifier that inverts the signal. That is a 5V input results...
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It Costs WHAT?! A Sounding Into Hearing Aids
We are accustomed to medical devices being expensive, but sometimes the costs seem to far exceed reasonable expectations. At its most simplistic, a hearing aid should just be a battery, microphone,...
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Signal Conditioning Hack Chat this Wednesday
Join us on Wednesday, February 17 at noon Pacific for the Signal Conditioning Hack Chat with Jonathan Foote! The real world is a messy place, because very little in it stays in a static state for very...
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Otters Deliver a High Power Stationary Audio Experience
Our favorite raft of otters is back at it again with another display of open source audio prowess as they bring us the OtterCastAmp, the newest member of the OtterCast family of open source audio...
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