![]() Passive loads typically use resistor banks but since this one is active, it needs a very large inductor to handle the amount of current being produced by the amplifier. ![]() The reactive load is essentially a dummy load for the amplifier that replaces a speaker with something that won’t produce sound. wanted to build a reactive load for using tube amps without generating a huge quantity of sound, and it resulted in an interesting project that also taught him a lot about inductors. ![]() ![]() Plenty of musicians swear by the warm sound of amplifiers with vacuum tube circuits, but they do have some limitations. The sound produced by any given electric guitar is shaped not just by the instrument itself but by the amplifiers chosen to make that sound audible. We’ve shown some other radio projects using Arduinos and the TEA5767 IC in the past, such as this one on a tidy custom PCB, and this one built into an old radio case.Ĭontinue reading “DIY Arduino Due TEA5767 FM Radio” → Posted in Arduino Hacks, Radio Hacks Tagged amplifier, arduino, diy, fm, LM4811, oled, PAM8403, radio, receiver, sh1106, TEA5767, tuner There are so many resources available to us these days and standing on the shoulders of giants has always been a great way to see farther. It’s easier than ever before to quickly put together projects like this by connecting pre-built modules and downloading code from the Internet, but that doesn’t mean it’s not a worthwhile way to improve your skills and make some useful devices like this one. The enclosure is made from PVC panels, and accented with colored adhesive tape for style. The sound signal is passed through an LM4811 headphone amplifier for private listening, and a PAM8403 Class D audio amplifier for the built-in loudspeaker. An Arduino Due forms the heart of the project, controlling a TEA5767 module, an SH1106 128×64 pixel OLED display and a rotary encoder. The design is fairly straightforward, based as it is on another project that found on another site, but the build looks very slick and would take pride of place on any hacker’s workbench. has brought the idea right up to date by building an FM radio with an OLED display, controlled with a rotary encoder. Times have changed, but there’s still something magical about gathering invisible signals from the air and listening to the radio on a homemade receiver. Older hackers will remember that a crystal set radio receiver was often one of the first projects attempted. We may have seen other homemade vacuum tubes before - we even recently featured a DIY X-ray tube - but there’s something about ’s tubes that really gets us going.Ĭontinue reading “A Homemade Tube Amplifier Featuring Homemade Tubes” → Posted in classic hacks Tagged amplifier, cathode, grid, plate, retro, triode, tungsten, vacuum tube, vintage They don’t sound great, but there’s no doubt they work. The one nod to modernity is the clever use of doorbell transformers, one for a choke and one for the speaker transformer. Built in 1920s breadboard-style, the features some beautiful vintage mica capacitors and wirewound resistors, plus a variable resistor the likes of which we’ve never seen. Speaking of charm, we just love the amp these tubes went into. Sure, the heaters glow as bright as light bulbs, but that’s all part of the charm. Given all that, you’d expect the tubes to look a lot rougher than they are, but even with plain tungsten wire heaters and grids made from thick copper wire, they actually work pretty well. ![]() But when your lathe is a cordless drill, and you’re using a spot welder that looks like it’s cobbled together from junk, your tube-making game gets a lot harder. Making vacuum tubes with all the proper equipment - glassblower’s lathe, various kinds of oxy-fuel torches, all the right hand tools - is hard enough. But really, you’ve got to check this out. Now, we get it - some readers are going to find it hard to invest an hour in watching make a pair of triodes to build his amplifier. Especially when those parts include vacuum tubes, and doubly so when you make the vacuum tubes from scratch too. With the wealth of cheap and highly integrated audio amplifier modules on the market today, it takes a special dedication to roll your own from parts. ![]()
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