Boing Boing reader Ross "rossindetroit" Hershberger created the Monobox, a nice speaker with a built in amp based on the venerable LM386 IC. MAKE produced a nice how-to video about it for its Weekend Projects program. This is a great project for parents and older kids (I'm guessing 9 and up).
MonoBox is a small, inexpensive powered speaker that amplifies the output of your headphone music player. It's little but it's loud! All the circuit parts are available from RadioShack. The speaker and cabinet are left to your preference.
You'll learn how to assemble and solder an audio power amplifier using an integrated circuit (IC) chip, and how to choose a speaker and install it in a cabinet with the amplifier.
The core of MonoBox is a compact and efficient audio amplifier based on the LM386 power amp chip. It will run on 200mA of current using power supplies from 6V–15V DC. This gives you the flexibility to power it from a wall adapter, a 9V battery, or a car accessory outlet.
You're probably thinking, "Sure, but it's so small. Does it rock?" Fair question. The prototype has been exhaustively tested and it does indeed rock. Maximum volume output is 90dB, and with the added bass boost your socks will be rocked clean off!
Complete step-by-step instructions for making a MonoBox
James Cawley is a 50 year old Elvis impersonator from Ticonderoga, NY; his friend William Ware Theiss was costume-designer for the original Star Trek series, and left Cawley the blueprints for the original Star Trek Enterprise sets in his will — so Cawley rented out a 13,000 sqft shuttered supermarket and built an exquisite replica […]
A couple of weeks ago I reviewed New Matter’s MOD-t 3D printer. It was $400 at the time, but the price has temporarily dropped to $340. This is a great deal for an excellent 3D printer. I’ve been using mine like crazy since I got it.
Network Time Protocol is how the computers you depend on know what time it is (this is critical to network operations, cryptography, and many other critical functions); NTP software was, until recently, stored in a proprietary format on a computer that no one had the password for (and which had not been updated in a […]
The Boing Boing Store’s Gift Guide is full of ideas for pretty much anyone in your life like hipster ice cub trays, Xbox controllers, Halo Boards, and even diamond necklaces. As always, all products in the Boing Boing Store come at great discounts, too. Shop by price bucket starting at under $20. Under $20:Bloxx Jumbo Ice Trays […]
Unlike traditional lighters, the SaberLight features an electronic plasma beam that’s both rechargeable and butane-free. This sleek lighter is even approved by TSA, so you’ll never be stuck buying lighters you’ll just have to throw away partially used. For some people, like me, this is a pretty big game-changer. The SaberLight’s beam is actually both hotter and cleaner […]
Holiday shopping is in full swing, and the Striiv Touch is one of the best gift ideas I’ve landed on. Its simple design works for females and males, and its wide range of features makes it suitable for even the non-fitness enthusiasts in your life.Unlike traditional fitness trackers, the Striiv Touch also acts as a smartwatch. It […]