MonoBox Mods: Same Circuit, Two Builds

MonoBox Mods: Same Circuit, Two Builds
The MonoBox on the left is John Hall's prototype which he modded with a status LED and is powered by a 9V battery; on the right is Scott Vincent's MonoBox mod built into a .50 cal ammunition can, and who heavily documented his build process (see below).
The MonoBox on the left is John Hall’s prototype which he modded with a status LED powered by a 9V battery. On the right is Scott Vincent’s MonoBox mod built into an ammunition can. He thoroughly documented his build process below.

Weekend Projects makers John Hall and Scott Vincent wrote in with their experience building the MonoBox Powered Speaker, a low current power amplifier circuit built around the LM386. These two builds really epitomize the aesthetic customizations capable with this project, with one version built into a portable rugged metal enclosure (that Scott had to troubleshoot for metal-on-metal rattling) and another version designed to be permanently plugged in. It looks minimalist, but sounds big!

Scott's circuit, mounted inside his enclosure, a .50 cal ammunition can. Note his battery holder on the underside of the lid, power toggle switch, and the primary audio circuit mounted to the raised indentation on the enclosure's base.
Scott’s circuit, mounted inside his enclosure, a .50 cal ammunition can. Note his battery holder, power toggle switch, and the primary audio circuit mounted to the raised indentation on the enclosure’s base.
Scott's speaker, a 5.25" Aura NS525-255-8A mounted on the side of his enclosure. You can see plenty more pics and read about Scott's process here.
Scott’s speaker, a 5.25″ Aura NS525-255-8A mounted on the side of his enclosure. You can see plenty more pics and read about Scott’s process here. The enclosure’s handle provides immediate audio portability!
John writes, "The internals of my second MonoBox Powered Speaker. It has since been glued shut. You can see below the circuit board where I had to chisel out a relief for the power and audio jacks. This MonoBox was intended to be left plugged in all the time, so I added a power switch (seen above the circuit board)."
John writes: “The internals of my second MonoBox Powered Speaker. It has since been glued shut. You can see below the circuit board where I had to chisel out a relief for the power and audio jacks. This MonoBox was intended to be left plugged in all the time, so I added a power switch (seen above the circuit board).”
John writes, "This is my second MonoBox. I bought a Sharp VSP1206FB406E full range (130Hz - 18KHz) 6 ohm 4.5" x 2" speaker from Skycraft Surplus. I mounted it in a 6.5" x 5" x 3" craft box, which I stained and finished. (Jo-Ann Fabrics labeled it as a walnut recipe box, but I think it may actually be basswood.) I used 14-count aida cloth (in antique white) for the speaker grill cloth. The thicker (1/4") wood is perfect for a speaker, and it produces fantastic sound without needing to tinker with equalizer settings."
John writes, “This is my second MonoBox. I bought a Sharp VSP1206FB406E full range (130Hz – 18KHz) 6 ohm 4.5″ x 2″ speaker from Skycraft Surplus. I mounted it in a 6.5″ x 5″ x 3″ craft box, which I stained and finished. (Jo-Ann Fabrics labeled it as a walnut recipe box, but I think it may actually be basswood.) I used 14-count aida cloth (in antique white) for the speaker grill cloth. The thicker (1/4″) wood is perfect for a speaker, and it produces fantastic sound without needing to tinker with equalizer settings.”

Thanks for writing, John and Scott! Did you build a Weekend Project? Send us an email with pictures and a story, and you could appear here on the MAKE blog.

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20 thoughts on “MonoBox Mods: Same Circuit, Two Builds

  1. chuck says:

    Cool builds! This was a great project. I used it to put an internal amplified speaker in a recent project. I also shop at Skycraft from time to time and they are awesome. There’s always something that I didn’t know I needed until I saw it there.

  2. Justin says:

    I too built a speaker based off of the monobox amp. I included a raspberry pi and a wifi usb to make a wireless airplay speaker.
    Blog write up

    1. Nick Normal says:

      Looks great! Thanks Justin. I’ll get this online soon. Your other projects look great too.

  3. MAKE | AirPi Wireless MonoBox Speaker says:

    […] this project has been built into a cigar box, an Italian cookie tin (with status LED), and a recipe box and ammo canister, among other builds. Now Weekend Projects maker Justin writes in with his version of this project, […]

  4. salsaman says:

    Nice builds!

  5. MAKE | The Endlessly Modded MonoBox Powered Speaker says:

    […] left a how-to question on the project page and Scott Vincent who previously built the MonoBox into an ammunition can responded. It’s great to see one maker lending another a helping […]

  6. The Endlessly Modded MonoBox Powered Speaker says:

    […] left a how-to question on the project page and Scott Vincent who previously built the MonoBox into an ammunition can responded. It’s great to see one maker lending another a helping […]

  7. lungStruck » Monobox Ammunition Can Amplified Speaker says:

    […] This project was featured on the Make Blog: MonoBox Mods: Same Circuit, Two Builds […]

  8. MAKE | The TV-Go-Sleep Universal TV Timer & the Return of Weekend Projects! says:

    […] with a wireless adapter and Raspberry Pi, adapted for two speakers, and modded into a boom cube, ammo can, and cigar box, among other novel […]

  9. The TV-Go-Sleep Universal TV Timer & the Return of Weekend Projects! - IT Clips says:

    […] with a wireless adapter and Raspberry Pi, adapted for two speakers, and modded into a boom cube, ammo can, and cigar box, among other novel […]

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I'm an artist & maker. A lifelong biblioholic, and advocate for all-things geekathon. Home is Long Island City, Queens, which I consider the greatest place on Earth. 5-year former Resident of Flux Factory, co-organizer for World Maker Faire (NYC), and blogger all over the net. Howdy!

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