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AmmoCan Bluetooth aptx speaker
AmmoCan Bluetooth aptx speaker
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Old 20th August 2017, 10:02 AM   #1
H8T3R is offline H8T3R  Poland
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Join Date: Jan 2017
Default AmmoCan Bluetooth aptx speaker

Hello,

I'd like to shere my ongoing speaker project revolting around ammunition box. Inspiration was drawn from Thodio products.

System expectations are at least 16 hr battery life at 80% power , bluetooth with aptx , usb charging capability and decent sound .

Speakers are some chinese no name brand that I picked up locally they are dirt cheep but actualy quite decent for the price . Nice stiff cone , soft rubber surround and decnt range of motion. The tweeter was the only thing that sucked hard but I've replaced it with some small but quite powerful infinity 1T and 2,2 uf cap for cut of.

First major issue that comes up with speaker is steel amunition box is that, it will rattle around and wibrate like hell if you put bare speakers in it. As a solution I've decided to make an mdf inner box for better rigidyty and accoustic properties.

I started out with measuring and laying out all the holes

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So before I made holes in front plate , the box looks like this .
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Holes in front plate were cut out with hand router and circle jig,and those in metal can were cut with water-jet. It's possible to make them with bi metal hole cutter , that's right size for your speaker drivers. nex up plate was glued on to the mdf box. After glue has fixed box was sanded down to tightly fit the metal can . I did have to press it in with my clamps to align the speaker holes.

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This tight fit ensures no box vibrations that will mess up the sound. Next things were some paint touch ups and cutting bass port hole as well as the hole for voltmeter/ usb charging module.

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Top lid of the can needs some treatment to , so I've stuck some rubber?/aluminium insulation on it as well as some dampening foam.

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Added some feet to the box :

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Last edited by H8T3R; 20th August 2017 at 04:17 PM.
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Old 20th August 2017, 10:09 AM   #2
H8T3R is offline H8T3R  Poland
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Join Date: Jan 2017
Moving further I added some speakers ,dummy module to plug the hole for voltmeter and bass port:

AmmoCan Bluetooth aptx speaker-9-jpg

I'm still waiting for most of the electronics to arrive from china. So far I've put together 12,6 , 4,4ah battery made of samsung 18650 waiting for bms to finish it.

AmmoCan Bluetooth aptx speaker-13-jpg

So far speaker looks like this :
AmmoCan Bluetooth aptx speaker-10-jpg

TO BE CONTINUED.......
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Old 20th August 2017, 11:52 PM   #3
Nanook is offline Nanook  Canada
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Location: Chinook Country.Alberta
Default a different take...

my nephew decided to make one. Amp module, motorcycle battery..4 tiny aluminum drivers from computer speakers). no bracing, no insulation , no port. Spacious sounding (wired the 2x's 2Ω speakers in series for each channel). Oh no wood box lining. Better sounding than a Bob Marley one that he has. Less apparent bass, but the Marley is overly exaggerated...with a good FR it would be very good. I think the box is for 7.62 Nato rounds (old). No divider separating the two channels of speakers.

I'll post a pic later...
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Old 21st August 2017, 07:57 PM   #4
H8T3R is offline H8T3R  Poland
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Kudos to the nephew for building one , there is always more than one way to make something, it all comes down to what works for you best.

Great, really curious how it turned out.
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Old 3rd September 2017, 12:59 PM   #5
H8T3R is offline H8T3R  Poland
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So there has been some development regarding the build , it's only missing parts are BT module and voltmeter/usb charger combo . All the cables and switches are figured out and managed , battery is complete with bms , amps is connected and signal is temporary fed from aux 3,5 jack input. I 've also installed BT antenna and dc input for charging the battery.

The Power button is hidden underneath locking handle.

So far I'm pleased with the performance amp is powerful enough and sounds quite decent. White noise is low enough to be tolerable , only bad thing realy is on/of power surge in speakers.
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Old 31st December 2017, 03:59 PM   #6
martyparish is offline martyparish
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Lookin' good! I'm about to make one as well. I also just saw the Thodio version.

Can you tell us more about the internals? (speaker size/specs, amp model)
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Old 1st January 2018, 10:47 AM   #7
H8T3R is offline H8T3R  Poland
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Thanks , Speaker wise I would say some coaxial 4 -5 inch would work just fine , or If you want to make more holes some 4-4,5 woofers and 1-1,5 ich tweeters.

You can also go with pair of full range 4-4,5 ich speakers but they will be alwys lacking highs and volume in noisy enviroments.


As for the amplifier, best bang for the buck would be this sanwu blue tda7498 board :

Sale Class D 2X100W Dual Channel Audio Stereo Amplifier Hot TDA7498 Wild | eBay

Adjustable gain.
No noticible hiss in background at gain 20db.
No pop up sound when being turned on.
Pleasant sound , lots of power for system this size.
I would consider paring it with 16,8v or 21v lipo , it will run on 12V though.

As a bluetooth source I would recomend this Sanwu module :

Bluetooth 4.2 HIFI Stereo Amplifier Receiver Box CSR64215 Digital Audio Board | eBay

It has integrated dc-dc isolated converter so , it will help to avoid ground loop problem.
It has , Csra64215a chip which has stronger antena, also extension included, and it has native support of apx codec so better sound at your disposal.

For most bluetooth modules you would need a step down converter or LM7805 voltage regulator either one will be fine.
Mini DC 6.5~28V to DC 5V MP1584 3A DC-DC Step-down BUCK Module | eBay

Build fetured in this thread was finished some time ago (It was meade to order, for mate from work) I din't uptaded this thred because nobody was interested in it.
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Last edited by H8T3R; 1st January 2018 at 10:51 AM.
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Old 2nd January 2018, 08:30 AM   #8
Nenola is offline Nenola  Finland
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Nice project! I've made some portables too. How did you build the charging interface? Those cells need to be equally charged a.k.a. balanced, right?

I've always taken out my li-ions and lipos and charged them with separate charger because I haven't found an easy and simple solution to do it in the enclosure itself.
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Old 2nd January 2018, 05:58 PM   #9
H8T3R is offline H8T3R  Poland
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Thank you, your method is pretty much the most accurate and safest way to charge 18650s , although it requires the most attention and work every single time you want to charge your speaker.

cheep chinease bms bords seem to do the trick :

1PCS SAMIORE ROBOT 4S 30A Li ion Lithium Battery 18650 Charger Protection Board 14.4V 14.8V 16.8V 4S BMS-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

And simple charger :
16.8V 1A polymer lithium battery charger, 16.8V Power Adapter Charger 16.8V1A, full of lights change,dc 3.5*1.35 free shipping-in AC/DC Adapters from Home Improvement on Aliexpress.com | Alibaba Group

I didn't have any issues with those bms boards yet and I've made couple batteries with them.

If you feel like posting some photos of your speakers feel free to do so.

This is not yet finished project , it has real potential to be ultimate ammo box party speaker although it's not really mobile weighing at 21 KG and soon even more.
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Old 2nd January 2018, 11:47 PM   #10
Dr1v3n is offline Dr1v3n  United States
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Location: Wake Forest, NC
Now that is pretty cool. Being former mil I love the ammo box idea. Thanks for posting!
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