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Old 20th June 2011, 08:59 AM   #1871
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Location: Copenhagen, Denmark
Quote:
Originally Posted by Kostecki View Post
I'm sorry for "double-posting" but i can't just let my question drown since i really need some clarity on this
What material is it? Those driver look like the suspension is made of some kind of synthetic rubber. In that case head to your local hardware store and ask how to repair it but you might get away with just using a small strip of extra strong duct tape. Or regular duct tape and one component contact glue.
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Old 20th June 2011, 12:14 PM   #1872
Boissez is offline Boissez  Denmark
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Default Battery musings...

Hello everybody, first time poster here.

I've been reading back and forth in this thread (and around the webs) but I have a hard time gauging what kind of battery life to expect from different battery solutions.

What I wan't to build is an 'airline-friendly' setup (must fit in overhead compartment, max 5-6 kg). It's somewhat more classic than the boominators here but I'm looking for a setup that can double-duty as a real audio player when travelling - so stereo is a must.
Here are the components I'm considering so far:

- Hifimediy T1 or T2 (TK2050) - (not sure which to get )
- 22.2V LiPo Battery (ca. 4000 mAh) + balanced charger
- 2*JBL control 1Xtreme monitors (have those already) 8 Ohm, ~90db

My (totally unqualified) guesstimation is that I can count on about 2-3 hours battery @max and 20-30 hours @ more conversational levels.

Question is now... Am I completely wrong? And what would you suggest I do differently to optimize battery life?

PS: I apologize in advance if this is the wrong place to post this. I simply figured that people in this thread would have a great deal of experience with class D's + batteries.

Last edited by Boissez; 20th June 2011 at 12:34 PM.
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Old 20th June 2011, 01:25 PM   #1873
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Quote:
Originally Posted by Boissez View Post
My (totally unqualified) guesstimation is that I can count on about 2-3 hours battery @max and 20-30 hours @ more conversational levels.
That's slightly optimistic. 2 hours @max should be doable but only 10-12 hours @ very low volume.

I'd advice to get much more sensitive speakers though as those you have will probably mean you use way too much power by needing to turn it up higher.
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Old 20th June 2011, 02:29 PM   #1874
Boissez is offline Boissez  Denmark
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Quote:
Originally Posted by Saturnus View Post
I'd advice to get much more sensitive speakers though as those you have will probably mean you use way too much power by needing to turn it up higher.
I was fearing somebody would say that... But thank you for confirming my fear

Problem is that tiny efficient speakers are few and expensive - not something I'd travel with. Frankly, I haven't found any other speaker that really beats these in terms of efficiency vs size/weight (they are only 2.35 kg each and 23x15x14cm).

It does trigger another question though: would using a smaller amp help? I know these are supposed to be ~90% efficient - but does efficiency drop noticably when it plays at say 10% volume?

Otherwise I guess that I'll just have to tone down expectations and try to fit a larger battery to the amp.
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Old 20th June 2011, 02:45 PM   #1875
Wubbaz is offline Wubbaz  Denmark
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Sorry for asking this again, but I am in doubt of how I should make the central connection point.. just take all plus wires to a buttsplice and then take all the minus wires and then into a buttsplice? Red is plus, blue is minus

Thanks!
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Old 20th June 2011, 02:52 PM   #1876
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Correct. Except for the small change. Note the connection on the batteries.
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Old 20th June 2011, 06:15 PM   #1877
Wubbaz is offline Wubbaz  Denmark
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Quote:
Originally Posted by Saturnus View Post
Correct. Except for the small change. Note the connection on the batteries.
Cheers, Saturnus! Just need to fit the HP-10W's and the electronics, then I'm finished.. won't be able to paint it before Roskilde

But thanks alot for all the help you have been! Really appreciated
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Old 20th June 2011, 08:51 PM   #1878
donnib is offline donnib  Denmark
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Post Maybe this could help new people doing this

Hi,
I have read this thread many times and other threads about Boominator and i have gathered a list of important/interesting posts, parts etc for the Boominator project.

I cannot say that i am ready to my Boominator yet although i have ordered parts i still have allot of unanswered questions about the case which is the thing that gives me the biggest headache since there is no exactly design of it with size (i want to build the same design as Saturnus made with some minor modifications). I'll get back with question about this in another post.

Parts

Grill
https://elextra.dk/main.aspx?page=article&artno=H19318

Enclosure for amp6basic
Velleman nv

Sunpanel
Accubescherming op Zonne-energie 15W - Accu beveiliging & onderhoud - Conrad Electronic
FRYS.com*|*SUNFORCE

Glue for panels
http://www.tec7.dk/produkt-sortiment...ter/tec-7.aspx

Fuse for amp6basic

https://www.elextra.dk/main.aspx?pag...e&artno=H15563

Good links to parts (2009)
The Boominator - another stab at the ultimate party machine

Good list of parts needed by Saturnus
The Boominator - another stab at the ultimate party machine

Tools

Router (fræser)
https://elextra.dk/main.aspx?page=article&artno=H22748

Interesting and important discussions + useful information

Explanation on Solar Power Rating
Solar panel power rating

Discussion on power consumption

The Boominator - another stab at the ultimate party machine
Solar panel power rating

Port size and top
The Boominator - another stab at the ultimate party machine

Information on brace

The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine

Why use the resistor
The Boominator - another stab at the ultimate party machine

Effect of the resistor
The Boominator - another stab at the ultimate party machine

How to calculate the right resistor for your boominator
The Boominator - another stab at the ultimate party machine

Diagram of piezo/driver and resistor
The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine

Tip for piezos
The Boominator - another stab at the ultimate party machine

Why magnet-to-magnet construction

The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine

More on resistor, magnet-to-magnet etc

The Boominator - another stab at the ultimate party machine

Information about the case

The Boominator - another stab at the ultimate party machine

Why amorphous solar panel ?
Battery powered amp

How to create the cabinet and making an nice finish (Danish)

Sådan samler du et kabinet ordentligt og laver et pænt finish | Roskilde-Open

Size on the box

The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine

Cutting instructions by an user
http://www.diyaudio.com/forums/attac...ator_cuts2.png

PA Audio changed design on driver

The Boominator - another stab at the ultimate party machine

Google SketchUp drawing made by Saturnus

The Boominator mark II by Saturnus - Google 3D Warehouse

Building process and end result by users


Building process from an user

Image hosting, free photo sharing & video sharing at Photobucket

Building process from an user

The Boominator - another stab at the ultimate party machinestab-ultimate-party-machine-74.html#post2295893

Building process from an user

http://www.minhembio.com/forum/index.php?showtopic=262694&view=findpost&p=2909234

Building process from an user

The Boominator - another stab at the ultimate party machine

Last edited by donnib; 20th June 2011 at 09:01 PM.
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Old 20th June 2011, 11:57 PM   #1879
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Quote:
Originally Posted by donnib View Post
(...)
Wow, thats a lot of links gathered, good job

I notice you also added a link to my cabinet blog entry - i'm glad its helpful
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Old 21st June 2011, 12:28 AM   #1880
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I would like to remind people of the Boominator Meet-Up @ Roskilde Festival. Its Tuesday the 28th of June, at Agora G @ 15:00 (3pm)

Meet-up!

Also, go check out the Boominator facebook page for pictures and stuff

Boominator Facebook
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