The Boominator - another stab at the ultimate party machine - Page 266 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th March 2012, 07:26 PM   #2651
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Quote:
Originally Posted by Saturnus View Post
The one with scratchy sound is toast. No way to repair it. Try it on when you've made the filter though.

The filter is the simplest possible. Glue the components on somewhere so they don't rattle around when playing. That would be very annoying.

EDIT: I really miss my stylus. I hate trying to paint freehand with a mouse.
Thank you so much saturnus, one last thing, would these sound better and more energy efficient than bying other piezoes, the PHT-407 are not cheap you know! I could buy 4 new for the price of one.
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Old 14th March 2012, 07:48 PM   #2652
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Sound is much better. Piezos are more efficient but it'll only shift it 2-3% on the total power consumption. It's the bass the sucks up most of the power anyways.
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Old 14th March 2012, 08:22 PM   #2653
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Originally Posted by Saturnus View Post
Sound is much better. Piezos are more efficient but it'll only shift it 2-3% on the total power consumption. It's the bass the sucks up most of the power anyways.
Thanks again, ill go whith the filters. Glued the box together already thoug, but what am i a cabinetmaker for anyways.
Can i get all the parts in Brink Elektronik? And hope you make a boominator happening at roskilde again.
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Old 14th March 2012, 08:25 PM   #2654
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Originally Posted by Teobreland View Post
Thanks again, ill go whith the filters. Glued the box together already thoug, but what am i a cabinetmaker for anyways.
Can i get all the parts in Brink Elektronik? And hope you make a boominator happening at roskilde again.
Yup. You can get it at brinck.

Hope we do as well.
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Old 14th March 2012, 08:40 PM   #2655
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Yup. You can get it at brinck.

Hope we do as well.
Nice, thx again.
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Old 15th March 2012, 05:20 PM   #2656
ThokN is offline ThokN  Denmark
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Originally Posted by Excile View Post
That cant have left much space for batteries? You must have made the elextronics compartment longer than the sketchup drawing.
Actually i think i will consider doing that. I found a (LxWxH) 181x77x167 sized 20AH battery that could fit then which would make the Boominator a couple of kilos heavier, but then im not as dependent on sun
Yeah we made the middle compartment wider. Actually we have room for 4x12V 9Ah batteries. (2 pairs of 2pieces in series giving us 24V 18Ah or 12V 36Ah) so we have a lot of power in our boominator We did this because we both have an Amp6 and Amp9, which we can swap between depending on how big a party we want

And just ask if you have any questions about the drawer we made!

Last edited by ThokN; 15th March 2012 at 05:24 PM.
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Old 16th March 2012, 11:08 AM   #2657
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Question About ports resonance frequency

I have been trying to google this thing and search from this thread, but I havent found answer for my problem, which is:

For my design I must place relfex tubes in the side of the Boominator and have separate handles, so I propably need to put a total of 4 reflex pipes to whole Boominator. The diameter of pipe should be around 4-5 cm.

I have been calculating with WinISD and the problem is that what the resonance frequency for the reflex pipes should be? Saturnus have explained, that the air velocity should be "too" high in this design, but how it is related to the resonance frequency of the pipe?
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Old 18th March 2012, 10:06 PM   #2658
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How does it effect the sound, if you're not changing the capacitors on the Amp6?
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Old 19th March 2012, 02:35 PM   #2659
rubennn is offline rubennn  Denmark
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I have a question for you Saturnus (maybe to some use for others as well)

When tuning a boombox design for outdoor use you use the ISD Online (LinearTeam) calculator to get the "Optimum" Vb and Fb for a vented design.

Next we divide Vb with pi and multiply Fb with square root of 2 to get the right tuning frequency. The port length is then calculated in WinISD Pro.

My questions is: Does this apply to all speakers with the required TS-parametres?

I'm asking because I tried to do it with different speakers and I found a 6" speaker which only required 2.37 litres having a tuning frequency of 93.83 Hz. That sounded too small to be true

Thanks once again, Saturnus
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Wohoo...Boominator 2012
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Old 20th March 2012, 10:43 AM   #2660
aaroe is offline aaroe  Denmark
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Just bought a panel like this: Sunshine Solar Amorphous Battery Charger 15 Watt 12 Volt

Do I need a charging regulator, or can I just connect it directly to my 7AH SLA battery?
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