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Class D Switching Power Amplifiers and Power D/A conversion

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Old 2nd April 2011, 02:43 PM   #991
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Location: Copenhagen, Denmark
Quote:
Originally Posted by ThokN View Post
We will have some 'bøsninger' into each speaker compartment, so that we can shift between the two amp-outputs. We have also made the center compartment as a sort of tray that you pull out from the side of the Boominator. In this tray there will be both batteries, amps, volume knob and powerswitch etc. So the whole middle compartment can be taken out as a tray.

If we imagine that both speaker out from Amp6 and Amp9 was going into the same shared cables for the speakers, will that burn the non-operating amp or something? Or will it be okay to do? Because that would be even simpler.


I've decided to go with a 4-pole 2-way switch, and a seprate 2-pole single-way switch for the power. The power switch will be placed before the amp-switch. The reason for this is that it would otherwise not be possible to have the solar-cell connected at all times. If we used a single 4-pole 3-way switch, then the solar-cell would only be connected when the switch is set to Amp6(12V)-mode. This would also mean that we would get the benefit of the sun whenever the boominator is turned off (middle-position of the switch).
I don't know if you could connect both amp outputs at the same time. But I seriously doubt it. And regardless it will affect sound a lot.

You could also have 2 panels and just connect each directly on each battery. That would solve that problem.
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Old 2nd April 2011, 02:55 PM   #992
ThokN is offline ThokN  Denmark
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Ah yes you are right, we could do that. But anyway, I think I like the seperation of power and amp switches.

Also, I will definately not connect the amps together then
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Old 2nd April 2011, 03:45 PM   #993
ThokN is offline ThokN  Denmark
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I have a slightly off-topic question that I didn't find answer for elsewhere, so I hope you epert could quickly help:
It's a small ghettoblaster which I'm building for a girl-camp at Roskilde. I hope someone in here could help me approximate the cabinet-size if I have 2 of these 6½" speakers,
SP-167E
It needs to be reasonably portable and loud, soundquality not that important. The amp is based on the same chip as Amp6-B. Piezo tweeters will also be installed.

Also if they should share the same volume, and if it then has to be mono?

I know basically everything else in this build, so I just need quick help with this if you can, and not drift offtopic in several posts
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Old 4th April 2011, 03:29 PM   #994
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Hi all,

partly inspired by this thread (cheers for the great info all) I built one of these:

Click the image to open in full size.

I'm now in the process of shifting to a 2050 based amp to see how much more volume I can squeeze out of it.
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Old 4th April 2011, 08:44 PM   #995
kblnig is offline kblnig  Denmark
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Quote:
Originally Posted by fraction View Post
Hi all,

partly inspired by this thread (cheers for the great info all) I built one of these:

Click the image to open in full size.

I'm now in the process of shifting to a 2050 based amp to see how much more volume I can squeeze out of it.
Nice i really like the combo of a suitcase and a boombox - you can bring it everywhere!!! how is the sound?
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Old 4th April 2011, 09:10 PM   #996
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Originally Posted by kblnig View Post
Nice i really like the combo of a suitcase and a boombox - you can bring it everywhere!!! how is the sound?
Sounds pretty good, although not as much bass as I'd like. Unfortunately it was outclassed when put near proper mobile sound systems (car battery powered on bike trailers), hence the amp upgrade. I just finished sticking in the new amp and 2x12v 7ah batteries wired up to 24v and it's proper loud now. Equivalent to one of my 100w db technologies active PA speakers imo.

This thread has been awesome btw, although I'm fairly certain I need to read up on what all those speaker parameters mean - the only one I understand is SPL I just bought some second hand guitar drivers and stuck em in the first suitable box I found
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Old 5th April 2011, 04:43 PM   #997
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this is my boombox

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

solar cell / diy Stepup converter 14V

400Mhz PC/104+
512MB Ram
Touch Screen.
Creative Xmod sound card.

Pink ?? Why Not it's different....

3X TPA3112 homemade amps

3x random speakers
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Old 6th April 2011, 06:15 PM   #998
ThokN is offline ThokN  Denmark
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Does anyone know of an equivalent to the piezo's from elextra.dk that ships to denmark?

https://elextra.dk/main.aspx?page=article&artno=H19399

Because we ordered them, but they are sold out and will not be in stock before the beginning of june

What about these?

http://cgi.ebay.co.uk/10-X-PIEZO-TWE...item3354350cdf

Last edited by ThokN; 6th April 2011 at 06:42 PM.
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Old 6th April 2011, 06:59 PM   #999
ThokN is offline ThokN  Denmark
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Because it is a package of 10 pieces (as I understand it). And those you link to only deliver to UK.
If it's 10 pieces, then I will order them. Then we have some spare for future Boominator-builds.
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Old 6th April 2011, 07:05 PM   #1000
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If you got a friend in the States or Canada now is the time to contact them.

The redesigned original piezos of that I've talked about are available from a US supplier but only to the US and Canada.

HORN BUBBLE TWEETERS 3.5" 10 PACK PIEZO PA DJ (NTX3711) | eBay
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