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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th March 2014, 01:34 PM   #4821
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Join Date: Jun 2005
Location: Copenhagen, Denmark
Cinnamon snails they're called here. There's no bakers here that don't have those. It's a very traditional danish pastry. We typically eat them on Wednesdays (as they are made in a bigger variety than normal for the same price on Wednesdays).
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Old 30th March 2014, 07:03 PM   #4822
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The next stage of my Boominator upgrade is done.
2 X Maxamp and DSP, Amazing results!
My Boominator now sounds like I always wanted it to.
Big thanks Wesley and of course Saturnus.
Super loud, clear and pumping!!Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
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Old 31st March 2014, 02:50 AM   #4823
aterren is offline aterren  United States
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Location: Greenwich, CT
Does anyone have a rough weight on the Monacore SP60 ? I'm trying to determine how practical it is for colleague to bring 8 or 12 in his suit case when vists the USA in a few weeks.
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Old 31st March 2014, 05:38 AM   #4824
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Default SP60 weight

0.7kg
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Old 31st March 2014, 08:17 AM   #4825
Feelix is offline Feelix  Australia
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Quote:
Originally Posted by lutkeveld View Post
0.7kg
Box is 11x11x6 cm
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Old 31st March 2014, 02:38 PM   #4826
aterren is offline aterren  United States
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Thanks! I might even have him bring a dozen.
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Old 1st April 2014, 12:24 PM   #4827
WesleyK is offline WesleyK  Netherlands
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Quote:
Originally Posted by Shortrope View Post
The next stage of my Boominator upgrade is done.
2 X Maxamp and DSP, Amazing results!
My Boominator now sounds like I always wanted it to.
Big thanks Wesley and of course Saturnus.
Super loud, clear and pumping!!Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
Looks great . I'm glad you like the results!
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Old 2nd April 2014, 03:08 PM   #4828
aterren is offline aterren  United States
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Join Date: Mar 2008
Location: Greenwich, CT
Folks, I am looking into bringing a number of Monacore SP60 drivers into the USA. How much interest would there be at roughly $30 each? I would need at least 15 people to commit to buying 4 drivers. The price could change with more volume and as I finalize shipping and customs costs.
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Old 2nd April 2014, 05:43 PM   #4829
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Join Date: Jun 2013
Location: Malmo, Sweden
Hi guys.
I have a few questions for you.

Because of the size and orientation of my battery I dont have a bunch of available space for switches, etc. on the exterior of the mini v2.

So have been looking at rotary switches. I want one that is long enough thread to fit through the 6mm (maybe 6.5mm) ply.
A lot of the specifications refer to 120v AC or 250v AC.
How does that correlate to DC at 13v? (like .125A @ 250v)

Also with the bluetooth module using so little power is it worth switching off when not being used? (when the main power switch is on)

I will put a 12v to usb adapter inside. Does that draw much when nothing is plugged into it? (And what would the draw be with a modern smart phone when charging)

I know that the whole point of these systems is efficiency so it seems a shame to waste power but if its a negligible amount it would save space/money and be more cosmetically sound to keep it simple.

And does anyone know how much the maxamp draws?
(Mine arrived today WesleyK, thanks. Its really small and def looks the part compared to my old Ta2020!)

Thanks in advance
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Old 2nd April 2014, 06:44 PM   #4830
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Join Date: Jul 2012
Switches with a higer voltage rating just provide better isolation. The current ratings will be the same fot 220V or 12V. So a switch rated for 125mA at 230V, is also only rated for 125 mA at 12V.

The 12V USB adapter quiescent current will depend on the adapter. Normally it's not very big, but I would personally still turn it off. The draw of the adapter will also depend on the adapter. If it's an efficient switching converter, you can calculate the current draw like this: (5V * charging current) / (12V * 0.90). So a smartphone with a 1 amp charging current (at 5V) will draw 463 mA at 12V using a 90% efficient adapter.

Haven't got an idea about the current daw of the maxAmp though.
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