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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th April 2011, 06:33 PM   #1151
Nahaz is offline Nahaz  Sweden
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Ill buy some if they are indeed better, but right now I want to finish the build in time for this years festival so Ill go with the QLM-1005 for now, and replace them later if the quality is that much better with the original ones.

Saturnus: Did you have a resistor recommendation for the QLM-1005?
QLM-1005 - Ljudia - Multimedia Hemelektronik Karaoke PA anläggning DJ utrustning Ljus utrustning

These:
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Old 25th April 2011, 06:46 PM   #1152
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I think it 33 Ohms that works best with those piezos like the original Motorola ones. Never use wirewound or power resistor with piezos though. Use solid carbon (good luck trying to find those) or metalfilm. Like these: Resistor 0617 3W 5% 33R Taped | RMO3E033 - Elektronik Lavpris ApS
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Old 25th April 2011, 06:58 PM   #1153
Nahaz is offline Nahaz  Sweden
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Need to find suitable resistors in Sweden, the site you linked to takes 30:- for handling and 250:- for shipping.... 4 resistors, thats just insane : )
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Old 25th April 2011, 07:01 PM   #1154
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Quote:
Originally Posted by Nahaz View Post
Need to find suitable resistors in Sweden, the site you linked to takes 30:- for handling and 250:- for shipping.... 4 resistors, thats just insane : )
Yeah, it'd be a lot easier to take the train and pick them up next time you're in Copenhagen to buy beer.

https://www.elextra.dk/main.aspx?pag...e&artno=H13216

Shop is near Nørreport.

Or just PM me your home address and I'll stuff them in an envelope for you and send them tomorrow. You'll just owe me more beer at Roskilde.

Last edited by Saturnus; 25th April 2011 at 07:06 PM.
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Old 25th April 2011, 07:12 PM   #1155
Nahaz is offline Nahaz  Sweden
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If I had time to wait for another Hong Kong shipment I guess these would be suitable?
Find Metal Film Resistor 3W 33 Ohm 1% 5 pcs on eBay International Market, with worldwide deals on items in all your top categories
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Old 25th April 2011, 08:03 PM   #1156
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Hey anyone knows if the SPL on these speakers are remotely true? 10'' bas
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Old 25th April 2011, 08:14 PM   #1157
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It's possible but not likely. And there's no T/S parameters so it's not possible to calculate any suitable cabinet for them.

Please note that they're actually not much cheaper than the HP-10Ws. And those are sublime quality for the price already. You shouldn't look at cheaper alternatives, they'll not be nearly as good.

Last edited by Saturnus; 25th April 2011 at 08:17 PM.
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Old 26th April 2011, 09:22 AM   #1158
chief3 is offline chief3  Denmark
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Hey Saturnus and everyone else.

Me and my roskilde camp are about to begin the building of our own Boominator, but before start ordering the wrong stuff we got a few questions.

1. Best alternative to the Ebay Piezo speakers from ebay which now is sold out.?
2. You said your amplifiers Qbox was tuned to 88 herz, what does it mean and how can we do this (if its even important) we are planning to get the preassembled amp6 from 41. HZ

3. Should we glue the magnets together or should the box tighten them together if you know what i mean.


Best Regards Camp ManhooD
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Old 27th April 2011, 07:25 AM   #1159
rubennn is offline rubennn  Denmark
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Originally Posted by Phaedras View Post
Im using panels from Electrozone.dk.. Its 8v and 5.2w but when serial connected they are perfect..
Those look nice. I have already got that big 92x31.5 cm panel but I'm actually thinking about ordering 2 of these and find good use for the other panel some other time. I should have taken Saturnus' word "don't rush anything".

Anyway - is there anything else between these solar panels? A fuse or diode or something?
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Old 27th April 2011, 07:31 AM   #1160
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Originally Posted by rubennn View Post
Those look nice. I have already got that big 92x31.5 cm panel but I'm actually thinking about ordering 2 of these and find good use for the other panel some other time. I should have taken Saturnus' word "don't rush anything".

Anyway - is there anything else between these solar panels? A fuse or diode or something?
The panels are pretty nice although 4-5 watts lower than the large panel you bought.. However, they are small enough to fit 4 panels on top of the Boominator if thats your fancy

The build quality is very nice and they come without a frame and is only 3mm thin..

Nothing between the panels..
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