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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th October 2006, 01:43 AM   #141
anatech is offline anatech  Canada
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I imagine.
 
Old 24th October 2006, 02:41 PM   #142
fredos is offline fredos  Canada
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I can't share schematics...Korean company already make clone of my products, without schematics....I'm a bit scared of that, like a cat pushed in cold water! But if you make some search, you will find schematics of serie 1 model 1200 on this forum!

Fredos

By the way, if you dont use same material and manufacturer as me, you will not get same specs/quality....That was I saw with clone...I have 1 in shop...2 oz PCB when I use 4 oz (that's important specily for the 8000HVI and the 12K HVI), chiness power supply capacitor (already poped with only fews hours of bench test), smaller power resistor, smaller wiring, poor binding post, cheap fans, and unknow power device when I use APT, but they can put it out at 40% of my price, whith same power measurement...Short term, but they got my power...Anyways, whant to see if they can handle a rave at full power!
 
Old 24th October 2006, 04:27 PM   #143
anatech is offline anatech  Canada
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Hi Fredos,
All you need to do is sell one to the wrong guy and it will be copied. That's a sad fact of life. As you say though, different quality.

-Chris
 
Old 24th October 2006, 05:06 PM   #144
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Fredos: " ... I have [a knock off unit] in shop...2 oz PCB when I use 4 oz (that's important specily for the 8000HVI and the 12K HVI) ... [cheap] power supply capacitor (already poped with only fews hours of bench test), smaller power resistor, smaller wiring, poor binding post, cheap fans, and unknown power device ... they can put it out at 40% of my [costs], with same power measurement Short term ... Anyway, want to see if they can handle a rave at full power! ..."

You should post this information on your web site, too. Web page of "cheap knock off" amps that failed ... /failed_imitators.html ...

No need to knock Crown anymore, when you have these poor imitations to kick around ...
 
Old 26th October 2006, 01:07 AM   #145
fredos is offline fredos  Canada
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That's good idea eddy...Will work on this!

Thanks

Fredos
 
Old 27th October 2006, 02:34 PM   #146
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6kW into 4 Ohms.
Bridged 12kW into 8hms...
Not so bad. Means unbridged already something like 155Vrms and roughly 40Arms. Your a devil !!

...looks like... first I have to satisfy my EGO with my own design and in future buy your stuff.... installing 100kW LT corrected subwoofer walls in my living room...

BTW: How do handle the speaker wiring, you are probably not playing around with bridged 310Vrms on open wires. Check for an official approval for your connectors or some envious competitors might try to sue you. Sad but true practice.....
 
Old 27th October 2006, 04:34 PM   #147
fredos is offline fredos  Canada
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Hello ChocoHolic

I use UL/CSA certified 10 gauge speaker binding post that do not accept fork with no user acces to metal. They are rated 500V RMS and flame resistant. Peak output voltage is +/-240V for the 12K, what is far beyond certification limit! And ther is no bridge switch on the amplifier,...No need I think for 12Kw into 8 ohms...You can bridge amplifier by simply use a reverse +/- pin in the XLR input plug...If you really whant to blow your speaker! Output of the amplifier is ground referenced, so their is no probleme to do it, but I really never try it....Fans are already at 90% speed to extend their life, but is easy to modified it for lower noise operation. The only thing is that thermal protection/limiter could be active some time to prevent overheating. But I dont think you can use it full power for long period inside house...I have break basement ciment wall with a crack of about 10 feet in the old shop with this with only 4 18'' speaker...I know that certification is important, I already kick out from Canada some disturbing competition with non compliant products! Business is business!

Fredos
 
Old 27th October 2006, 05:02 PM   #148
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ChocoHolic: " ... installing 100kW LT corrected subwoofer walls in my living room... "

Come on, that's rediculous. That would make your sound pressure levels way above the threashold of pain. What are you building?? A torture chamber??

Chocolate may not be your only addiction ... consider several 12 step programs ...

(But let us all know how it works out ... Fredos: " ... Business is business! ..." ...and consider a military organization as your next customer.)

 
Old 27th October 2006, 11:54 PM   #149
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FastEddy

If you want, I can send you a copy of certification obligation for class d product....That's incredible all the requierment you need to follow to have a certified product!

Fredos
 
Old 28th October 2006, 02:25 AM   #150
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Glad to hear that you have succesfully passed all the annoying path of certification. Congratulation !
...certification is always a world on its own...
Larger companies run entire departments for certification only.

UL/CSA certified 10 gauge speaker binding post:
How do they look, who is sellling that stuff?
May be some informative WEB page?

240V peak, yes that's 155Vrms (220Vp) + some headroom.
And you and handling these voltages and related currents with 500kHz ?!!!!.... and then still at that frequencies you can get a high efficieny?
You are quite some centuries ahead to my kiddi toys....
Eva seems to work on similar power ranges, but I have no idea witch switching frequency she is using.


Fast Eddy:
...just joking about my living room. I have just two small sub cubes 40cm x 40 cm x 34cm. .. each with one Sadhara driver (12 inch). Currently I am powering them with my old 8x150W monster, which I can parallel + bridge up to 1200W into 2 Ohms... But I want to integrate a class D amp into the cabinets....
 

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