Hello I am looking for a subwoofer amplifier scheme Nubert AW 850. Can someone have such a scheme? Thank you in advance
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Hi, I had a similar problem with a AW 1000. Could you show us the whole PCB? I've reverse engineered the PCB. Maybe you can also use it for the AW 850. Beitrag "Nubert AW 1000 Endstufe abgebrannt; Ruhestrom" Apparently those Nubert amp modules burn up quite often...
Luca E. wrote: > Hi, > > I had a similar problem with a AW 1000. Could you show us the whole PCB? > I've reverse engineered the PCB. Maybe you can also use it for the AW > 850. > Beitrag "Nubert AW 1000 Endstufe abgebrannt; Ruhestrom" > > Apparently those Nubert amp modules burn up quite often... Hello I added some PCB photos Some elements are the same
Looks quite similar. My amplifier module even had the same blown capacitor ;-). I've replaced the whole module. That's the easiest and safest way to repair the subwoofer. It would probably burn up again if you manage to repair it with the same parts.
Hello, this PCD looks really burned (out). Although thats' only the case at some small areas, that's really bad... you'd have to cut out the coaled PCB base material wholly, and don't you dare to forget a little bit of it - that material tends to conduct current, just like coal for heating, or like some metals. I'd not use this PCB any more, but eventually other users do know other ways to handle that. My choice would be making a whole new PCB or switch to class d.
mudman wrote: > My choice would be making a whole new PCB or switch to class d. But use a different circuit instead. Class D would be appropriate these days.
Luca E. wrote: > Looks quite similar. My amplifier module even had the same blown > capacitor ;-). > I've replaced the whole module. That's the easiest and safest way to > repair the subwoofer. It would probably burn up again if you manage to > repair it with the same parts. where I can get such a module because it is hard to find
Max 2. wrote: > where I can get such a module because it is hard to find Try this: https://www.google.com/search?q=class+d+amp+module+200w And for example you'll get that: Ebay-Artikel Nr. 111655568658
Luca E. wrote: > Class D would be appropriate these days. That's right, class D already has many advantages. The days class D was't as good as AB are past. But for subwoofers, even the very first class D amplifiers would have done so, as such low frequencies are far less demanding to reproduce. Today there is not the slightest sensible reason to operate any Subwoofer not with (even with cheap or "bad") class D amps. For fullrange speakers it's slightly different, a DIY amp built from a TL494 as PWM Modulator wouldn't do that right. :) Max 2. wrote: > where I can get such a module because it is hard to find You can't find class D modules with 250 watts at 4 ohms (i think that's the absolute maximum rating of the AW850)? That's impossible. You only have to search for that ones, which work with the symmetrical supply that you have in your active woofer also. (Would be "halfbridge" topology, and "+ xxV / -xxV" could (SHOULD, to see) be mentioned at the article description. Search for some examples (the specified wattage could also be a little higher than 250W, but not too much, and a little lower also, but maybe better not unter 200-220W to get it richt with specified input volts). And present them here - we can tell you, which are good.
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You won't be able to find the exact same module. You could replace the PCB with a Class D module. For example: https://www.soundimports.eu/de/aa-ab32291.html?gclid=CjwKCAjw0N3nBRBvEiwAHMwvNuTwQQ3wJOfzKkXQSfrHtqFvtK-Q9aSoe1nHzECKQBt9pHQLZ54tIRoCZNwQAvD_BwE You need a power supply though. You can either build one based on the components on the current PCB (I did that) or you can buy one. The transformer produces around 62V DC after rectification. I can give you the pinout of the signal connector, if you need further information on that.
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Thank you for the tips. I would like to first fix the amplifier and I would need a schematic. As is the case for the AV1000. If I can not fix it, I will definitely use class D modules