05.03.2013, 17:08
(Dieser Beitrag wurde zuletzt bearbeitet: 05.03.2013, 17:26 von TriplePower.)
Hallo,
ohne irgendwem was madig machen zu wollen oder das klangliche Ergebnis (welches ich gar nicht kenne) schlechtreden zu wollen, hier noch eine interessante Stellungnahme von Cristi (connexelectronic) bzgl. der L15D, L-20D... Boards:
IRS2092 alternatives
.
.
.
.
If you gonna chose any other vendor products, I can only suggest to chose Hypex nCore. I do not have them or listened any of them, but I trust Bruno's skills and I believe he's the one who can do something really impressive. The next would be only HIFiMeDiy, but I guess IRS2092 still sound better.
Other vendors such as Sure or L15, L20 I wouldn't even bother to consider, even if would cost 1$. They are made of either fake, either dismatled components, see the attached close-up view (and you can search more on the forum from user's posts) where you can clearly see the IRFI transistor is grinded and laserprinted, then the output inductor have no marking, is a cloned version of the original sagami which is a very good inductor. the fake one is geeting hotter because of cheaper core material which exhibit higher losses and poorer linearity, and also much lower saturation current. If the fake inductor and transistors is used, he THD curves copy-pasted from datasheet of IRaudamp 7 have nothing to do with the reality, as the most important components are out of specs. these boards features no over-voltage or under-voltage protections, and no over-temperature protection, which I consider that even the cheapest amplifier ever must feature them otherwise will become useless after first shortcircuit or overtemperature. the output capacitors used is the wrong type, used for EMI filters, and has larger ESL than the correct ones which of course cost more. the board layout is terrible for a class D amplifier, single layer, no copper pour, with huge GND loops which will generate a lot of EMI, and will suddenly blow up when you less expect this due to overvoltage spikes associated with poor layouts.
Note that most ebay sellers do not offer warrany or offer for an extra ~8 usd, no tracking number for shipping, or add few usd, so the overall price if you chose all these option is close to 25-30 usd. At a similar price I can offer this board Connexelectronic
which is much more decently designed and built, use only genuine components, have all the protections which the cheap boards lack of, continuous copper plane on top layer, large output inductor for higher saturation current, offering better linearity, and the size is just a fraction, 35x95mm and 35mm tall.
I have sent some boards for test to a PA company and they will send me the full test report including THD graphs measured with Audio-Precision system two, and as soon as I will get them, I can complete the manual and include the real measurements too, not copy-pasted from IRaudamp manuals, which are totally different than the real one if different parts and layout is used.
Quelle: http://www.diyaudio.com/forums/connexele...les-5.html
ohne irgendwem was madig machen zu wollen oder das klangliche Ergebnis (welches ich gar nicht kenne) schlechtreden zu wollen, hier noch eine interessante Stellungnahme von Cristi (connexelectronic) bzgl. der L15D, L-20D... Boards:
IRS2092 alternatives
.
.
.
.
If you gonna chose any other vendor products, I can only suggest to chose Hypex nCore. I do not have them or listened any of them, but I trust Bruno's skills and I believe he's the one who can do something really impressive. The next would be only HIFiMeDiy, but I guess IRS2092 still sound better.
Other vendors such as Sure or L15, L20 I wouldn't even bother to consider, even if would cost 1$. They are made of either fake, either dismatled components, see the attached close-up view (and you can search more on the forum from user's posts) where you can clearly see the IRFI transistor is grinded and laserprinted, then the output inductor have no marking, is a cloned version of the original sagami which is a very good inductor. the fake one is geeting hotter because of cheaper core material which exhibit higher losses and poorer linearity, and also much lower saturation current. If the fake inductor and transistors is used, he THD curves copy-pasted from datasheet of IRaudamp 7 have nothing to do with the reality, as the most important components are out of specs. these boards features no over-voltage or under-voltage protections, and no over-temperature protection, which I consider that even the cheapest amplifier ever must feature them otherwise will become useless after first shortcircuit or overtemperature. the output capacitors used is the wrong type, used for EMI filters, and has larger ESL than the correct ones which of course cost more. the board layout is terrible for a class D amplifier, single layer, no copper pour, with huge GND loops which will generate a lot of EMI, and will suddenly blow up when you less expect this due to overvoltage spikes associated with poor layouts.
Note that most ebay sellers do not offer warrany or offer for an extra ~8 usd, no tracking number for shipping, or add few usd, so the overall price if you chose all these option is close to 25-30 usd. At a similar price I can offer this board Connexelectronic
which is much more decently designed and built, use only genuine components, have all the protections which the cheap boards lack of, continuous copper plane on top layer, large output inductor for higher saturation current, offering better linearity, and the size is just a fraction, 35x95mm and 35mm tall.
I have sent some boards for test to a PA company and they will send me the full test report including THD graphs measured with Audio-Precision system two, and as soon as I will get them, I can complete the manual and include the real measurements too, not copy-pasted from IRaudamp manuals, which are totally different than the real one if different parts and layout is used.
Quelle: http://www.diyaudio.com/forums/connexele...les-5.html
TEAC UD-505; Marantz TT-15S1; Ortofon 2M Bronze; 2Pi Phono; Audio-GD NFB-28; WIIM PRO Plus; Audio-GD Precision3; Sure AA-AB32511 Hexfet 2x500W ; GHX_Amp; L20.5; Abletec ALC0300-1300;; LS: "Italian Stallion" & "Albany";
