quote:As with any subjective matter like preference there's not much use discussing about it as we are both wrong and right. I have stressed the inefficient method of deriving 5V from VPP in AMP15 in other threads, but it comes with the ease of using just one transformer. An efficient method would be a switch mode solution, but that would most likely be noisier. It's always a compromise unless you can tell me a better method than a complicated separate supply. This "inefficient" solution wasn't introduced by me by the way, so I'm not in any need to defend it at all...
AMP7 doesn't use this method by the way, it has the same solution as Truepath with PSU1-VR boards. Only with the difference (and many users have endorsed this as a good mod for a Truepath) is that the 5V final regulation takes place ON the mainboard instead of externally. But neither of the aux. voltages are derived from VNN or VPP.
Have you built the AMP7, had a real close look at the design? Or the AMP15?
What use is it to discuss about the efficiency of 50mA supplies on such a powerful amp anyway? The aux supplies use up so little power anyway that the lack of efficiency is still a small percentage of a small percentage of the total power. It's no big deal, so I agree with Jan's solution on the AMP15.
Krilli is right, this discussion does belong somewhere else...
------X-max. can be several meters on any driver, too bad it can be done only once...------
Edited by - V-bro on 27 Apr 2009 15:14:52