On Thu, Mar 29, 2012 at 02:27:42PM +0200, Adrian Knoth wrote: > Yes, ADA8000 is based on Alesis (now WaveFront Semiconductors) A/D > (AL1101), D/A (AL1201), an ADAT encoder (OptoGen AL1401) and an ADAT > receiver (OptoRec AL1402). > > The ADA8000 is a copy of the RME AEB8-I (I had the scheme for it if you > want), and the scheme is simply an expansion to 8 channels (instead of > 2) of the appnote given by Alesis for OptoGen and OptoRec.
Which (the appnote) does not include the mic preamp. Strangely enough the ADA8000 preamp has a very good noise figure if used at maximum gain (real max, not just close). It gets very bad once gain is reduced. That is due to *bad design*, you can predict this (without even doing any calculation) by just looking at the circuit diagram. And the line input is just an attenuator feeding the mic preamp. I don't think all that is a copy of anything RME. Apart from that, 50,150,250 Hz hum levels increase from left to right (i.e. as you get closer to the power supply). Which gets hot enough to fry some eggs if you take 5 mA of phantom power from each input. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
