The common perception is to use LOD to bypass the amplifier, and that the signal is sent directly from the DAC.
The TeraDak has "passive I/V" and the
Lite-Dac AH uses AD847, one uses op-amps - the other doesn't - so no I still don't get it...
the common perception is wrong...
the teradak is compromised IMO, it is designed for tweakers, with plenty of space so they can install huge film caps and boutique resistors where a proper output stage should be =) i'm of the opinion that while you can make something half decent if you basically replace everything in it, there is no water into wine. as TDA's go, this chip is entry level only and the PCB layout, particularly the digital and power supply section is ....not ideal.
you cannot build that type of thing point to point with patch wires and expect high performance, if you want a decent dac, build or buy a decent dac from the ground up. some designs are basically good designs that could use a bit of a helping hand, but the layout, parts choice and grounding of this simply cannot be undone. sure its a bit of fun and some people have done some interesting things with these dacs, but there is a point where the layout itself hampers efforts.
yes i'm opinionated, some will disagree with my view, but dacs, particularly these days of higher speeds are more akin to RF than standard analogue, so are quite sensitive to layout issues /rant