Talking classical. SCA T15, C84, J99: which to pick?

[SeventhCircle]

Which do you think could be the fittest for my use?

Definitely the C84. The other modules cannot match the noise and headroom numbers. If you have a compelling need for transformer isolation, I recommend the J99b over the standard J99 because the simplified circuit and integrated layout improves noise by about a dB. If you buy a C84 kit, be prepared to solder SOIC-14 packages.

did anybody use them on batteries and solved the problem of getting 48V phantom power?

Current draw is substantial and battery life will be minimal, plus you'll need +/-30V to get maximum headroom. Mains power is recommended. If you must use battery power, the best choice is the T15 modified to run on +/-15V.

[beccogiallo]

Thanks for your fast and thorough reply!

Originally Posted by SeventhCircle

Current draw is substantial and battery life will be minimal,

Can you please give a figure for current draw? (T15 and C84) Current requirements specifications on your site are empty for both modules.

plus you'll need +/-30V to get maximum headroom

I'm a bit confused. I read +/-20V in T15 assembly instructions, and in C84's stays written "adjust R64 and R68 for +18V at +B and –18V at -B. If you need more headroom, the OPA2604s will withstand as much as +/-24V".

If you must use battery power, the best choice is the T15 modified to run on +/-15V.

I suppose that for "modified" you mean its voltage regulators have to be set (resistors/pots) for +/-15V?