Ultimate preamp IC ?
Now I'm convinced by power chip amps, I'm willing to add a buffer to my bridged LM4780 amp.
The bridged mode has a quite low input impedance, <1kohm on one of my amps, and I feel like my soundcard doesn't give its best through such a load.(it is a **** laptop soundcard, but I will replace it with a TransitUSB)
Anyway, I was wondering : what would be the best ICs (semiconductors, not valves) to drive my LM4780 ?
I have found the Analog Devices AD797 to be an excellent choice :
- 0,9nV/Hz input noise
- 25µV offset, allowing a output-capacitor-less design
- -120dB distorsion through 1kohm@1kHz
But I didn't see any well documented DIY preamp using it, so I'm wondering it there was anything better to drive chip amps.
Is there anything better than it ? I know carlosfm likes the AD815, and a french shop sells a preamp based on the AD825.
There are also opamps from Burr-Brown like the OPA2604, which seems to be liked very much also.
Any comment ?