Hi all,
I need 8 channels of good, relatively inexpensive mic pres for recording acoustic ensembles.
I'm kicking around the idea of cobbling together a discrete transformerless design to fulfill my requirements. This is a first attempt.
Design Goals
-28 dbm into 600 ohms without crapping out
- -129 EIN or better
-No electrolytic caps in audio path
-Low enough per/channel cost that I can build 8 and later 16 channels affordably
-Subjectively, more "musical"-sounding than the THAT 1510 pre I've built
References
http://groupdiy.com/index.php?topic=1503.msg19054#msg19054
http://groupdiy.com/index.php?topic=1503.msg19125#msg19125
http://groupdiy.com/index.php?topic=2043.msg25439#msg25439
http://www.forsselltech.com/media/attachments/JFETMP1.PDF
http://www.forsselltech.com/media/attachments/SMP2a_Manual_2.pdf
https://seventhcircleaudio.com/assets/C84/C84R20/docs/c84_sch-b209514dbb74ee164b11fd0d30a0f9b2.pdf
https://seventhcircleaudio.com/assets/T15/T15R15/docs/t15_sch-c400cbbe662173dcbe6005982cb3d4cb.pdf
I need 8 channels of good, relatively inexpensive mic pres for recording acoustic ensembles.
I'm kicking around the idea of cobbling together a discrete transformerless design to fulfill my requirements. This is a first attempt.
Design Goals
-28 dbm into 600 ohms without crapping out
- -129 EIN or better
-No electrolytic caps in audio path
-Low enough per/channel cost that I can build 8 and later 16 channels affordably
-Subjectively, more "musical"-sounding than the THAT 1510 pre I've built
References
http://groupdiy.com/index.php?topic=1503.msg19054#msg19054
http://groupdiy.com/index.php?topic=1503.msg19125#msg19125
http://groupdiy.com/index.php?topic=2043.msg25439#msg25439
http://www.forsselltech.com/media/attachments/JFETMP1.PDF
http://www.forsselltech.com/media/attachments/SMP2a_Manual_2.pdf
https://seventhcircleaudio.com/assets/C84/C84R20/docs/c84_sch-b209514dbb74ee164b11fd0d30a0f9b2.pdf
https://seventhcircleaudio.com/assets/T15/T15R15/docs/t15_sch-c400cbbe662173dcbe6005982cb3d4cb.pdf