blandman74
Well-known member
Howdy all, I am looking for a little advice on a preamp design. I searched the forum and couldn?t find what I?m looking for so if anyone has ideas, I?d love to hear ?em.
I just participated in a ribbon mic group buy (via www.analogindustries.com) and want to build a simple, transformer-input circuit with an unbalanced output. Talking with Tom (or was it Dave?) at cinemag it was suggested I use a 50-ohm impedance transformer that gets me 22 db of gain off the bat. I figure for the mic I need another 45 dB of gain after that. So I compulsively bought one. I have to stop that.
Anyhoo, I am mostly concerned with making sure I build a preamp that makes the most of my nice (hopefully ? it hasn?t arrived yet) new ribbon mic. Now that I?ve bought the CMMI-7C from cinemag, does anyone have any suggestions for a clean, solid-state preamp design for ribbon mics?
BTW, I plan on taking advantage of the alternate primary wiring (a 200-ohm primary) and just have a little switch to toggle between either primary. Will this toggle switch affect noise so much that it would impact the design?
PS I looked at this design:
www.groupdiy.com/index.php?topic=8626
which is a Walt Jung design, but I am afraid it does not afford enough gain (total of 50 dB, maybe a touch more with the cinemag) to be useful with my ribbon mic.
Any advice is appreciated!
I just participated in a ribbon mic group buy (via www.analogindustries.com) and want to build a simple, transformer-input circuit with an unbalanced output. Talking with Tom (or was it Dave?) at cinemag it was suggested I use a 50-ohm impedance transformer that gets me 22 db of gain off the bat. I figure for the mic I need another 45 dB of gain after that. So I compulsively bought one. I have to stop that.
Anyhoo, I am mostly concerned with making sure I build a preamp that makes the most of my nice (hopefully ? it hasn?t arrived yet) new ribbon mic. Now that I?ve bought the CMMI-7C from cinemag, does anyone have any suggestions for a clean, solid-state preamp design for ribbon mics?
BTW, I plan on taking advantage of the alternate primary wiring (a 200-ohm primary) and just have a little switch to toggle between either primary. Will this toggle switch affect noise so much that it would impact the design?
PS I looked at this design:
www.groupdiy.com/index.php?topic=8626
which is a Walt Jung design, but I am afraid it does not afford enough gain (total of 50 dB, maybe a touch more with the cinemag) to be useful with my ribbon mic.
Any advice is appreciated!