Samuel Groner
Well-known member
Hi
As St*der has started to publish some schematics, I found this interesting mic pre:
D19_MicAD_Op_Serv47.jpg
Could someone give me a hint as how the first active stage works? It looks to me as if it were an inverting stage and the transformer and the mic set the source impedance and thus the gain. But this cannot be true as this would result in a rather un-flat frequency response, to say the least.
Wait, the transformer is somehow included in the feedback loop; does this contribute to the solution? They seem to switch the turns ratio as well.
Thanks for help!
Samuel
As St*der has started to publish some schematics, I found this interesting mic pre:
D19_MicAD_Op_Serv47.jpg
Could someone give me a hint as how the first active stage works? It looks to me as if it were an inverting stage and the transformer and the mic set the source impedance and thus the gain. But this cannot be true as this would result in a rather un-flat frequency response, to say the least.
Wait, the transformer is somehow included in the feedback loop; does this contribute to the solution? They seem to switch the turns ratio as well.
Thanks for help!
Samuel