Hello everyone! Mi name is Enrique Spinelli. I have been working for many years on analog instrumentation circuits, mainly focusing on biopotential amplifiers. Currently, as a hobby, I am starting with low-noise balanced microphone preamps. I don’t have much experience in this area, but I hope to take it through this forum... I believe that some of my circuit designs could be adapted for audio applications. Best regards!
Hi Dave! They are amplifiers for biomedical signals such as electrocardiograph (ECG), electroencephalogram (EEG) signals. They are ac-coupled and require high CMRRs (like balanced audio circuits...) Herein I attach an ECG amplifier circuit that I think could be useful for audio signals by just changing opamps (2xOPA2211?).
The design equations for setting the gain and the low and high cut-off frequencies can be found at:
https://www.techrxiv.org/users/6836...tial-amplifier-with-a-reduced-number-of-parts
The design equations for setting the gain and the low and high cut-off frequencies can be found at:
https://www.techrxiv.org/users/6836...tial-amplifier-with-a-reduced-number-of-parts
