oneoldude
Member
ronv,
The LM833N datasheet says, and I quote, "The LM833-N is internally compensated for all closed loop gains and is therefore optimized for all preamp and high level stages in PCM and HiFi systems."
I guess that means that we do not have to deal with the phase and amplitude nasties found in the LT1115. I suspect we could go without any caps on the feedback resistors. But I put some 22p on anyway. You know, belt and suspenders. What do you think?
Since I have decided to go with a regulated supply, I hope the simple voltage divider at the MIC will do the job. It supplies 8.2V to bias the MIC. What do you think?
The FR curve looks very good. Straight as a string from 10 to 40K Hz. Only need 20 to 20K, but what the heck. It looks good.
I finally figured out how to get polarized caps on the schematic. Will you check the cap polarity to be sure I got it right?
Is the gain spread between the stages where it should be?
Any improvements you can think of?
I really thank you for all your help with this. I hope it has not been too boring for you.
Below is a pic and I have also included the LTS file if you want to give it a try.
Thank you.
The LM833N datasheet says, and I quote, "The LM833-N is internally compensated for all closed loop gains and is therefore optimized for all preamp and high level stages in PCM and HiFi systems."
I guess that means that we do not have to deal with the phase and amplitude nasties found in the LT1115. I suspect we could go without any caps on the feedback resistors. But I put some 22p on anyway. You know, belt and suspenders. What do you think?
Since I have decided to go with a regulated supply, I hope the simple voltage divider at the MIC will do the job. It supplies 8.2V to bias the MIC. What do you think?
The FR curve looks very good. Straight as a string from 10 to 40K Hz. Only need 20 to 20K, but what the heck. It looks good.
I finally figured out how to get polarized caps on the schematic. Will you check the cap polarity to be sure I got it right?
Is the gain spread between the stages where it should be?
Any improvements you can think of?
I really thank you for all your help with this. I hope it has not been too boring for you.
Below is a pic and I have also included the LTS file if you want to give it a try.
Thank you.