Hi all,
Pass Balanced line stage is my first diyaudio project (even my first attempt to solder). I have completed stuffing the board (from audioexpress) and tested it. It was singing (I was excited) but I can't tell its quality yet because I used crappy amp and speaker (Lo-Fi). One question I want to ask is the function of R18 and R19 (221 ohm) at the input. I didn't include them because the board didn't have place for them. Can I simply omit them or they serve some beneficial function?
I have a 10K dual gang potentiometer and would like to put it at the output side although the article stated a 5K pot. I remember Nelson said that you can have some flexibility for the value of pot. Correct me if I'm wrong. By the way, I used single-ended for the time being.
Thank to Nelson for this simple and wonderful project. It really help a newbie like me to start diyaudio and the result is encouraging. Thanks to the diyaudio.com community for their constructive discussion and help too.
Wallace
Pass Balanced line stage is my first diyaudio project (even my first attempt to solder). I have completed stuffing the board (from audioexpress) and tested it. It was singing (I was excited) but I can't tell its quality yet because I used crappy amp and speaker (Lo-Fi). One question I want to ask is the function of R18 and R19 (221 ohm) at the input. I didn't include them because the board didn't have place for them. Can I simply omit them or they serve some beneficial function?
I have a 10K dual gang potentiometer and would like to put it at the output side although the article stated a 5K pot. I remember Nelson said that you can have some flexibility for the value of pot. Correct me if I'm wrong. By the way, I used single-ended for the time being.
Thank to Nelson for this simple and wonderful project. It really help a newbie like me to start diyaudio and the result is encouraging. Thanks to the diyaudio.com community for their constructive discussion and help too.
Wallace
Hi, Wallace
R18 and R19 are there to keep the output stage of whichever source you are using from seeing the zener diodes Z1/Z2 and Z3/Z4. If you don't use the zeners you most likely won't have any trouble without R18 and R19.
Incidentally if you use P1 and P2 for input trim, I would think you could also get by without R18 and R19.
Hope that helps,
Erik
R18 and R19 are there to keep the output stage of whichever source you are using from seeing the zener diodes Z1/Z2 and Z3/Z4. If you don't use the zeners you most likely won't have any trouble without R18 and R19.
Incidentally if you use P1 and P2 for input trim, I would think you could also get by without R18 and R19.
Hope that helps,
Erik
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