mizterbob
New Head-Fier
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- Aug 15, 2001
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I am planning to build a meta42 and a linear psu for it. A few questions:
1. The meta42 PCB can be used with a TLE2426 rail splitter for virtual ground. However, if I build a psu, I could just make the psu have positive, negative, and ground connections so the rail splitter would be unnecessary. Which is better (with rail splitter or without)?
2. I will probably use a metal case which will be connected to the mains ground. Many psu designs use a ground loop breaker to also ground the signal ground. But many people build battery or wall-wart powered amps, so it doesn't seem that the signal ground needs to be connected to the actual earth ground. So what is the purpose of connecting the signal ground to the mains ground at all (even through a ground loop breaker)? Also, looking at schematics of the ground loop breaker, it seems that if a live wire somehow came into contact with the metal chassis then the mains voltage would be able to enter directly into the amp circuit through the signal ground to mains ground connection, possibly blowing up amp/headphones etc. Is that true? So ultimately the question is, is it better to connect the signal ground to the mains ground or not? Or if I made DIY interconnects I could connect the shield to mains ground and still have a floating signal ground. Would that be a worthwhile solution?
3. This is actually unrelated to the psu, but if I were to make interconnects, is there a minimum length? I would figure it would be best to make the interconnects as short as possible but I think I remember reading that if they're too short there can be problems. Anyone have advice on this?
Thanks for your help on all these questions.
1. The meta42 PCB can be used with a TLE2426 rail splitter for virtual ground. However, if I build a psu, I could just make the psu have positive, negative, and ground connections so the rail splitter would be unnecessary. Which is better (with rail splitter or without)?
2. I will probably use a metal case which will be connected to the mains ground. Many psu designs use a ground loop breaker to also ground the signal ground. But many people build battery or wall-wart powered amps, so it doesn't seem that the signal ground needs to be connected to the actual earth ground. So what is the purpose of connecting the signal ground to the mains ground at all (even through a ground loop breaker)? Also, looking at schematics of the ground loop breaker, it seems that if a live wire somehow came into contact with the metal chassis then the mains voltage would be able to enter directly into the amp circuit through the signal ground to mains ground connection, possibly blowing up amp/headphones etc. Is that true? So ultimately the question is, is it better to connect the signal ground to the mains ground or not? Or if I made DIY interconnects I could connect the shield to mains ground and still have a floating signal ground. Would that be a worthwhile solution?
3. This is actually unrelated to the psu, but if I were to make interconnects, is there a minimum length? I would figure it would be best to make the interconnects as short as possible but I think I remember reading that if they're too short there can be problems. Anyone have advice on this?
Thanks for your help on all these questions.