preproman
Headphoneus Supremus
- Joined
- Mar 16, 2011
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Why not add the second PSU?
correct, but is possible one sigma22 for 4 boards, right?
I don't think there is any reason to isolate the transformer in an isolated aluminum chasis inside of the main enclosure. Aluminum won't provide any EMI sheilding at all. I think it would be a better idea to just build this as a one case solution using the single case wiring scheme. The IEC inlet will not have any electrical contact with the main case and can be grounded to the internal chasis if you really want to. The problem is that even if you ground the IEC ground to the internal aluminum chasis, there is still a chance that a wire leading to that case could come loose and come into contact with the main chasis causing a dangerous situation because it won't be properly grounded.
I hope this makes sense and I could be wrong since I am not an expert, hopefully someone else will weigh in. I did build a 2 channel B22 with a seperate Sigma22 PSU.
I was under the idea aluminum is a very popular material for shielding though? The aluminum box should be preventing EMI leak from the transformer is what I was led to believe.
The issue is that the IEC inlet contacting the outer main body of the amp is not my choice. The flange mount forces the metal body of the IEC inlet to make contact. I'll double check once it's actually mounted to make sure that's the case. However, that means grounding it to the inner transformer box isn't an option.
I do have the components for the ground loop breaker on hand, but I don't quite understand why I need to use it with my set up.
Sorry, I'm not trying to be difficult. I'm just trying to clarify things before rushing ahead.
I also have a cookie tin and no shame if it really comes down to using 2 chassis.
hahaha.
Why not just do a 6 channel? xD
http://www.head-fi.org/t/669613/fs-rockhopper-6-channel-beta22-amplifier-price-drop