Fuses, primary, rails, current limiters and channels?

[rgrayton]

Hey Guys,
Thsi is my first chip amp and torroidal PS (Brian's 4780 kit, but 6 channel). I am using an Avel 800va. I was hoping to fuse each channel, but I am realizing that not so easy, unless you fuse the rails and I am not so sure that is a good idea incase one goes and the other does not. Also, I considering a current limiter in series with the primary fuse -- for 6CH, I was thinking of a 8A current limiter and a 10 amp fuse. What do you guys do for the PS? Thanks for any inputs.
-BG

[Ed LaFontaine]

With regards to fused rails, it's OK. Prof. Leach, for one, does it on the "Leach" Amp.

[rgrayton]

bg,
even if one goes and the other does not? THX,
-BG

[Mr Evil]

That depends on the particular amp. Some topologies will not like it and may swing the output to the other rail, some will be fine. It's a fault condition that is worth testing for when designing an amp.

Whether the chip amp you're using will be alright or not I don't know, but I suspect that it will be fine, since such devices are usually quite robust.

[rgrayton]

Thanks, Mr Evil. I am pretty sure the 4780 has a lot of built in stuff, but I will check on it.
-BG