|Class D Switching Power Amplifiers and Power D/A conversion|
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|8th October 2012, 07:10 PM||#1|
Join Date: Oct 2012
Grounding and shielding in B&O ASP1000 module, help wanted!
Just put together an amp based on the B&O ASP1000 module but I'm slightly confused over the B&O grounding and shielding recommendations.
The module heatsink is screwed directly to the chassis side wall (15mm alu) and bottom (3mm alu).
I will use an SE-input (normal RCA cahssis connector) so VI- will be shorted to AGND on the board.
In the datasheet and designers manual it is stated that the low-level AGND and high-level PGND are shorted and then connected to the heatsink via 10kohm//30nf and that the heatsink is connected to the board power connector earth-pin.
So the signal ground is separated from earth by 10kohm//30nf.
Since I've screwed the heatsink directly to the chassis at multiple points I will have a really low ohmic connection between the modules earth pin and the chassis.
So far so good.... but it is also recommended that the low-level input chassis connector ground should be directly connected to the chassis.
This will mean that earth and signal ground are connected together which seems strange to me.
Two more questions:
- I plan to use shielded power cable and plan to use this internally as well. Is it better to use normal twisted cables with a ferrite than the shielded cable?
- I also plan to use shielded loudspeaker cables (shield connected to PGND), so same question as above?
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