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What is HASL with lead and why you may prefer it over ENIG

Grounding an audio amplifier - correct signal references
We cannot have any common ground.
Grounding an audio amplifier - current routing
Route any current close to its return, and any signal to its reference.
Grounding an audio amplifier - EMI protection
Connect cable shields to the enclosure to keep EMI out.
Grounding an audio amplifier - electrical safety
