I am a complete newb at making electronics. I'm looking to build the "copy" of the Gaincard amplifer and power supply at Mick Feuerbacher Audio Projects I have a question re the mute function. Does that need a mute switch, or does it automatically kick in when the current (?) drops below a certain strength?
Probably to increase current handling. Depends on the pad and bond-wire configuration in the leadframe. If the datasheet shows 1 and 5 commoned, common 1 and 5.