Ok, so I have a 3886 amp that I have built, and everything is wonderful so far. Sound quality is excellent. The only problem I have found is that when you put your ear up to the speaker, you can hear a little bit of noise. There is some hiss, some 60 Hz hum, and some rapid ticky noise. It's low... probably wouldn't notice unless you were looking for it, but I want it gone.
I knew that I would have to perform some experimentation with grounding schemes to finalize the assembly, but I don't want to connect something that shouldn't be connected.
So here's a list of everything I have been considering connecting to a star-ground:
- The gnd input (between the AC inputs) on the power supply board
- The gnd output (between the +V and -V outputs) on the power supply board
- The green wire coming in from the power mains
- The metal chassis the amp is built in
- The aluminum heatsink the chips are bolted onto
- The neutral wire coming in from power mains which is connected to two of the transformer primaries
- Two of the wires coming out from the transformer secondaries (which go to the gnd input of the power supply board)
- The shielding of the RCA input connectors
- The "ground" next to the "out" on the amp pcbs which goes to the speakers
- The ground input between the +v and -v inputs of the amplifier pcbs
So, what should be connected? None? Some? All?
I knew that I would have to perform some experimentation with grounding schemes to finalize the assembly, but I don't want to connect something that shouldn't be connected.
So here's a list of everything I have been considering connecting to a star-ground:
- The gnd input (between the AC inputs) on the power supply board
- The gnd output (between the +V and -V outputs) on the power supply board
- The green wire coming in from the power mains
- The metal chassis the amp is built in
- The aluminum heatsink the chips are bolted onto
- The neutral wire coming in from power mains which is connected to two of the transformer primaries
- Two of the wires coming out from the transformer secondaries (which go to the gnd input of the power supply board)
- The shielding of the RCA input connectors
- The "ground" next to the "out" on the amp pcbs which goes to the speakers
- The ground input between the +v and -v inputs of the amplifier pcbs
So, what should be connected? None? Some? All?