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The control cavity: I have shielded comprehensively with good quality conductive graphite paint.
The control cavity cover: is also shielded with copper foil and I’ve ensured electrical continuity..
Interestingly with the pickup selector switch in bridge position I get no buzz when I take my hands off the strings/bridge.
However I get a little more buzz with the pickup selector in the middle position and a lot more buzz with the pickup selector in the neck position.
It’s almost as if the longer cables from the neck pickup are attracting electromagnetic interference...
Is there a simple solution please?
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Replace the wiring to the pickups with shielded cable.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
They’re Kinmans - from Kinman I understand that the hookup cables are screened cables and so are immune to buzz.
They suggest I shield the pickup cavity walls and floors if not already.
But If I paint the floors and walls of the pickup cavities, the 'roof' would still be open right?
Yes, but it will still make a difference. If the bridge pickup isn't buzzy it must be because it's closer to the control cavity shielding. (Remember that the shielding must be connected to the ground elsewhere too, or it won't work.)
*Some* buzz is inevitable with a passive guitar though - that's why the strings need to be grounded, so the player acts as a shield.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
The pickups are two conductor
- ground to volume pot casing
- signal to selector switch
Re: connecting the pickup cavity shielding to ground, looks like I’ll need to connect a wire connecting each pickup cavity and the control cavity. since it’s rear routed with little channels connecting the pickup cavities to the control cavity. That’s going to be really difficult... but I suppose a worthwhile challenge ...
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
For each pickup cavity
- One strip of foil affixed to floor
- Rest of floor and walls painted with graphite paint (overlapping onto foil for electrical continuity)
- A wire soldered to the foil strip and the volume pot
Now she’s dead silent - no buzz when I take my hands off the metal parts.
I was quite surprised since only the floors and walls of the pickup cavities are shielded - they are 'open sky' so to speak...
I thought you’d find that interesting!
So you were right - on rear routed instruments, graphite painting the pickup cavities really helps.
[Imgur](https://i.imgur.com/UdBYTRh.jpg)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein