DIY Active Ground Box

I believe you don't need a box if you are connecting the signal grounds to an outlet ground.

If you are using a box by itself to dissipate EMI then make an antenna in a V shape inside the box with a simple banana plug. I fill my boxes with quartz crystals, Rochelle salts, and tourmaline. I use wooden boxes and also have purchased some cylindrical cardboard tubes for the passive devices.

So I use both methods and for the outlet I made a one wire plug for the ground only and a banana jack sticking out the back to make connections from the signal grounds to the plug.

I also use the Ground Master for power grounds onto the Puritan and separate ground rod. I may make a parallel run with another groundmaster for the signal grounds.

I wanted a way to ground the loop spades the cable have. Just letting them sit there dangling, or taping them off or cutting them off was undesirable.

I have enough material to make another one.  I think I will try your backfill recipe. :)

Why copper plating?

Why not Faraday fabric that actually blocks EMI?

@fuzztone 

The idea isn't about blocking EMI.  It's about safely dissipating all collected or excess electrical signal that enters, propagates or is erroneous.

Ok, so the copper plates are simulating the copper grid that is usually created in a house or building ground. It's a highly conductive plane that attracts the electric signal and keeps it trapped there until it dissipates.

 

Well I have a 4 lb piece of CU, transformer buss bar that fits tight in a wooden cigar box. I think that I’d rather use that. Maybe not - all my cases are already bonded to ground.

Glad it works for you.