Silver is considered one the best electrode materials around. We can capitalize on this by using two U.S. dimes for our electrodes. The cable we’ll use is a shielded 2-conductor. The shielding is a copper braided wire that surrounds two insulated wires in the center of the cable. Remove about 2 inches of the outer cable jacket, and separate the shielding from the insulated wires. Strip ½ inch of insulation off the center wires.