2oldman wrote:
Made my own from perforated L iron.
While that can be made to work, iron and steel have a much higher resistance for the same equivalent size, thickness and length of copper.
Auto manufacturers often employ multiple grounding points along the chassis and frame in order to cut costs of manufacturing since there is considerably more steel involved the resistance isn't as much of an issue but in some cases the difference in ground potential can cause noise issues like a ground loop..
1/2" copper pipe flattened out will have a lower resistance than 1/2"x1/2"x1/8" angle steel.
True story, I was in High School, the "A/V" club ran some wire 200ft from the club room stereo to the cafeteria.. One channel they used 18ga copper speaker wire, the other channel they used 16ga steel wire.. They didn't have enough money at the time to buy wire for both channels so they used some steel wire they got for free somewhere for one channel. Guess which speaker was louder (spooler alert, it wasn't the one with steel wire)..
