Yes I know these are old and quite ugly, but they work!  Hard to find so I was thinking about fabricating my own.  I know I read an article back in MR some time back on how to do this but have been unsuccessful in researching it on the web.  I don't believe it would be all that difficult using brass tubing and such but I little advice from anybody is welcome.  

Anyways, here is a close up of these ground throws.

Good day, all - I have been experimenting with a wireless method of supplying power to a rotating object. Things like illuminated, rotating signs, turntables, and other kinetic devices sometimes need power. Traditionally we use slip rings and brushes or similar contacts.
These can be troublesome and hard to maintain.

I have come up with a way to use the circuitry that is employed to wirelessly charge a cell phone to supply several watts of DC power to a rotating device.

I have posted details (including a video) here:

I am going to use red/green bi-color LEDs for short-circuit indication for a reverse loop. Using track voltage and 20 ma, I need 560 ohms at 1/4 watts. Do I need to divide the resistance and put half on each leg of the led?

Scott Groff