Slip ring assemblies transmit voltage/signals to and from rotating, instrumented shafts. The designs include coin silver rings that rotate, a brush block with integral connector or pigtails, and a bearing system to support the rotating components. The brush block and connector assembly are installed in close location to the rings, allowing the brushes to contact the rings. As the rings rotate the stationary brushes remain in contact with the rings, and the signals are transmitted to and from the rotating instrumented shaft and the stationary connector.