A torque transducer comprises strain sensing means on a torque deformable shaft and slipring means for transmitting the torque signals from the rotating shaft to stationary brush means. The slipring means are annular discs of carbon material, such as sintered graphite, and the brush means are individual strips of flexible metal passing under tension partially around the respective slipring discs. The electrical contact between the strain sensing means and the carbon discs is by means of a number of printed circuit boards each of which has an annular or substantially annular portion with its conductive coating in face-to-face contact with a face of a respective carbon disc. The carbon discs and printed circuit boards being in axial compression on the shaft.