According to one aspect, a drilling rig carriage is adapted to move along a drilling mast, and includes a body structure, electric motors coupled to the body structure, and pinions operably coupled to the electric motors, respectively. The damper weight is made of, for example, steel plate to have a spiral form and placed to surround the inner cylinder, thereby itself functioning as a spring in the direction of the axis. The common gate sense amplifier comprising a current source and a biased metal-oxide semiconductor is applied for sensing the current of the bit line. Additionally included is a processor-implemented reporting component configured to receive a communication from the user identifying content as objectionable within the network-based community.