A first guide member and a second guide member guide a recording medium into a nip between a transfer member and a nip-forming member. The electronic sketch pad and auxiliary monitor slides under or attaches to the computer keyboard and is used as an auxiliary monitor to the primary CRT monitor. A speed sensor detects movement speed of an objective lens; and a speed control circuit generates a voltage for controlling the objective lens, based on the detected movement speed. A plurality of bonding pads is formed on the active surface of a chip. The system is advantageously portable for use in diverse environments and operable using a variety of power sources from solar to conventional fuels or electricity. In addition, embodiments perform filtering solely in the current domain, thereby eliminating the non-linear voltage-to-current conversion used in conventional circuits and enabling highly linear filtering.