The OBM-2 output booster/buffer module allows an MTP-9 MIDI-to-parallel circuit to switch 16 loads of up to 500 mA each at up to 35 Volts, inductive or resistive in open-collector (pull-down) configuration. Connection is by industry-standard IDC headers which can link to the MTP-9 using 20-way flat ribbon cable. The power connection is made by high quality risig-clamp screw terminals. No soldering is required for any connections. The circuit is supplied as a single high quality glass fibre PCB measuring 81 x 41mm with four 3.2mm holes for mounting.