Manufactured by GE, the IC3600AOAA1D is a FANUC component for use within the Mark I/Mark II Speedtronic series. Introduced in the 1960s and 1970s, the MKI and MKII have been in use for decades in almost every continent in every kind of environment in temperatures from -50C to +50C. Both the MKI and the MKII have been designed to control the turbine, keep output to within the capability of the unit, sequence the turbine and its auxiliaries during startup, to provide turbine protection during emergency shutdowns, and to monitor system malfunctions. The IC3600 AO1D is designed to function as an Amplifier Control card. Two of its corners have been drilled out. The GE symbol has been marked on its surface along with the code 002/02, with its board ID number, and with codes to identify components. It is numbered by tens from ten to forty under a line of twenty-five pins made of metal. These pins function as a backplane that connects the board to the primary system via wiring. The IC3600AOAA1D is built with five transistors and two potentiometers. The potentiometers used in this board are both trim potentiometers. Three different types of transistors are used for the IC3600AOAA1D. Heat sinks have been fitted around two transistors. Most resistors in the IC3600 AO1D are metal film; however, four large and several small carbon composite resistors have been used. The board uses polyester vinyl capacitors as well as capacitors of other materials.