This invention relates to a method and device to produce esterified, olefinatedesterified, or thermochemolytic reacted bio-oils as fuels. The fuel cell stack includes an anode supply chimney for supplying fuel to the anode of each fuel cell cassette, an anode return chimney for removing anode exhaust from the anode of each fuel cell cassette, a cathode supply chimney for supplying oxidant to the cathode of each fuel cell cassette, and a cathode return chimney for removing cathode exhaust from the cathode of each fuel cell cassette. 01 \u03bcm or more or cracks of a depth of 0. The valve actuator assembly further includes an onoff valve in fluid communication with the feedback channel to enable and disable the feedback channel to control motion of the second spool valve. Thus, the lowest energy level data on a non-volatile or pyrolytic molecule or the molecule aggregate of that molecule and a thermally-unstable molecule or the molecule aggregate of that molecule or the like is obtained. A current switching circuit switches between output currents in response to a current control signal from current control means, thereby switching between currents to be supplied from a bias circuit to the operational amplifiers via transistors.