A ramp wave output circuit includes a ramp wave generation circuit generating a ramp wave, and a low-pass filter having a variable cutoff frequency, which receives the ramp wave. At opposite ends of the stack body in a stacking direction, end plates are provided. The first and second semiconductive bodies are electrically isolated from each other. The method further includes causing delivery of the customer-specified color and quantity of containerized liquid coating to the delivery address in accordance with the plurality of inputs. An export API may also be implemented to export data to create a hierarchically structured document, such as an XML file. The electronic processing system includes red and green LEDs which are alternately pulsed or energized over predetermined periods of time to determine if fluid test results show a marker or markers in the capture region indicative of the presence of a preselected analyte in the fluid.