The rules say load cells are construction violations. Are student-constructed load cells (e.g. from strain gauges) allowed? Reveal Questions A student built load cell from basic components like strain gauges is legal. ‹ The rules allow "surface mount adapter boards" but not "daughter boards." Because certain chips are not available in DIP packages, is a PCB that has no other components or circuitry other than connecting the chip to the breadboard considered a "su... The rules say that the input voltage may not exceed 12 volts. Thus, is a 9V dual power supply (+/- 9V) considered illegal? ›