Quote:
Originally Posted by Alan Anderson
You can't exceed the desired voltage from a properly operating passive circuit. However, it's not a fail-safe. You can't ignore the potential loss of the ground connection going to the bottom of the resistor ladder, or the potential shorting of the "top" resistor.
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I respectfully disagree. The safety of our robots depend on many
properly operating passive circuits. And this particular passive circuit has little to no load. If it works at inspection, it is gonna work forever unless one physically compromises the components. This is true of many passive circuits in FRC robots.
Our resetting breakers are a more complicated passive circuit and we use those to protect many things on the robot. Heck, the power wires running to all our electronics are more complex "lumped" circuits. And an open ground connection results in no controlling voltage and the minimum output pressure. Still the worst fanciful failure imaginable gets you ~70PSI, not 120PSI, as the highest possible potential in the passive control circuit is 5VDC.