| http://www.w3.org/ns/prov#value | - Referring now to FIG. 2, each drive output 34 is a circuit generally comprising a comparator 42 (e.g., LMV7235 from National Semiconductor), a voltage regulator, a diode 45, a setpoint potentiometer (POT) 46, a power field effect transistor (FET) 48, and a feedback resistor (RS) 47.
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