Control Systems — question 2 of 10
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You're closing a temperature control loop: a heater's drive signal is generated by comparing a thermistor voltage to a setpoint voltage. The moment you power it on, instead of settling near the setpoint, the heater slams to full power and the measured temperature just keeps climbing until you cut the supply. What's the most likely wiring mistake, and why does that specific mistake produce a runaway instead of just a slightly-off setpoint?