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I suppose a PWM control of each transistor (as opposed to on/off) could be used to precisely control the resulting heating power, but a PTC resistor is supposed to self-regulate to a constant temperature? Another clue is the lack of current feedback therefore I think the heating power is simply controlled by switching on/off a combination of the three resistors .


Without an oscilloscope a crude way to check is to set the multimeter to AC and measure the three control lines again.



A quick way to test the resistors is to bypass the transistors altogether, the measured voltage * current should give you the resulting heater power...


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