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  • DIY Yihua Soldering Station

    Here you have two possible solutions: one using a PNP transistor (most common) and other using a PNP transistor.The easy one will be using the PNP transistor, as it acts as the original mosfet driver, so you only need to replace the mosfet driver by this circuit and everything will be done. When the MCU signal is HIGH, it will activate the mosfet and the heater will be fed.For the NPN circuit, in addition of change the circuit, you must modify also the program, as now it is an "inverted driver", so every time the MCU is LOW, the heater will be fed, and vice versa. That way, you need to modify the program to also invert the output signal to stand-by at HIGH and activated at LOW.For the base resistor, 1k will draw only 4.3mA from the MCU and will give 215mA approx of emmiter-colle…

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    Here you have two possible solutions: one using a PNP transistor (most common) and other using a PNP transistor.The easy one will be using the PNP transistor, as it acts as the original mosfet driver, so you only need to replace the mosfet driver by this circuit and everything will be done. When the MCU signal is HIGH, it will activate the mosfet and the heater will be fed.For the NPN circuit, in addition of change the circuit, you must modify also the program, as now it is an "inverted driver", so every time the MCU is LOW, the heater will be fed, and vice versa. That way, you need to modify the program to also invert the output signal to stand-by at HIGH and activated at LOW.For the base resistor, 1k will draw only 4.3mA from the MCU and will give 215mA approx of emmiter-collector current.For the pullup/pulldown resistor should be enough 10k with a low power dissipation, as you don't need high switching speed.I hope you understand everything.Don't hesitate to reply if you need more info.

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  • DIY Yihua Soldering Station

    The mosfet-driver is the responsible of supply 12V to the mosfet.Also mosfet-drivers are used to protect MCUs from the high load peaks when activating and deactivating the gate.Of course, the IRLZ44N can be driven by 5V from an arduino pin always you put a resistor between them to protect the MCU from the peaks.The only con is that the lower the voltage, the more heat the mosfet disipate at Drain. (That why I used the 12V from the ATX PSU)The best non-driver-solution will be to use a BJT transistor to drive 12V to the mosfet from the Arduino (using proper resistors) and a pull-down resistor.If you wish, reply me and I can explain how and which values to use.

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  • DIY Yihua Soldering Station

    Sorry for late, I was very busy.I don't know what exactly are you referring to.If you are meaning of the maximum temperature I reached was 550ºC (I did not test it further), and the minimum is the room temperature of course.

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    • DIY Yihua Soldering Station
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