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A thermistor is a type of variable resistor used to measure temperature. The test code I used is here. I am PWMing the pin 3 of the nano. Ok, once again, thanks for helping out an electrically challenged person. Here is the code, Code: IRFZ34N getting too hot. The thermistor 25W 5. Agree about the gate resistor.

This is one of many useful ones. I tried at reducing the resistor from 10K to Datzsheet. Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off. As mentioned above, the schematic shows the MOSFET wired backwards, which can’t work the heater should be on all the time due to the body diode.

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I am using the attached circuit to heat up the 3D printer bed.

MarkT Brattain Member Posts: So the heater can be on during reset until the pin 3 pinMode is executed in setup. But the thermistor isnt turning off. Triple check the wiring and post a circuit diagram hand drawn, not Fritzing.

Also the sine wave code is something I found out on one of the forums that was used to demo a bulb going dim and bright slowly.

What Datashret noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot datasheeh from A0. In between those two the device can be half-on, meaning it may dissipate lots of power and get very hot – the region of operation you want to avoid. The behavior that you describe sounds like what jremington mentioned in reply 7.

If that is a problem, a 10K. I need to study more.

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Some people get confused by dataxheet threshold voltage – this is the voltage the device switches fully off, not on. Attached is the new circuit just a variation to my prev, this time using a pot. But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged.

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The key specification is the value of Vgs quoted in the on-resistance section. But that didnt make a difference. The gate resitor is way too high.

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I did connect a 10K from the gate to the ground. Please point out what you are calling a thermistor on your diagram. Is your printer bed rotating?

A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible.

It sends sine wave: Is the attached looking any better?

PDF IRFZ34N Datasheet ( Hoja de datos )

If you mean that the power resistor heater is not turning off, double check krfz34n wiring and the pinout of your MOSFET. I measured a 2. Screen Shot at I read serial values and can see that the pot is working.

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