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Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off. I did connect a 10K from the gate to the ground. I read serial values and can see that the pot is working.

But the thermistor isnt turning off. Agree about the gate resistor. Please point out what you are calling a thermistor on your diagram. I am PWMing the pin 3 of the nano.

IRFZ34N getting too hot. The gate resitor is way too high. Is your printer bed rotating?

IRFZ34N datasheet & applicatoin notes – Datasheet Archive

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. But when I connect the 19V, the values start floating wildly, irdz34n thats probably why the thermistor started smoking before Datasheey unplugged. Ok, once again, thanks for helping out an electrically challenged person. If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of irfx34n MOSFET.


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

But that didnt make a difference. The test code I used is here. Here is the code, Code: What I noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot read from A0. Some people get confused by the threshold voltage – this is the voltage the device switches fully off, not on.

As mentioned above, the schematic shows the MOSFET wired backwards, which can’t work the heater should be dtasheet all the time due to the body diode. The key specification is the value of Vgs quoted in the on-resistance section.

IRFZ34N getting too hot

Attached is the new circuit just a variation to my prev, this time using a pot. 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. So the heater can be on during reset until the pin 3 pinMode is executed in setup. I measured a 2. This is one of many useful ones. The thermistor 25W 5. I need to study more. The behavior that you describe sounds like what jremington mentioned in reply 7.


A thermistor is a type of variable resistor used to measure temperature. I tried at reducing the resistor from 10K to Ohm.

PDF IRFZ34N Datasheet ( Hoja de datos )

Screen Shot at It sends sine wave: Triple check the wiring and post a circuit diagram hand drawn, not Fritzing. Is the attached looking any better? I am using the attached circuit to heat up the 3D printer bed.

If that is a problem, a 10K.