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But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged.

IRFZ34N MOSFET. Datasheet pdf. Equivalent

Please point out what you are calling a thermistor on your diagram. The gate resitor is way too high. Screen Shot at I did connect a 10K from the gate to the ground. Ok, once again, thanks for helping out an electrically challenged person.

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

IRFZ34N getting too hot

I am using the attached circuit to heat up the 3D printer bed. Is the attached looking any better? MarkT Brattain Member Posts: A thermistor is a type of variable resistor used to measure temperature. I need to study more. I am PWMing the pin 3 of the nano. If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET.


Attached is irvz34n new circuit just a variation to my prev, this time using a pot. 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.

PDF IRFZ34N Datasheet ( Hoja de datos )

I measured a 2. IRFZ34N getting too hot. It sends sine wave: Also the sine wave code is something I found igfz34n on one of the forums that was used to demo a bulb going dim and bright slowly. I read serial values and can see that the pot is working. The behavior that you describe sounds like what jremington mentioned in reply 7. Is your printer bed rotating? 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.


Here is the code, Code: If that is a problem, a 10K. This is one of many useful ones.

Agree about the gate resistor. Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off.

The thermistor 25W 5. But the thermistor isnt turning off.

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 test code I used is here.

A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly rifz34n possible. Triple check the wiring and post a circuit diagram hand drawn, not Fritzing.

So the heater can be on during reset until the pin 3 pinMode is executed in setup. I tried at reducing the resistor from 10K to Ohm.