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I measured a 2. Attached is the new circuit just a variation to my prev, this time using a pot.

【IRFZ34N IR】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

It sends sine wave: A thermistor is a type of variable resistor used to measure temperature. Also the sine wave code is something I found out on one of the forums that was irz34n to demo a bulb going dim and bright slowly. The test code I used is here.

Please point out what you are calling a thermistor on your diagram. 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. The key specification is the value of Vgs quoted in the on-resistance section. A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible. Screen Shot at I read serial values and can see that the pot is working.


I did connect a 10K from the gate to the ground.

I am using the attached circuit to heat up the 3D printer bed. But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged. I tried at reducing the resistor from 10K to Ohm. Some people get confused by the threshold voltage – this is the voltage the device switches fully off, not on. The thermistor 25W 5.

IRFZ34N getting too hot. Agree about the gate resistor. If that is a problem, a 10K. But that didnt irgz34n a difference. Here is the code, Code: If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET.

(PDF) IRFZ34N Datasheet download

So the heater can be on during reset until the pin 3 pinMode is executed in setup. I need to study more. Is your printer bed rotating? Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off. The gate resitor is way too high. Ok, once again, thanks for helping out an electrically challenged person. This is one of many useful ones.


Triple check the wiring and post a circuit diagram hand drawn, not Fritzing. MarkT Brattain Irf34n Posts: I am PWMing the pin 3 of the nano.

What I noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot read 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.

IRFZ34N – Infineon Technologies

The behavior that you describe sounds like what jremington mentioned in reply 7. Is the attached looking any better?

But the thermistor isnt turning off.

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