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Some people get confused by the threshold voltage – this is the voltage the device switches fully off, not on.
But the thermistor isnt turning off. Agree about the gate resistor. The key specification is the value of Vgs quoted in the on-resistance section. So the heater can be on during reset until the pin 3 pinMode is executed in setup.
I measured a 2. Attached is the new circuit just a variation to my prev, this time using a pot. Here is the code, Code: Triple check the wiring and post a circuit diagram hand drawn, not Fritzing. The thermistor 25W 5. The gate resitor is way too high. I read serial values and can see that the pot is working. Screen Shot at 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. I tried at reducing the resistor from 10K to Ohm.
The behavior that you describe sounds like what jremington mentioned in reply 7. I am PWMing the pin 3 of the nano.
Please point out what you are calling a thermistor on your diagram. Also the sine wave code is something I found out on one of datsheet forums that was used to demo a bulb going dim and bright slowly. But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor irf34n smoking before I unplugged. I did connect a 10K from the gate to the ground.
This is one of many useful ones. But that didnt make a difference. Ok, once again, thanks for helping out an electrically challenged person. I am using the attached circuit to heat up the 3D printer bed. I need to study more.
If that is a problem, a 10K.
IRFZ34N | RDD Technologies
Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off. What I datashert is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot read from A0. Is your printer bed rotating? A better choice would be more dqtasheet ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible. If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET.
The test code I used is here.
PDF IRFZ34N Datasheet ( Hoja de datos )
Is the attached looking any better? MarkT Brattain Member Posts: 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.
A thermistor is a type of variable resistor used to measure temperature.
IRFZ34N getting too hot. It sends sine wave: