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It sends sine wave: But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged.
Screen Shot at I measured a 2. I am using the attached circuit to heat irfz34 the 3D printer bed. 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.
(PDF) IRFZ34N Datasheet download
If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET. IRFZ34N getting too hot. So the heater can be on during reset until the pin 3 pinMode is executed in setup.
This is one of many useful ones. The thermistor 25W 5. I tried at datashewt the resistor from 10K to Ohm. Agree about the gate resistor.
I did connect a 10K from the gate to the ground. A thermistor is a type of variable resistor used to measure temperature. I need to study more. The gate resitor is way too high. Please point out what you are calling a thermistor on your diagram. A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible.
The behavior that you describe sounds like what jremington mentioned in reply 7. But that didnt make a difference. 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. But the thermistor isnt turning off. Triple check the wiring and post a circuit diagram hand drawn, not Fritzing.
The key specification is the value of Vgs quoted in the on-resistance section. Attached is the new circuit just a variation to my prev, this time using a pot. 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.
Is the attached looking any better? What I noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from dafasheet pot read from A0.
IRFZ34N Datasheet(PDF) – Kersemi Electronic Co., Ltd.
The test code I used datadheet here. If that is a problem, a 10K. Here is the code, Code: I am PWMing the pin 3 of the nano.
Ok, once again, thanks for helping out an electrically challenged person. Some people get confused by the threshold voltage – this is the voltage the device switches fully off, eatasheet on. 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. I read serial values and can see that the pot is working.
MarkT Brattain Member Posts: