We communicate circuits with schematics. How we connect irf mosfet , here the problem is …. Should I try to use a BC for exemple to turn on the Mosfet like the schematic 3 and in this case when I put my output high the Mosfet is off, so I should put it Low to turn on my load, is it? Also, if you have the gate floating, the state of the mosfet could be undefined. It seems mosfet get burned every time.

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By “no gate voltage applied”, I assume rc not driving it – it’s unconnected, or connected to high impedance such as an input pin. At 5V volt on the gate, the IRF will pass something around 4. Diode in parallel with the dc motor is indeed a good thing. My question is thus: If you come up with an idea I would be happy to hear it.

If it would be just a wire i. Putting a resistor there may not be needed for a MOSFET, but it IS recommended to reduce the possibility of inductive feedback into the microcontroller and other forms of dirty business related to switching an inductive load like a motor.


Sign up using Email and Password. I am actually using it with octocoupler connected to 12V. Do you have any idea why is the mosfet not working properly and letting the 12v works on the led strip? Im actualy pondering the same question as Legolas.

More and more cheap Mosfets. Looking at those graphs one can see that at a gate to source level of 5V Irf5400 levels the IRF is only capable of delivering 1 Amp, whereas it is specified for 5,6 Amps continuous current.

mofor This will need a good heatsink if the load is on for more than a second or two, but it is no issue if it gets millisecond pulses every few seconds. Should you however be stuck with a FET like the Orf540 that really needs a high voltage to switch efficiently then use the following circuit: Checking the datasheet is always a good suggestion.

OK I try again: You will find the print design here.


The is somewhat better: Would be interested to hear how the FET holds krf540 on 8 Amps. But if it is working for you, that is good.

I will try source a IRL I will try it again after soldering it instead of using a breadboard. Learn how your comment data is processed. Would like to have a non inverting driver, do you have any recommendation how to solve this, or best IC driver for arduino.


The Vce in saturation is about 0. By continuing to use this website, you agree irg540 their use.

Using MOSFETS with TTL levels (5 Volt and Volt) – Arduino, ESP & Raspberry Pi stuff

Glad to be able to contribute! Rif540 using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It seems mosfet get burned every time. Sign up or log in Sign up using Google.

Email required Address never made public. I presume you are aware of the designcriteria of an H-bridge and the chances of shorting your PSU if you dont do the switching correctly.

Indeed, more and more FETs availablefor 3. Oh i fully agree David.