Which transistors should i use?

[BabyGeezer]

It looks like a Link embedded in a Link

or, to be precise, a URL link (to the image) that will be activated when user clicks the image in the [ img ] tags.

[MarkT]

MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

The NPN won't waste 0.7V in saturation, 0.1V more likely.  0.7V is the base-emitter voltage.

[raschemmel]

It looks like 0.3V for 50ma  and 1.0 for 500 mA
2n2222

[puelon]

MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

is there any alternative MOSFET to IRL? i would have to import it, and takes to long lol

[ted]

Check the MOSFET which you already have, you need a switching mosfet, in data sheet look for threshold voltage less than 5V.
example - IRF540
Gate-Source Threshold Voltage VGS(th) VDS = VGS, ID = 250 μA 2.0 - 4.0 V

https://www.vishay.com/docs/91021/91021.pdf

[puelon]

is there any alternative MOSFET to IRL? i would have to import it, and takes to long lol

Check the MOSFET which you already have, you need a switching mosfet, in data sheet look for threshold voltage less than 5V.
example - IRF540
Gate-Source Threshold Voltage VGS(th) VDS = VGS, ID = 250 μA 2.0 - 4.0 V

https://www.vishay.com/docs/91021/91021.pdf

Yeah i see it: Min 2.0 max 4.0. But i still don't follow, i was told this isnt a logic level MOSFET, therefore i couldnt switch it to what i wanted, and i was looking all around me and far for it and nothing. So, you're saying i could do it with a IRF? im confused

[ted]

which transistor you are testing ?

[puelon]

which transistor you are testing ?

IRF540, but i cant get it to work

[ted]

Start with this

[puelon]

Start with this

Yeah, but my question remains will a IRF540 suffice?

[ted]

Make this work then go to next step

[puelon]

Make this work then go to next step

this circuit is using a transistor and theres absolutely no specification whatsoever, and lacks plenty of information

[ted]

Just test it and tell me the results.

[Wawa]

You were adviced to use a normal bjt transistor with 220ohm base resistor (post#3).
Perfectly ok for a small ~140mA load.
Almost any small/medium transistor can be used for a load like that.
Why are you still trying to use a non-logic IRF540 mosfet.
You like gambling?

...in data sheet look for threshold voltage less than 5V.

Silly advice. A logic level mosfet must have a threshold voltage <2volt.
A Vgt of 2-4volt is a non-logic level type.
Leo..

[outsider]

I think @ted meant IRL540.
https://www.vishay.com/docs/91300/91300.pdf
A 5-for-a-dollar 2N2222 would work fine.