Try again with a totally normal BRUSHED PERMANENT MAGNET DC MOTOR.

NOT a fan motor, which most likely has electronics inside that do not like to be PWM'd.
Fans are not usually simple brushed motors- because they would wear out way too fast.

 

also the 2n700 is good choice for 5V
https://create.arduino.cc/projecthub/ejshea/connecting-an-n-channel-mosfet-7e0242

 

also the 2n700 is good choice for 5V
https://create.arduino.cc/projecthub/ejshea/connecting-an-n-channel-mosfet-7e0242

Instead of guessing, what is the current drawn by the motor? Then, check the datasheet. A 2N7000 can handle 350mA of current. If the motor draws more than that, the 2N7000 is not a good choice.

 

Did you miss Audioguru Agains post?When the MOSFET has 5V on its gate, it is almost turned off. Less than 5V, it is turned off. The MOSFET you are using needs 10V to fully turn on. Hence, you’d be better off with a logic level MOSFET.

Υes you are correct from generator ( of elvis platfrom give 10 V amplitude in the p[ulse not 5 V ) and then the mosfet is full ON

 

You say the output is 10 volts amplitude but you don't say if the levels are - 5 volts in the low state and +5 volts in the high state or some other some other levels with a difference of 10 volts. Can you post the schematic of the output stages of your elvis signal generator or show the waveform when connected to your circuit on a oscilloscope together with the Y channel volts per division setting and the coupling set to DC. (I have never heard of "elvice signal generators"

Les.

 

The elvis platform produce a bipolar square wave
https://www.ni.com/en-us/shop/engin...neering-lab-workstation/what-is-ni-elvis.html

 

 

hi 1971,
If it is a 10V bipolar square wave, the positive swing is only +5V, not high enough for many MOSFET Vg On

E

 

yes i watch some video about the mosfet IRF520 and i saw that is not a good choice for logic circuit (like arduino) but work in my expirement
i take a video in next week and i upload here

thank you very much

 

hi,
These two PDFs, are Low Vgs options
E

 

hi,
These two PDFs, are Low Vgs options
E

https://components101.com/irf540n-pinout-equivalent-datasheet

 

this is a good choice for low voltage

 

hi,
It would not be my choice.
E

 

hi,
It would not be my choice.
E

IRLB8721PbF ?

 

i watch some video about the mosfet IRF520 and i saw that is not a good choice for logic circuit (like arduino) but work in my expirement

Well you struck lucky with the particular sample of the '520 that you have. If you were designing/building a circuit for someone else it would not be a good choice of MOSFET. Good designs have to take into account the toerances of individual components and allow for 'worst case' scenarios.

 

hi
The Vgs On is the Threshold voltage at which the FET starts low current conduction, it will not saturate the FET, which is what you need for the motor drive.
You have only a +5V drive signal so the FET will never be fully turned On
E

 

IRLB8721PbF ? View attachment 221591

 

The IRLB8721 looks better than the original choice for operation at 4.5V Vgs:


The IRLZ44 is a another choice.

 

hi,
The Vgs looks OK, but the Drain current specification is far in excess of the current required.
It should work OK.
E

 

The IRLB8721 looks better than the original choice for operation at 4.5V Vgs:

View attachment 221595
The IRLZ44 is a another choice.

i think yes the IRLB8721 which is best way to bias it ?