Hi,
I contacted the sellers of that MOSFET module, I got this back.
Hi,
Thanks for your comments....
why do you fit am IRF520 MOSFET to this module
This is actually a product we buy in from a different company to resell and so it isn't actually designed by ourselves. As such I can only speculate the reason why the manufacturer chose this particular MOSFET. It is likely a combination of suitability/low cost/availability but as previously mentioned this is just a guess.
and quote 3.3V to 5V input voltage when the IRF520 is not a LOGIC LEVEL device. Vgs(threshhold) = 2.0 to 4.0V, threshold is where it STARTS to make the MOSFET conduct not where it does conduct efficiently.
I do agree that there is no reason why this module could not be used as an analogue device, however as our main customer base is the digital microctroller market we advertise the module as a digital switch to allow microcrontrollers to switch relatively heavy loads such as DC motors. The reference to the 3.3V and 5V switching voltages is to make it clear to this customer base that the module can directly interface to, and be controlled by, both 3.3V and 5V microcontrollers.
I will make sure the specification is updated to make it clearer as to what this parameter is in reference to.
Regards
Andrew
The RED is me.
Can someone explain the underlined BLUE response.
I never refered to analog operation.
Is Andrew an Engineer, or a Sales Engineer? :o :o
Spleeling arrors not myne.
I have replied asking for an ELECTRONICS ENGINEER to read my emails.
Tom..... 