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andunai
modified 6 years ago

MOSFET with pull down

4
19
239
05:04:07
For controlling 12V LED strip from a 3.3V ESP8266. Pull down resistor may not be needed because FET gate is connected to a digital pin which means it will never be floating.
published 6 years ago
hurz
6 years ago
first. take a proper mosfet model from @kianis library http://everycircuit.com/circuit/5282567524450304 yours here is to weak, even a little TO92 package is stronger
hurz
6 years ago
second. because its never floating you can demonstrate this with a logic train or SPDT. There is always a defined voltage level http://everycircuit.com/circuit/5989677635731456
lenzrulz
6 years ago
@kiani’s “MOSFET library” is erroneous, I would recommend using a reputable source, @hurz knows this to be true and yet propagates fiddled libraries, shame on him!
2ctiby
6 years ago
Lenzrulz is right, eg: the kiani library third from left on the second row (IRF540) states there an Rds(on) of 0.04 Ohm ... whereas the vishay.com datasheet states it as being 0.077 Ohm
2ctiby
6 years ago
Also it is pointless choosing any mosfet which has a VTO , ie a Vgs(th) , which is higher than your 3.3v gate voltage ... it would not switch on. It is better to learn a little about mosfets rather than a copy/paste from that kiani library with no understanding what the values represent. You may want to consider stepping that 3.3v up with a transistor so that standard mosfets could then be used, as an alternative to finding a Nmos with around 1v Vgs(th) ... I would also recommend keeping the pull down resistor in place unless you are very sure that the gate pin really does go to earth when off.
hurz
6 years ago
@2cent also agrees to @lenskis parallel resistor formula LOL. Why you both must spam @andunai and his circuit, i can only give @andunai the tipp to report you both to info@everycircuit.com there is no reason to start a messy debates here in this thread. @andunai warn them an if they dont stop report them both. same troll strategy here http://everycircuit.com/circuit/5213370886914048
2ctiby
6 years ago
I have not been involved in any parallel resistor thing ... this is typical diversion and lies from hurz in his usual attempt to divert attention and cause arguments. Users should carefully stick to technical points which relate to this thread only and not be diverted.
hurz
6 years ago
yes, and because you have said nothing as always when your friend does nonsense all the day you are silent. But when he comes around and shouts loud his bullshit you say thanks even you know he is a zero knowleged clown. Thats why you are guilty and can not taken serious. Tell him the truth all the time and we can start to take you serious. so far you are a bloody laier
hurz
6 years ago
Again, Lenny running around and talking bullshit, he knows nothing and also you should realise that. If not you are guilty in misuse him as reference. He is not a reference, he is nothing only terror, and now go over to @kianis loved library and continue there Lenny you better go home, cuz you have nothing to say, really nothing. Only Im Lenny im an idiot.
2ctiby
6 years ago
Lenzrulz is right, eg: the kiani library third from left on the second row (IRF540) states there an Rds(on) of 0.04 Ohm ... whereas the vishay.com datasheet states it as being 0.077 Ohm
2ctiby
6 years ago
Also it is pointless choosing any mosfet which has a VTO , ie a Vgs(th) , which is higher than your 3.3v gate voltage ... it would not switch on. It is better to learn a little about mosfets rather than a copy/paste from that kiani library with no understanding what the values represent. You may want to consider stepping that 3.3v up with a transistor so that standard mosfets could then be used, as an alternative to finding a Nmos with around 1v Vgs(th) ... I would also recommend keeping the pull down resistor in place unless you are very sure that the gate pin really does go to earth when off.
2ctiby
6 years ago
I have not been involved in any parallel resistor thing ... this is typical diversion and lies from hurz in his usual attempt to divert attention and cause arguments. Users should carefully stick to technical points which relate to this thread only and not be diverted.
hurz
6 years ago
IRF540 is your bad choice, Mr Messy. Yes and you have not seen this CRAP Lenny published and thats why you have said nothing. You also dont know like Lenny where the mistake in this crap webpage is which Lenny copied 1:1, its this what you want to tell us. You are also clueless in simplest basic electronics? @2cent, again dont forget IRF540 was your damn choice my little bloody laier
hurz
6 years ago
@lenski and you @2ctiby are talking bullshit, you better stop spam, multiple copys on foreign thread what an awesome idea from Mr Messy himself, stop your spam and @andunai will be thankful.
lenzrulz
6 years ago
Bypass my circuits and everyone will be happy...😂
hurz
6 years ago
First you bypass the community and everyone will be happy...😎
lenzrulz
6 years ago
You first!
2ctiby
6 years ago
@all users ... Hurz demands subservience in every, yes every aspect of electronics. If you show signs of knowing more than him in so much as one aspect, then the trio of hurz/zorgrian/kiani will set about insulting you etc in an effort to drive you out, or force you to actively show submissive stature... If you get on ok with hurz, then you have either been seen as obviously knowing less in every aspect, or you have compromised yourself and shown him that you are submissive to him... Be honest with yourself ... Have you yielded to his imposed superiority even though you know more about a particular aspect?  No one know best about everything ... but hurz believes that he does, and you will be forced to believe that too on EC.... or suffer the consequences.
2ctiby
6 years ago
I do not intend to spend my life here bickering on EC with a know-all like hurz. ... Individuals must decide whether to be subservient to him or not ... Those who submit themselves to him will never be able to voice an opinion which contradicts his view. Then you must always abide by everything he says ... and that may well influence your life path outside EC, which in my opinion would be towards a hell hole, with his partner zorgrian and their puppet kiani.

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