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Turning on H4 Car Headlight Bulb with IRF3205 MOSFET

797 ratings | 146227 views
This high power MOSFET has an on-resistance of just 8mΩ, but only if the gate is raised to a sufficiently high potential relative to the source pin.
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Text Comments (53)
David Bolha (1 month ago)
Thank you ! 😇🤗
The Kaiser (5 months ago)
oktay dogan (6 months ago)
Yazıdan bir şey görünmez.. Invisible from the article
Blu Crystl (11 months ago)
Markus Tonsaker (1 year ago)
Is the light brightness peaking and then dimming down a bit or is that just the white balance on the camera?
gevv (1 year ago)
olivia-J Trans (1 year ago)
Thank you very much you do know the subject well.
Dani Barza (1 year ago)
Which mosfet should I use to do the same thing but to make the light on only when I put + 5v on the left pin?
ArgentineGuy (1 year ago)
Dani Barza IRFZ44N or IRLZ44N. Though, if you are planning to connect it directly to an IC, I think you have to protect it from the gate's high capacitance.
Volkswagen1990 (1 year ago)
Isn't the main beam 60W? I thought the dipped was 55W.
Abdelbaset Elhangari (1 year ago)
Do we need a mosfet? Why don't we use a simple mechanical switch?
Edward Mendoza (1 year ago)
cause solid-state devices are better than those primitive mechanical ones for high current applications. mechanical ones deterioriate easily when switched on and off repeatedly while carrying large currents. cars headlights for example draw 4-10 amps.
Joe (1 year ago)
Abdelbaset Elhangari he just want to show what exactly mosfet can do and how its work
gober17 (2 years ago)
Very good ..Thank you
legal gostei
ExtantFrodo2 (2 years ago)
I miss your flash light. :-( Great tutorial, thanks.
Douglas Kay (2 years ago)
It would be better if you connect two resistors in series say about 10k and 8k across the battery terminals with the 10k to the positive and 8k to negative and with a wire from the centre junction to the gate that will switch the light on then short the 8k resistor to switch it off.
Dan Coulson (1 year ago)
That will act as a voltage divider... Only about six or seven volts will be seen by the mosfet gate pin. To fully turn on, it want's to see around 10v.
can you plug it on a 12 v convertor
andymouse123 (2 years ago)
did you no you should do these tutorials for a living!  If ya did ya would be bloody rich! but then ya might not make the vid's and so on. a paradox . never mind keep it up and contact andymouse123 about his S.E.M project ...Ta!
Kris Kasprzak (2 years ago)
I have nearly the same setup except my MOSFET is a CSD18535KCS. At 5 V on the gate, the light fires up and my MOSFET (with a heat sink) stays around 100 deg F. I then hook up a PWM from an arduino around 32kHz and the MOSFET gets super hot within a minute? Inductive load creating spikes? not sure, thoughts?
Dan Coulson (1 year ago)
It wouldn't hurt to connect a back emf diode across the drain and source.
Mathieu Melenhorst (2 years ago)
+Kris Kasprzak Did you connect a resistor of about 100 ohms (or 1k) in series with the gate? Solder it at the gate connection without wires. Maybe your circuit is oscillating. As mentioned before: MOSFETs get easily damaged by static discharge at the gate pin. So touching these devices with your fingers might destroy them as mentioned earlier.
Зря этак делаете. Можете забежать в зону исходного управляющего напряжения, где рассеиваемая мощность может превысить наивысшую паспортную. Транзистор может сгореть.
Tony Philipsson (3 years ago)
With automotive there have always been the tendency to do all switching high side, as chassis is ground IRF3205 is a n-mosfet and you would need to apply 22V to the gate if you placed it high-side in a 12.8V system  A mosfet-gate-driver with built-in charge pump could to that.
Mrcaffinebean (1 year ago)
Tony Philipsson thanks for posting this comment Tony. I was looking at a MOSFET to drive and LED light bar so I dim it. I'll check out the charge pump.
Diaconu Florin (3 years ago)
i have the same IRF3205 and if i try the same experiment with 12v LED array (resistors on board) and 12v 2A power brick my leds will stay always on from the moment i connect them and it wont turn off. What am i doing wrong?
subconscious mind (6 days ago)
Connect 10k ohm resisor between gate and earth ( - ) .... But at this case u can't make transistor on until u pot in Gate 5v through 1k ohm.... Or 10 K ohm with 12 v
Yuji Naka (3 years ago)
That's why in the circuit, mosfet needs a resistor divider across gate and source to give path for the gate to discharge, otherwise the switching won't happen. Nice tutorial! Thanks.
2slofouru (3 years ago)
One day, all vehicles will stop using mechanical relays and start using these. Until then, we will continue to replace relays. These on the other hand, are a little trickier to keep happy on the control side. 
Marcos Moura (4 years ago)
I connect gate to ground, 12v to motor +, the motor - to the drain and the source to ground... My motor keeps rotating dispite of what I input to the gate, +12v or 0V.. My mosfet is the same as yours, 
mibars (4 years ago)
+jusb1066 Yes, there are at least two ways of doing this. One is using a P-MOSFET (this one is N-MOSFET) which are usually less efficient, in other words same low RDSon resistance will cost you more, the other way is using some drive circuit capable of boosting voltage a little bit above your positive voltage and using it to drive a gate so there is always higher potential on gate than what's you are switching. Despite it involves more components it may be actually more cost effective due to lower cost and popularity of N-MOSFETs
mibars (4 years ago)
This is brilliant, switching MOSFET by using your own body as gate resistor to bring potential up and down :)
Howard Ellison (4 years ago)
A model of clarity, worth a stack of books.  Thank you.
mecher abad (2 years ago)
yes sir..
Howard Ellison (2 years ago)
+mecher abad Thankyou, Mecher! Skill as a mechanic is, I think, very transferable to electronics. Some items have similarities, as well: a transformer is effectively a gearbox, an inductor has something in common with a spring, a capacitor is not unlike a vessel of fluid.
mecher abad (2 years ago)
+Julian Ilett sir can you make a PWM DC12VOLTS can handle a high ampers?please reply.i'm the one of your subscribers
mecher abad (2 years ago)
ok sir thaks for your responds.you have a great video sir.that is a big help for me.i am a mechanic and i want to learn some other project like this.
Howard Ellison (2 years ago)
+mecher abad Hi Mecher. I am no electronics expert! I think a pulse width modulated signal can be amplified by almost anything, even valves, and a power mosfet or two may be used for that in a PWM amplifier as used in modern hi fi and some portable radios for high efficiency. For sure, I could not make one myself unless I had very clear wiring plans!   Might as well add here, I dislike the sound of such amplifiers. Rough.
richmond billones (4 years ago)
i have a transistor that is n-channel mosfet but i can't find it's datasheet it's 07N65E transistor... I followed your schematic..then i build one using 07N65E it works! but before i touch the POSITIVE TO GATE, the led that i use start to glow itself before i touch it WHY?
richmond billones (3 years ago)
+Scott x thnks 
Scott x (3 years ago)
Its because the Gate capacitance has stored a charge, either from static or local/ambient electrical fields, turning it on. If you keep a high resistance resistor between the Gate and GND, it will remain off until switched on by your drive signal. It will bleed off any charge, but not be enough to load down/interfere with switching signal ex:  (100k, 1 Meg etc) Recently did that for a IRFZ44N, and others.
redtails (4 years ago)
Very nice little video on mosfets
haz939 (4 years ago)
Good mosfet but the IRF3205 can only handle 55v. I guess that's the pay off for the large amps.
chucky clark (4 years ago)
The beauty and wonder of electricity. Another wonderful and simply presented video.
Electro (4 years ago)
MOSFETs can be destroyed by a gate charging. You need to say that as a caution.
Julian Ilett (4 years ago)
I see you found the Mosfet tutorial which covers high-side switching. You can make the Mosfet turn off by putting a resistor across gate/source - 100k to 1M should work fine for low frequency switching.
Jusb1066 (4 years ago)
haha, now i see your mosfet tutorial! you are ahead of me, thank you
Jusb1066 (4 years ago)
couple of questions if i may, is there a way to run this on the positive side of the voltage, and is there another type of transistor that would turn off when you release touching?
Raymond Earle (5 years ago)
You have done it again. I did not understand MOS-FET transistors before. Seen many videos. But no-one came down to basics like you have. A magnificent tutorial for the people like myself known as thickos who WANT to learn. With tutors like you we will learn many wonderful things.Once again thank you. I can now start work designing and testing the control circuit for MY NICE EV.

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