Switching on a 55 watt car headlight bulb with an IRFZ44N MOSFET. Part of designing a solar voltage regulator at www.256.co.uk
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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I tried connecting irf3205 to 2 h4 bulbs in parallel, switching the low side, however, the 3205 overheated very quickly and shorted. Any advise would be appreciated.
I blew up 4 of these running a car ignition coil.
Bro resistance value
Can you tell resistor value
What is the value of the resistor? When I disconnect my fingers from the + from the power supply and the gate of the mosfet the light doesnโt turn off, it only turns off when I touch the gate and the source of the mosfet.
Very interesting tutorial thank you,ย Can someone help meย please.ย Could I use the 3.3v from my HC-SR501 PIR sensor to power on the Mosfet or does it have to be 5v? Thanks very much… John ๐
Hi, very nice video! I'm trying to use those mosfet, I would like to know what resistance you put gate/source and why you did it.
Thanks!
why you use this biggest heat sink ?, if you apply the correct voltage in the gate to toogle the mosfet out of the ohminc zone it shoul'd not become hot.
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GOD DAMN SIR,,, LOVE IT (Y) x5-STAR
(This will do Solar Tracking I believe)
Left-Right (two IRFZ44N two small solcells) ?
Very impressive demonstration of the very low gate current to conduct the MOSFET. It is the only semiconductor that operates as the vacuum tubes did, but conduct much more current.
I was asking those questions because in the early days when I was working with Mosfets without a proper driving circuit and the result was disastrous.
I'm very pleased to see your reply. I agree to your explanation with respect to 'charging up' the gate voltage. However, from the video I saw only a resistor across the Gate and Source. Did you also estimate the 'discharging time constant' so that the Mosfet will not get burnt ? Thks very much.
With dry fingers, it's possible to charge the gate slowly enough to get the MOSFET hot, but with wet fingers the charge time is so short it doesn't have time to warm up significantly. I tried using a 10Mฮฉ resistor (the highest value I have) in series with the IRFZ44N gate (1.5nF) but the rise time was too short to see and the MOSFET didn't get warm. Not surprising as the time constant (CR) is around 15ms.
By applying the 'Wet Fingers', the Mosfet may not be fully turned on and it may become very hot.
Model railway enthusiasts put signs on their layouts saying "Warning – 12,000 millivolts!" to stop children putting fingers on their railway tracks. But it's got nothing to do with electrocution. 12 volt batteries have their dangers; sulphuric acid can burn, hydrogen mixed with oxygen is explosive and high currents in wires can make them dangerously hot. But for electrocution to happen at 12 volts, conductors would have to be pushed deep into the chest cavity. I call that a double stabbing!