In the above circuit, how can i limit the voltage and the current that the mosfet provides to the motor. Is that done with the PWM?
The format of the circuit is not the best.I see an Arduino connected directly to the AC mains- a very dangerous practice.
Use an isolation transformer.
translation - the circuit is at mains potential meaning touching anything while plugged into mains can be lethal. we recently had a girl (AUS) that got killed talking on an iphone while it was being charged (electrocuted - 240vac).Without transformer isolation, or optical isolation, it is a death trap!
Sounds like an urban myth. Cellphone chargers are isolated switch mode power supplies. Do you have link to an "official" story?translation - the circuit is at mains potential meaning touching anything while plugged into mains can be lethal. we recently had a girl (AUS) that got killed talking on an iphone while it was being charged (electrocuted - 240vac).
The Arduino ground is only one diode drop away from mains potential, Shteii01!But as far as I can see, Arduino is not connected to mains. They are sourcing 5 volts and providing ground from Arduino, but that is for circuit that comes after the rectifier.
Ah, ok, yes, I can see that. I actually have/had very little to do with designing/studying power supplies so I need all the pointers and guidance I can get.The Arduino ground is only one diode drop away from mains potential, Shteii01!
hi Ken,Sounds like an urban myth. Cellphone chargers are isolated switch mode power supplies. Do you have link to an "official" story?
Ken
It would be interesting to see the coroner's forensics report. In those links one said it was a cellphone and another it was a laptop. I'm trying to imagine the electrical path from a failed charger to a laptop/cellphone (exposed conductive materials?) to a pair of headphones (never seen ones with conductive cases). Seems like there's something missing there...like she was sitting in the bath tub.hi Ken,
local (AUS - sydney morning herald)
http://www.smh.com.au/nsw/faulty-us...or-sheryl-aldeguers-death-20140627-zsoc8.html
UK
http://www.telegraph.co.uk/news/wor...-Australia-killed-by-cheap-phone-charger.html
translation - the circuit is at mains potential meaning touching anything while plugged into mains can be lethal. we recently had a girl (AUS) that got killed talking on an iphone while it was being charged (electrocuted - 240vac).
In the belove circuit they are not using a transformer.Without transformer isolation, or optical isolation, it is a death trap!
In the belove circuit they are not using a transformer. Do I need to use one?Without transformer isolation, or optical isolation, it is a death trap!
I'm suspicious too. It would be incredibly difficult to get this current path (as shown in the news webpage);It would be interesting to see the coroner's forensics report. In those links one said it was a cellphone and another it was a laptop. I'm trying to imagine the electrical path from a failed charger to a laptop/cellphone (exposed conductive materials?) to a pair of headphones (never seen ones with conductive cases). Seems like there's something missing there...like she was sitting in the bath tub.
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YES, YES, YESDo I need to use a transformer?
As MikeML says, most definitely YES!Do I need to use a transformer?