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Topic: [Solved] Arduino Fuse (Read 4481 times) previous topic - next topic

tsunamy_boy

Apr 21, 2014, 04:25 pm Last Edit: Apr 22, 2014, 12:54 am by tsunamy_boy Reason: 1

Can anyone tell me where can i get this kind of fuses? Also the value and the name of it.
I believe it's called polyfuse (as it says in the picture)

JohnBoog

#1
Apr 21, 2014, 11:12 pm Last Edit: Apr 21, 2014, 11:20 pm by JohnBoog Reason: 1
According to the schematic, it is a 500mA fuse:

http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf

Just replace with any other 500mA fuse, or search Ebay for a 500 mA polyfuse.

Edit: I thought you were talking about an UNO, but you are not. Anyway, a 500mA should be enough . (Normally a 250mA fuse will do the job also)

tsunamy_boy


According to the schematic, it is a 500mA fuse:

http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf

Just replace with any other 500mA fuse, or search Ebay for a 500 mA polyfuse.

Edit: I thought you were talking about an UNO, but you are not. Anyway, a 500mA should be enough . (Normally a 250mA fuse will do the job also)

Oh it's just because i wanted to also use a fuse on USB to serial so i don't burn out my computer. Would be just fine with 500mA do you believe so? or maybe 250mA would be better?

Thanks for your time

JohnBoog

#3
Apr 22, 2014, 12:08 am Last Edit: Apr 22, 2014, 12:11 am by JohnBoog Reason: 1

Oh it's just because i wanted to also use a fuse on USB to serial so i don't burn out my computer. Would be just fine with 500mA do you believe so? or maybe 250mA would be better?

Your USB ports on your computer should already have their own polyfuses, so there is nothing to worry about.

(Polyfuses will reset themselve after a while, although I have never ever encountered someone who 'blew' up an USB port from his laptop or computer by short-circuiting it. )

However, they do get mechanically worn out (bad contacts) , and it is also worlds only connector that only fits in one of two ways, but you still have to try to fit it in 3 ways before you will finally be able to insert it in his socket. :smiley-eek-blue:

Grumpy_Mike

The point about a poly fuse is that it resets itself so it does need replcing.
In fact they are very slow to blow when the current is just over the trip point and they are more of a protection against shorts. I don't think you will find a 250 mA one but if you do it would be too close to a normal load and might blow after an hour or so.

Sorry John a poly fuse is not something that goes in a socket, it is soldered in.

JohnBoog


Sorry John a poly fuse is not something that goes in a socket, it is soldered in.

Yeah I know....

I was talking about the USB connector.

CrossRoads

Parts like this
http://www.digikey.com/product-search/en?pv683=127&FV=fff4000a%2Cfff80390%2Caa80061&k=ptc+fuse&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

JohnBoog

Or this:

http://nl.farnell.com/jsp/search/browse.jsp?N=2021+202849&Ntk=gensearch&Ntt=polyfuse&Ntx=mode+matchallpartial

(Should be available in the US also, I think)

tsunamy_boy

Thank you guys. Understood :)
have a nice day you all

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