0.5A resettable fuse/polyfuse.

[beakie]

I can't find anywhere I can buy a cheap non SMD version from?

Tried ebay and Maplin. Is there another word I should be looking for to find what I want?

Thanks
G

 

[MikeMl]

Select from this table

 

[Speakerguy]

PTC resettable fuse. Polyfuse, Polyswitch.

**broken link removed**

ETA: Ah! MikeMI beat me by a minute

 

[beakie]

Is this one?

**broken link removed**


It is for this --> https://www.electro-tech-online.com/custompdfs/2010/10/FT232RL-Breakout-Schematic.pdf

 

[Speakerguy]

Yes that is what you want. Although you shouldn't need such a large fuse. That circuit shouldn't draw anywhere near 500ma. I would get a fuse rated for less current, and I personally would probably just use a regular old fuse if I even used one at all on that ckt.

 

[beakie]

Yes that is what you want. Although you shouldn't need such a large fuse. That circuit shouldn't draw anywhere near 500ma. I would get a fuse rated for less current, and I personally would probably just use a regular old fuse if I even used one at all on that ckt.

what about this?

**broken link removed**

 

[Speakerguy]

That would be fine. You will need to desolder and replace if it ever blows obviously, but the odds of that circuit blowing a fuse are about 0.000001% unless you wire it up wrong or have a short somewhere.

 

[beakie]

That would be fine. You will need to desolder and replace if it ever blows obviously, but the odds of that circuit blowing a fuse are about 0.000001% unless you wire it up wrong or have a short somewhere.

Thanks. Will do that.

However, I do think the odds of ME blowing it are higher than those suggested

 

[beakie]

Yes that is what you want. Although you shouldn't need such a large fuse. That circuit shouldn't draw anywhere near 500ma. I would get a fuse rated for less current, and I personally would probably just use a regular old fuse if I even used one at all on that ckt.

When the schematic says 500mA... does it mean holding or tripping current?

 

[ben7]

A 500mA fuse shall be fine to use indeed

 

[beakie]

A 500mA fuse shall be fine to use indeed

But does the 500mA mean holding or tripping?

 

[3lectrokid]

i wouldn't advise trying it but from experiments with my laptop if I short the wires all that happens is power is cut for a period of time and is then turned back on. it shouldn't be that dangerous if you short your terminals for a short period of time.

HOWEVER I DO NOT YOU ADVISE PERSONALLY TRY THIS. IF YOU MAKE A SHORT AND IT BLOWS YOUR USB CONTROLLER I AM NOT PERSONALLY HELD RESPONSIBLE IN ANY WAY AND CANNOT BE TAKEN TO COURT OR ANYTHING OF THE SORT.

 

[beakie]

i wouldn't advise trying it but from experiments with my laptop if I short the wires all that happens is power is cut for a period of time and is then turned back on. it shouldn't be that dangerous if you short your terminals for a short period of time.

HOWEVER I DO NOT YOU ADVISE PERSONALLY TRY THIS. IF YOU MAKE A SHORT AND IT BLOWS YOUR USB CONTROLLER I AM NOT PERSONALLY HELD RESPONSIBLE IN ANY WAY AND CANNOT BE TAKEN TO COURT OR ANYTHING OF THE SORT.

Sorry, what??? I am entirely confused by your post...

 

[3lectrokid]

Sorry, what??? I am entirely confused by your post...

sorry I was tired at the time when it was written

what I was trying to say was that if I short the +5v and ground wires a small resettable fuse inside my laptop trips cutting power to the ports and then resets after about 5 seconds after the short had been removed. And as I said don't blame me if your laptop doesn't have a fuse and you try it and your usb controller blows.