Replacement USB fuse

The official PYBD running MicroPython, and its accessories.
Target audience: Users with a PYBD
Post Reply
User avatar
mathieu
Posts: 88
Joined: Fri Nov 10, 2017 9:57 pm

Replacement USB fuse

Post by mathieu » Wed Sep 11, 2019 3:02 pm

Hi all,

Does anybody know where the '1A fast/0.22Ohm fuse' used to protect VUSB could be purchased?

Also, how difficult/reckless would it be to replace the original with a new one?

Thanks.

chuckbook
Posts: 135
Joined: Fri Oct 30, 2015 11:55 pm

Re: Replacement USB fuse

Post by chuckbook » Wed Sep 11, 2019 5:25 pm

You may replace the fuse with an SMD resistor < 0.1 Ohm. Of course there is no more protection but the board works fine.
If I remember correctly, recent PYBD boards don't have a fuse installed.
Any well designed USB host port should have built in over current protection. As it tuned out that many USB host ports provide more current than standard 900 mA (for USB3), it doesn't make much sense to put in a 2A fuse.

User avatar
mathieu
Posts: 88
Joined: Fri Nov 10, 2017 9:57 pm

Re: Replacement USB fuse

Post by mathieu » Wed Sep 11, 2019 6:07 pm

Thanks. Out of curiosity, is there a compelling reason not to create a solder bridge over the top of the blown fuse, as an alternative to buying a SMD resistor?

User avatar
Roberthh
Posts: 3667
Joined: Sat May 09, 2015 4:13 pm
Location: Rhineland, Europe

Re: Replacement USB fuse

Post by Roberthh » Thu Sep 12, 2019 6:43 am

I would assume, just an engineers reluctance to replace a fuse with a wire. Beside that, a solder blob would most likely meet the requirement of < 0.1 Ohm resistance.

Post Reply