UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Quick-and-dirty testgear: mains voltage monitor.

broadgage · 18th Aug 2018, 10:48 am

If connecting one of these cheap volt meters to the mains, I would suggest protecting it with a small mains rated fuse.
This fuse will only blow in the event of a failure that requires replacement of the meter module, there is therefore no need for a fuse holder.

I would solder the fuse in place in series with the module and cover with two layers of heat shrink. Treat the whole assembly of module, fuse, and supply flex as disposable.

A 1 amp fuse will make any failure much less dramatic.

18th Aug 2018, 10:48 am	#20
broadgage Nonode Join Date: Jan 2010 Location: North Somerset, UK. Posts: 2,130	Re: Quick-and-dirty testgear: mains voltage monitor. If connecting one of these cheap volt meters to the mains, I would suggest protecting it with a small mains rated fuse. This fuse will only blow in the event of a failure that requires replacement of the meter module, there is therefore no need for a fuse holder. I would solder the fuse in place in series with the module and cover with two layers of heat shrink. Treat the whole assembly of module, fuse, and supply flex as disposable. A 1 amp fuse will make any failure much less dramatic.