UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

kalee20 · 21st Jun 2018, 7:42 pm

Indoor fireworks are really for the off-line supplies. You won't see much with 24V.

I worked with a colleague who didn't bother with fuses for his prototypes. Fireworks were the order of the day when he worked on developing a 600W off-line switcher. A quick-blow low-rated fuse in series with the supply line to the switching stage won't save the devices, but it will prevent the rest of the circuit from turning into a charred mass with the flames leaping from exploding MOSFETS (as MrBungle says). You get an idea how much grunt is behind the mains, even with a standard 13A fuse in line!

21st Jun 2018, 7:42 pm	#12
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,081	Re: Switched Mode Power Supplies Indoor fireworks are really for the off-line supplies. You won't see much with 24V. I worked with a colleague who didn't bother with fuses for his prototypes. Fireworks were the order of the day when he worked on developing a 600W off-line switcher. A quick-blow low-rated fuse in series with the supply line to the switching stage won't save the devices, but it will prevent the rest of the circuit from turning into a charred mass with the flames leaping from exploding MOSFETS (as MrBungle says). You get an idea how much grunt is behind the mains, even with a standard 13A fuse in line!