Re: Cracked resistor?

Yes. But making that mistake isn't beyond me, by any means. It's a very well-assembled board (I didn't do it), but well designed, too (I did it

-- and I'm modest, just ask me).

Plenty of water and the whiskey bottle has been properly drained.

The dissipation power is 200mW max.

So I lower than 0.3A.

If not, it burns !

Hello, and the only similar problem I've encountered is with those sandy-colored dropping resistors (rectangular parallelepiped shaped) that have been used in radios and TVs. They can swell and/or crack over a period of time. Repeated heating and cooling no doubt stresses the resistor material. Sincerely,

Some of those are 'Fuse Resistors', and are designed to fail open if the equipment starts drawing too much current, or if it is running too hot. I replaced hundreds, if not thousands of those in consumer electronics. Some OEMs switched to the Belfuse 'Chemical Fuses', which had a chemically coated element that would flash and vaporize the element at a set temperature.

They were quite common, in spite of Phil Allison's claim to the contrary.

Not much safety margin for an 0603.