Jan
18
MJE13001 in GMT-TR20 explodes
This transistor comes from a GMT-TR20 USB phone charger which was distributed with the L7, L9 and other phones. After the explosion a trace to the transistor was destroyed and the PCB was blackened. Wire was run to replace the damaged traces and after the transistor was replaced the charger worked again. Credit: http://gushh.net/blog
Dec
14
Credit: Anonymous
Dec
11
Credit: Anonymous
Dec
11
Board with blown MOV
Closeup of failed MOV
The burned part shown appears to be a MOV (Metal-oxide Varistor). The purpose of a MOV is to have a very high resistance until a certain voltage is reached at which point it will conduct current, in this case from “Hot” to “Neutral.” This property is useful for surge protectors. Original poster says this UPS was involved in an electrical fire. Credit:
Dec
10
A simple analog sequencer referred to as a baby 10 (step) sequencer is shown with a ICM7555IPA 555 timer cracked down the middle. Credit: