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 …
Tag Archive: cracked
Dec
11
Dec
10
555 timer in baby 10 sequencer cracked
A simple analog sequencer referred to as a baby 10 (step) sequencer is shown with a ICM7555IPA 555 timer cracked down the middle. Credit: http://www.flickr.com/photos/collinmel/ / CC BY-NC-SA 2.0
Nov
06
LeCroy 9400 Digital Oscilloscope’s ADC cracks
The ADC for this oscilloscope is cracked and malfunctioning – only the upper 4 bits work. The screws shown that hold the heatsink on the reverse side of the board were loose and probably caused it to overheat and eventually crack. Credit: http://www.flickr.com/photos/imager/ / CC BY-NC 2.0
Oct
29
Resistors destroyed by RF
Resistor was turned into a dipole antenna and coupled to the parts seen. They were destroyed when brought near a 40-50W radio transmitter. Credit: http://www.kevtris.org/