Magic Blue Smoke » explode http://www.magicbluesmoke.org When good electronics go bad. Fri, 27 Jan 2012 18:03:37 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 2N3904 transistor from class project power supply http://www.magicbluesmoke.org/288/2n3904-transistor-from-class-project-power-supply http://www.magicbluesmoke.org/288/2n3904-transistor-from-class-project-power-supply#comments Tue, 20 Apr 2010 00:37:10 +0000 MagicBlueSmoke http://www.magicbluesmoke.org/?p=288

2n3904 transitor from class project

A nice picture of a 2n3904 transistor used in a class project power supply that was destroyed along with other components not shown after a probable short.  Credit:  Lucas T.

]]> http://www.magicbluesmoke.org/288/2n3904-transistor-from-class-project-power-supply/feed 0 C945 transistor explodes in differential amp http://www.magicbluesmoke.org/245/c945-transistor-explodes-in-differential-amp http://www.magicbluesmoke.org/245/c945-transistor-explodes-in-differential-amp#comments Tue, 19 Jan 2010 01:48:49 +0000 MagicBlueSmoke http://www.magicbluesmoke.org/?p=245

Transistor in amplifier explodes

Transistor casing piece

An unfortunate accident while probing one of the transistors in part of a differential amp circuit led to a related transistor exploding.  Credit:  edman007.

]]> http://www.magicbluesmoke.org/245/c945-transistor-explodes-in-differential-amp/feed 0 MJE 13001 explodes in a GMT-TR20 USB Charger http://www.magicbluesmoke.org/236/mje-13001 http://www.magicbluesmoke.org/236/mje-13001#comments Tue, 19 Jan 2010 01:30:43 +0000 MagicBlueSmoke http://www.magicbluesmoke.org/?p=236 MJE13001 in GMT-TR20 explodes

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

]]> http://www.magicbluesmoke.org/236/mje-13001/feed 0 Varistor on UPS cracks http://www.magicbluesmoke.org/218/varistor-on-ups-cracks http://www.magicbluesmoke.org/218/varistor-on-ups-cracks#comments Fri, 11 Dec 2009 23:16:06 +0000 MagicBlueSmoke http://www.magicbluesmoke.org/?p=218

Continue reading »]]> UPS Capacitor fried

Board with blown MOV

UPS Capacitor fried - closeup

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:

]]> http://www.magicbluesmoke.org/218/varistor-on-ups-cracks/feed 1 Dynapower DP-40205 with exploded FET http://www.magicbluesmoke.org/178/dynapower-dp-40205-with-exploded-fet http://www.magicbluesmoke.org/178/dynapower-dp-40205-with-exploded-fet#comments Thu, 26 Nov 2009 00:02:07 +0000 MagicBlueSmoke http://www.magicbluesmoke.org/?p=178

Continue reading »]]> Dynapower DP-40205 top

DP-40205 top

Dynapower DP-40205 with exploded FET

Exploded FET

These pictures come from a Dynapower USA DP-40205 400W power supply.  It appears the standby regulation failed and took out the FET pictured above and also the capacitor and resistor near the top of the fan.  The exploded piece of the FET was rattling around the power supply when it was opened and the part that remained on the board was loose.  It’s suspected the capacitor damage was from overvoltage when the regulator failed for unknown reasons.  Credit: http://blog.kevtris.org/

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