My experience has been mostly shorts, and opens, but I did have a cap in a
string start arcing internally. You could hear a nice frying buzz. I pulled
the plug before any other damage occurred. I got lucky on that one.
No bangs so far.
Randy
Randy E. Randall AB9GO
Network Engineer
UC Health
Randy.Randall@UCHealth.com
Phone 513-585-7146
Fax 513-585-7159
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Garland
Sent: Thursday, March 29, 2012 12:17 AM
To: amps@contesting.com
Subject: Re: [Amps] How to know when filter caps begin to fail
My experience is that the only time electrolytic caps explode is either when
the polarity is backwards or when a rectifier diode fails and AC appears across
them. I've found other age-related failures to generally be more benign.
Generally they just lose their capacitance but don't start conducting. Now
tantalum caps are another story. They almost always fail by short circuiting,
sometimes catching fire.
73,
Jim W8ZR
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