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Greg,
Oh, I forgot, I think I was expressing my experience about 7805's... I've never found one that shorted Vin to Vout. Only some that have either failed entirely or have failed to put out enough current (ie, under a tiny load, they work) From your email, it would appear you've never experienced a shorted 7805 either. Cheers, Josh > Date: Sun, 22 Feb 2015 07:56:00 -0800 > From: gregor...@gmail.com > To: n8vem...@googlegroups.com > Subject: RE: [N8VEM-S100:6405] Discussion About Filter Capacitors > > Josh, > > Some of the repairs that I have performed over past 2 decades, were dead communication modems, etc. > that would not power on. > Many of these items were first generation users of the 7805 for +5 V rail regulation. > Often the regulator itself would be dead, but on a few occasions I would find 2 leads above PC board where the > tantalum capacitor use to be located. > In one modem, I found the top of the capacitor -- it had launched off the PC board, when it failed. > --- > Safety glasses are always recommended on live testing, on the workbench. > I had one tantalum fail, while modem was energized on the workbench -- it launched and hit the shop ceiling ! > > greg > > -- > You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. |