My experience as a repair technician with over 19 years, is that the two
most commonly failed items are power supplies and moving parts.  If you
live in an area with extremely high incidences of lightning storms such as
New Orleans or Florida, your power supply may very well fail long before
it's expected service life is up.
Regards,
Mike
----- Original Message -----
From: Roman Black <fastvid@EZY.NET.AU>
Sent: Tuesday, July 31, 2001 10:23:59 AM
To: <PICLIST@MITVMA.MIT.EDU>
Subject: Re: [EE]:Transformerless PSU (+ question for repairmen)

> Jinx wrote:
>
> > > resistor. I've got units like this running for
> > > 15 years and never failed
> >
> > Possibly an appliance as a whole was expected to live
> > a shorter time than the PSU so some components were
> > chosen for cost and simplicity. Say for example you have
> > a TV that craps out after 10 years. The manufacturer may
> > consider that a reasonable lifetime. Owner gets the fault
> > repaired and off goes the TV for few years more, and all
> > the while the power-handling components are going well
> > past their expected service life. Although perhaps that
> > was the case in the past - in these cheap import throwaway
> > days that might not be so
>
> So is Mr. Jinx planning a cheapy product? ;o)
> I would pull apart a few cheapy mains micro
> products, like electronic timers etc, look at how
> they do the Xc supply and make yours just that
> bit better. Should be good training for
> certification needs of the product too. Might
> even lead you to the right brands for the caps
> and semis too for cheap pricing.
> -Roman
>
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