From: "Walter Harley"
Subject: Re: linear power supply noise questions
Date: Tue, 12 Nov 2002 16:53:38 -0800
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"James Meyer" wrote in message
> I'm probably going to open up a big can of worms, but there are several
> good reasons for using back-to-back polarized caps to substitute for
> caps, at least for signal coupling purposes.
Open away! I would really like to be making the best decisions I can, even
as an amateur.
As an aside: I feel quite ignorant of issues of component selection, and
wish that there were trustworthy sources of information. Does everyone out
there in the industry learn by word of mouth, the same way I am? I'm
thinking of factoids like: "Carbon composite resistors are noisier than
carbon film or metal film, but they can withstand higher current surges."
"Cermet potentiometers are more precise, but conductive plastic has longer
rotational wear life." "There are good reasons to use back-to-back
polarized caps to substitute for non-polar caps, at least for signal
coupling purposes." (Note: I don't know if all the above are true - please
don't anyone take these as facts, coming from me!)
Are there books on this subject, or even good mfr web sites? It seems it
could take forever and be very expensive to learn these things by personal
experience, especially as some component failures take many years or unusual
circumstances to manifest.