Passives
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Capacitors
Some capacitors are manufactured with bad electrolyte. Avoid these, see Capacitor plague.
Electrolytic
Aluminum
Tantalum
Ceramic
Film
Polyester (Mylar)
Polystyrene
Polycarbonate
Polypropylene
Teflon
Exotics
Mica
Glass
Oil
Vacuum
Inductors
"Ferrites? I don't know much about 'em, I only use ferrites in switching regulators." --National Semiconductor's Bob Pease
Can be replaced in many circumstances with an impedance inverter using only an opamp, a capacitor, and a few resistors.
