Passives
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Capacitors
Some capacitors manufactured between 1999 until today are made with bad electrolyte. Avoid these, see Capacitor plague for more info.
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.
