While passive electronic components like capacitors, inductors, and resistors can be manufactured to have almost any value, in practice most are produced in standard values.
Standard values are multiples of 10, 15, 18, 22, 27, 33, 47, 51, 68, 75, 82, and 91.
So, for example, you can easily get a .47 uFd capacitor or a 220 ohm resistor. You will not likely find a .53 uFd capacitor or a .17 mH inductor.
PRECISION:It is also important to understand how precise passive components values actually are. Common inductors are typically only 10% precision.
The importance of precision depends on the application. A designer will probably use a common 220 ohm resistor to limit current in an LED panel indicator because a little difference in brightness either way is not important. In setting the gain of an instrumentation amplifier, a filter application or the pulse width in a timing circuit, the selection of non-standard component values and better precision are frequently more critical.Most of what is widely commercially available low-current axial leaded inductors, in these values: (microhenries) .1, .15, .47, .68, 1, 1.5, 2.2, 3.3, 4.7, 6.8, 8.2, 10, 15, 22, 33, 47, 68, 100, 120, 150, 220, 330, 470, 680, 1000 (millihenries) 10, 22, 33, 47, 68, 100.
What is different about EMICON?
Emicon only makes non-standard values. Frequently needed for the precision
needed in some designs.
Emicon makes close tolerance parts. As precise as 1% (in lieu of the industry
standard of 10%).
Emicon makes parts than can be tuned in circuit for additional precision.
Emicon makes parts in the nanohenry range with higher-than-average Q factors
that is important to many electronic filter applications.