VEC-821K Instruction Manual
Super CW Filter Kit
9
Multilayer
271
(270 pF)
Ceramic Discs
|
|
1uF
35V
+
-
104
Electrolytic
1 uF
10 pF = 100
100 pF = 101
1000 pF = 102
.001 uF = 102*
.01 uF = 103
.1 uF = 104
Value Code
102
(.001 uF) (.1 uF)
As with resistors, it's helpful to sort capacitors by type, and then to
arrange them in ascending order of value. Small-value capacitors are
characterized in pF (or pico-Farads), while larger values are labeled in uF
(or micro-Farads). The transition from pF to uF occurs at 1000 pF (or
.001 uF)*. Today, most monolithic and disc-ceramic capacitors are
marked with a three-number code. The first two digits indicate a
numerical value, while the last digit indicates a multiplier (same as
resistors).
Electrolytic capacitors are always marked in uF. Electrolytics are
polarized devices and must be oriented correctly during installation. If
you become confused by markings on the case, remember the uncut
negative lead is slightly shorter than the positive lead.
Diodes:
Diodes are also polarized devices that must be installed correctly.
Always look for the banded or cathode end when installing, and follow
instructions carefully.
Cathode
Diode
LED
(shorter Lead)
Transistors:
If transistors are installed incorrectly, damage may result when power is
applied. Transistors in metal cases have a small tab near the emitter
lead to identify correct positioning. Semiconductors housed in small
plastic cases (TO-92) have an easily-identified flat side to identify
mounting orientation. Many specialized diodes and low-current voltage
regulators also use this type packaging. Larger plastic transistors and
voltage regulators use a case backed with a prominent metal tab to
dissipate heat (T-220). Here orientation is indicated by the positioning of
the cooling tab.
