Heathkit SB-1000 - Rectifier Circuit Board Assembly

Page 10
RESISTOR COLOR CODE
Band 2 Band3
RESISTORS
Resistors are identified in Parts Lists and steps by
their resistance value in Q (ohms), kQ (kilohms), or
{ifused)
2nd Digit | 3rd Digit
Heathkit
MQ (megohms). They are usually identified by a
color code of four or five color bands, where each
color represents a number. See the "Resistor Color
Code" chart. These colors are given in the steps in
their proper order (except the last band, which
indicates a resistor’s "tolerance"; see the “Resistor
Tolerance Chart"). You do not need to memorize the
color codes.
Oo
1
2
3
4
5
6
7
8
9
Multiplier
BANDS: 123 Tolerance
5-BAND RESISTORS
Note (21%)
| CBN OUALNY=0
|] CMI MUABNAO
1
10
100
4,000
10,000
400,000
1,000,000
10,000,000
100,000,000
O01
A
RESISTOR TOLERANCE
4BAND RESISTORS
Ee
BANDS: 1 2
Muttiotier "Tolorance
COLOR OR LETTER
Occasionally, a “precision” or “power” resistor may
have the value stanped on it. The letter R, K, or M
may also be used at times to signify a decimal point,
asin: 2R2=22Q
2K2 = 2.2 kQ, or 22002
2M2 = 2.2 MQ
Precision resistors may also be marked as shown in
the following examples. The values of the
multipliers are shown in the "Multiplier Chart,"
and the tolerance values are shown in the "Resistor
Tolerance" chart.
SILVER
OLD
ea 100,000
ee es
Value ‘Tolerance
fl
EXAMPLES: 1009C = 1000.1 = 10.9, «0.25% CAPACITOR TOLERANCE
1001D = 100 x 10= 1000 9, +0.5% 10 pFOR OVER
LETTER LESS 40 pF
B | +0.1 pF
CAPACITORS a ea
D 4055
Capacitors will be called out by their capacitance F £1.0pF 1%
value in pF (microfarads) or pF (picofarads) and G 22.0pF + 2%
type: ceramic, Mylar®, electrolytic, ete. Som & a
ype: ceramic, Mylar®, electrolytic, etc. e <a
capacitors may have their value printed in the K 10%
following manner: M 20%
First and second digits of
capacitor's value: 15 A-
Multiptier: Multiply the TSak
fist encord diet Bp EXAMPLES: 151K = 15X10=150 pF
the
proper
value
from
the
759
=
75
X0.1
=
7.5
pF
“Multiplier Chart” i]
To find the tolerance of NOTE: The letter "R” may be used at times to signify
the capacitor, look up a decimal point, as in: 2R2 = 2.2 (pF or pF).
this letter in the capacitor Tolerance chart