Vintage Electronic Repair Reference



 

Conversions

 

1 inch (in,  ") = 2.54 centimeter = 25.4 mm Millimeters  = 25400 microns =1000 mils
1 meter = 39.370 078 74 inches
1 mil = 25.4 Microns
1 cubic inch = 16.3870646 cubic centimeters
1 cubic centimeter = 1 milliliter = 0.06103 cubic inches = 0.033814 fluid ounces
1 liter = 1000 ml = 1000 cubic centimeters = 0.2642 US gallons = 1.057 quarts = 33.82 fluid ounces = 61.03 cubic inches
1 fluid ounce (fl oz) = 29.57353 milliliter
1 U.S. Gallon =  = 3.785 liters =  0.8327 Imperial Gallons = 231 cubic inches = 0.1337 cubic feet
C = K - 273 = (F - 32)*(5/9) = (F - 32) x 0.555
F = 1.8 C + 32 = 2.25 R +32 = 32 + (9/5C)
1 pound = 16 ounces = .4535924 kilograms = 4.448222 newton
1 kilogram = 2.205 pounds = 35.27 ounces
Speed of Light=186,000 miles/sec or 299,792,458 meters/sec
Wavelength = Speed of Light / Frequency  ( ie:  Wavelength of 218 MHz would be 299,792,458 / 218,000,000  = 1.375 meters or 4.51 feet)


 

Orders of Magnitude

nano  n  .000 000 001  1 x 10 -9
micro  µ .000 001   1 x 10 -6
milli  m  .001   1 x 10 -3
centi  c  .01   1 x 10 -2
deci  d  .1   1 x 10 -1
deca  D  10   1 x 10 1
hecto  H  100   1 x 10 2
kilo  K  1 000   1 x 10 3
mega  M  1 000 000   1 x 10 6
giga  G  1 000 000 000   1 x 10 9
tera  T  1 000 000 000 000   1 x 10 12


 

Resistor Color Codes

 

1st & 2nd Color Band

Value   

Multiplier - Band 3

BLACK

0

X1

BROWN

1

X10

RED

2

X100

ORANGE

3

X1,000  (1K)

YELLOW

4

X10,000 (10K)

GREEN

5

X100,000 (100K)
BLUE

6

X1,000,000 (1M)

VIOLET

7

Silver: divide by 100

GRAY

8

Gold: divide by 10
WHITE

9

  • Tolerances
  • Gold =    5%
  • Silver =10%
  • None=  20%
  • This resistor would be 2.7 Meg-ohms with a ±5% tolerance

     

     

    EIA Capacitance Codes: Micro-Pico-Nanofarad to 1μf

    EIA CODE

    µF

    PF

    NF

     

    EIA CODE

    µF

    PF

    NF

    0R5

    0.0000005

    0.5

    0.0005

     

    201

    0.00020

    200

    0.20

    1R0

    0.0000010

    1.0

    0.0010

     

    221

    0.00022

    220

    0.22

    1R2

    0.0000012

    1.2

    0.0012

     

    241

    0.00024

    240

    0.24

    1R5

    0.0000015

    1.5

    0.0015

     

    271

    0.00027

    270

    0.27

    1R8

    0.0000018

    1.8

    0.0018

     

    301

    0.00030

    300

    0.30

    2R0

    0.0000020

    2.0

    0.0020

     

    331

    0.00033

    330

    0.33

    2R2

    0.0000022

    2.2

    0.0022

     

    361

    0.00036

    360

    0.36

    2R7

    0.0000027

    2.7

    0.0030

     

    391

    0.00039

    390

    0.39

    3R3

    0.0000033

    3.3

    0.0033

     

    431

    0.00043

    430

    0.43

    3R9

    0.0000039

    3.9

    0.0039

     

    471

    0.00047

    470

    0.47

    4R0

    0.0000040

    4.0

    0.0040

     

    511

    0.00051

    510

    0.51

    4R7

    0.0000047

    4.7

    0.0047

     

    561

    0.00056

    560

    0.56

    5R0

    0.0000050

    5.0

    0.0050

     

    621

    0.00062

    620

    0.62

    5R6

    0.0000056

    5.6

    0.0056

     

    681

    0.00068

    680

    0.68

    6R0

    0.0000060

    6.0

    0.0060

     

    751

    0.00075

    750

    0.75

    6R8

    0.0000068

    6.8

    0.0068

     

    821

    0.00082

    820

    0.82

    7R0

    0.0000070

    7.0

    0.0070

     

    911

    0.00091

    910

    0.91

    8R0

    0.0000080

    8.0

    0.0080

     

    102

    0.0010

    1,000

    1.0

    8R2

    0.0000082

    8.2

    0.0082

     

    112

    0.0011

    1,100

    1.1

    9R0

    0.000009

    9.0

    0.0090

     

    122

    0.0012

    1,200

    1.2

    100

    0.000010

    10

    0.010

     

    132

    0.0013

    1,300

    1.3

    110

    0.000011

    11

    0.011

     

    152

    0.0015

    1,500

    1.5

    120

    0.000012

    12

    0.012

     

    162

    0.0016

    1,600

    1.6

    130

    0.000013

    13

    0.013

     

    182

    0.0018

    1,800

    1.8

    150

    0.000015

    15

    0.015

     

    202

    0.0020

    2,000

    2.0

    160

    0.000016

    16

    0.016

     

    222

    0.0022

    2,200

    2.2

    180

    0.000018

    18

    0.018

     

    242

    0.0024

    2,400

    2.4

    200

    0.000020

    20

    0.020

     

    272

    0.0027

    2,700

    2.7

    220

    0.000022

    22

    0.022

     

    332

    0.0033

    3,300

    3.3

    240

    0.000024

    24

    0.024

     

    392

    0.0039

    3,900

    3.9

    270

    0.000027

    27

    0.027

     

    472

    0.0047

    4,700

    4.7

    300

    0.000030

    30

    0.030

     

    562

    0.0056

    5,600

    5.6

    330

    0.000033

    33

    0.033

     

    682

    0.0068

    6,800

    6.8

    360

    0.000036

    36

    0.036

     

    822

    0.0082

    8,200

    8.2

    390

    0.000039

    39

    0.039

     

    103

    0.010

    10,000

    10

    430

    0.000043

    43

    0.043

     

    153

    0.015

    15,000

    15

    470

    0.000047

    47

    0.047

     

    183

    0.018

    18,000

    18

    510

    0.000051

    51

    0.051

     

    223

    0.022

    22,000

    22

    560

    0.000056

    56

    0.056

     

    273

    0.027

    27,000

    27

    620

    0.000062

    62

    0.062

     

    333

    0.033

    33,000

    33

    680

    0.000068

    68

    0.068

     

    393

    0.039

    39,000

    39

    750

    0.000075

    75

    0.075

     

    473

    0.047

    47,000

    47

    820

    0.000082

    82

    0.082

     

    563

    0.056

    56,000

    56

    910

    0.000091

    91

    0.091

     

    683

    0.068

    68,000

    68

    101

    0.00010

    100

    0.10

     

    104

    0.10

    100,000

    100

    111

    0.00011

    110

    0.11

     

    124

    0.12

    120,000

    120

    121

    0.00012

    120

    0.12

     

    154

    0.15

    150,000

    150

    131

    0.00013

    130

    0.13

     

    184

    0.18

    180,000

    180

    151

    0.00015

    150

    0.15

     

    224

    0.22

    220,000

    220

    161

    0.00016

    160

    0.16

     

    474

    0.47

    470,000

    470

    181

    0.00018

    180

    0.18

     

    105

    1.00

    1,000,000

    1,000

     

     

    Capacitor Color Codes

    Large capacitors are simply marked with their values. Smaller caps use a color coding scheme of which there are several different codes.

    6 Dot Code

    Type

    1st & 2nd Color Band

    Value   

    Multiplier - Band 3

     % Tolerance

    jan, mica BLACK

    0

    X1

    ±20
      BROWN

    1

    X10

     
      RED

    2

    X100

    ±2
      ORANGE

    3

    X1,000  (1K)

    ±3
      YELLOW

    4

    X10,000 (10K)

    ±4
      GREEN

    5

    X100,000 (100K) ±5
      BLUE

    6

    X1,000,000 (1M)

    ±6
      VIOLET

    7

    x10,000,000 (10m)

    ±7
      GRAY

    8

    x 100,000,000 (100m) ±8
    eia, mica WHITE

    9

    x 1,000,000,000 (1G) ±9
      GOLD   .1  
    molded paper SILVER   .01 ±10
                 Body   .01 ±20

     

    Note the arrows....  The value is read as oriented in a clockwise direction.

    This reads as a 25 pf Mica capacitor with a ±6% tolerance

     

     

    Last Modified: June 22, 2006

     

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