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Frequently Asked Questions

Printed Circuit Instructions for Positive Boards.

Printed Circuit Instructions for Negative Acting Resist

Wire Gauge and Current Limit Table Ohm's Law Wheel PC Power Supply Pin-Out

Self-fusing Miracle Wrap by Tommy Tape
(YouTube Video)

How to Make a Network Cable Using Cat-5e EZ Connectors
(YouTube Video)

How to Make a Coax Cable
(YouTube Video)

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Other Great Videos coming soon

Resistor Color Code
Color 1st Band 2nd Band

3rd Band

 Multiplier

Tolerance

Black

0 0 1 Ω
Brown 1 1 10 Ω 1%
Red 2 2 100 Ω 2%
Orange 3 3 1000 Ω
Yellow 4 4 10000 Ω
Green 5 5 100000 Ω 0.1%
Blue 6 6 1000000 Ω 0.25%
Violet 7 7 10000000 Ω 0.10%
Grey 8 8 100000000 Ω 0.05%
White 9 9 1000000000 Ω
Gold 0.1Ω 5%
Silver 0.01Ω 10%
3-piece RF Instructions
Capacitor Codes

Small value Ceramic, Mylar, and polyester type capacitors have their values stamped on their bodies as a numerical code, 102, 223, etc.

 These codes can easily be deciphered into a standard value in microfarads.

The first two digits of the code indicate the two significant digits of the value. The third digit is the number of zeros to the right. Writing the first two digits, then the zeros will yield the value in picofarads.

  To converted to microfarads

move the decimal point six places to the left.

Examples:

Value

1st

2nd

Multiplier

Tolerance

 1,000 pf   ? 10% 1 0 2 K
 22,000  pf  ?20% 2 2 3 M
 47,0000 pf   ?5% 4 7 4 J

Tolerances:

C = 0.25pf

J = ? 5%

M = 20%

Y = -20 +50%

D = ?0.5pf K = ?10% P = +100-0% Z =  -20 +80%

Cat 5 Network Cable Standard pin-out Configuration

Pin #

1

2

3

4

5

6

7

8

Side 1
Side 2

Cross Over pin-out Configuration

Pin #
1 2 3 4 5 6 7 8
Side 1

Side 2

 

Holding the RJ-45 plug connector with the clip towards the bottom

and the side of the wire opening towards you,  pin 1 is on the left.


 The network only uses pins 1, 2, 3 and 6 so make sure both pairs 1&2 and 3&6 are twisted pairs.

SPECIAL COMPUTER CABLES AND ADAPTERS PIN-OUTS

DB9 NULL MODEM 

DB9

1

2

3

4

5

6

7

8

9

DB9

4

3

2

1 , 6

5

4

8

7

-

DATA TRANSFER (SERIAL LAP-LINK) CABLE

DB25Female

1

2

3

4 , 5

6

7

8

20

DB25Female

1

3

2

8

20

7

4 , 5

6

PRINTER NULL MODEM STANDARD

DB25

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

DB25

1

3

2

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

PARALLEL DATA TRANSFER (PARALLEL LAP-LINK) CABLE

DB25Male

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

DB25Male

1

15

13

12

10

11

7

8

9

5

6

4

3

14

2

16

17

18

19

20

21

22

23

24

25

  DB-25 NULL MODEM STANDARD TYPE 1

DB25

1

2

3

4

5

6

7

8

20

DB25

1

3

2

8

8

20

7

4 , 5

6

 DB-25 NULL MODEM STANDARD TYPE 2

DB25

1

2

3

4

5

6

7

8

20

DB25

1

3

2

NC

20

20

7

20

5, 6, 8

 DB-25 NULL MODEM FULL HANDSHAKE

DB25

1

2

3

4

5

6

7

8

20

DB25

1

3

2

5

4

8, 20

7

6

6

 DB-25 NULL MODEM FULL HANDSHAKE TYPE 2

DB25

1

2

3

4

5

6 , 8

7

20

DB25

1

3

2

5

4

20

7

6 , 8

DB-25 NULL MODEM NO HANDSHAKE

DB25

1

2

3

4, 5

6, 8, 20

NC

NC

7

11

12

DB25

1

3

2

NC

NC

4, 5

6, 8, 20

7

12

11

DB-9 TO DB-25 STANDARD

DB9

1

2

3

4

5

6

7

8

9

DB25

8

3

2

20

7

6

4

5

22

DB9 TO DB15 HIGH DENSITY (MONITOR ADAPTER)

DB9

1

2

3

4

5

6

7

8

9

DBH15

1

2

3

13

14

6

7

8

10 , 15

DB-9 TO DB25 NULL MODEM

DB9

2

3

8

7

5

4

1 , 6

DB25

2

3

4

5

7

8

20

---

Mac Video to VGA Video ( The following may allow many brands of VGA monitors to work on a Macintosh )

DB15 (2 row)

1 2 5 6 7 / 10 9 10 / 7 12 13 15

DBH15 (3 row)

6

1 2 7 3 14 8 13

(Type of Signal)

Red Video Ground Red Video Green Video Green Video Ground Connect to Pin 10 Blue Video Connect to Pin 7 Vertical Sync Blue Video Ground Horizontal Sync
More to come....

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Last Update 10/14/2015

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