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REFERENCE GUIDE FOR PEDAL GEEKS By Marius Boye Skaatan Introduction As a DIY pedal builder there is quite a lot of stuff to remember. I find that I’m having problems remembering witch transistors is interchangeable with others, what size drill bits to use when drilling enclosures and how to read resistor and capacitor codes. I therefore made this little guide for myself, so I don’t have to look this up at Google every time I don’t remember a certain thing. I thought I should share it with you guys, if anybody wants this. It’s still under construction, so suggestions are welcome. Have fun building!

Drill measurements stompboxes

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Page 1: Drill measurements stompboxes

REFERENCE GUIDE FOR PEDAL GEEKS

By Marius Boye Skaatan

Introduction

As a DIY pedal builder there is quite a lot of stuff to remember. I find that I’m having problems remembering witch transistors is

interchangeable with others, what size drill bits to use when drilling enclosures and how to read resistor and capacitor codes. I therefore made this little guide for myself, so I don’t have to look this up at

Google every time I don’t remember a certain thing. I thought I should share it with you guys, if anybody wants this. It’s still under

construction, so suggestions are welcome.

Have fun building!

Page 2: Drill measurements stompboxes

DRILL SIZES Switches:

Footswitch Toggle switch Rotary switch

12mm 6mm 9mm

Audio Jacks:

Marshall style ¼” High quality ¼” Low quality ¼”

11mm 10mm 9mm

Headphone jack 3.5mm XLR Female XLM Male

6,5mm 22mm 19mm

Power:

DC jack isolated 2.1 mm Mains plug Fuse holder

13mm 20mm x 27,5mm 12,5 mm

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Potentiometers:

Alpha 16mm Alpha 24mm CTS Rev. log

7mm 8mm 9,5mm

Leds:

Led 5mm 5mm led mounting clip 5mm led reflector

5mm 6,5mm 8mm

Led 3mm 3mm led mounting clip 3mm led reflector 3mm 4,5mm 6mm

Page 4: Drill measurements stompboxes

Common transistors with pinouts

BJT

NPN PNP

PINOUT 1 PINOUT 2 PINOUT 3

Name NPN/PNP Pinout Hfe (Max-min) 2N3904 NPN 1 100-300 2N3906 PNP 1 100-300 2N4250 PNP 1 250-700 2N4401 NPN 1 100-300 2N4402 PNP 1 50-150 2N4403 PNP 1 100-300 2N5087 PNP 1 250-800 2N5088 NPN 1 300-900 2N5089 NPN 1 400-1200 2SA1015 PNP 3 70-400 2SC1815 NPN 3 70-700 BC549 NPN 2 420-800 BC550 NPN 2 420-800 BC559B PNP 1 180-460 BC559C PNP 1 380-800 BC560 C PNP 1 380-800

Page 5: Drill measurements stompboxes

DARLINGTON

NPN PNP

PINOUT 1

Name NPN/PNP Pinout Hfe (Max-Min) BC516 PNP 1 30000-< MPSA13 NPN 1 5000-< MPSA14 NPN 1 10000-< MPSA63 PNP 1 5000-<

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Mosfet

N-Channel P-Channel

PINOUT 1 PINOUT 2

Name N/P Channel Pinout 2N7000 N-Channel 2 BS170 N-Channel 1 BS250P P-Channel 1

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Jfet

PINOUT 1 PINOUT 2

Name N/P Channel Pinout 2N5457 N-Channel 1 2N5485 N-Channel 1 2SK117 N-Channel 2 2SK30A N-Channel 2 J201 N-Channel 1 MPFf102 N-Channel 1 NTE458 N-Channel 2

GERMANIUM

2SB22, 2SB175 and 2SB324 OC44 2N1303

Page 8: Drill measurements stompboxes

Reading resistor values

Resistor values are printed on the resistors with a colour code; witch is

made up by 4 coloured bands around the resistor. Some may even have a fifth band, which tell you the quality of the transistor. I won’t

discuss this more in this article, but I thought I should mention it.

Identifying the bands: Every resistor has one colour band separated from the others. This is the tolerance band. Start by holding the resistor so that this band is on the left side. You will then have three coloured bands, a little gap, and

finally the tolerance band.

1 2 3 4

The first two bands tell you the value of the resistor, while the third band is the multiplier. The multiplier tells you how many zeroes to

tack on to the number from the first two bands. You will then have the resistance in Ohm. The fourth band is, as mentioned earlier, the

tolerance rating.

Let’s use the resistor pictured above as an example. The first band is red, and you look at the table below you will see that red equals 2. The

second band is black, witch equals 0. As mentioned above, the first two bands indicate the resistance. In this case we have 20, but we still don’t know if it’s ohm, kilo ohm or mega

ohm. This is what the third band will tell us. The third band on this

Page 9: Drill measurements stompboxes

resistor is orange, and from the table below you can see that orange equals 3. That means we have to add 3 zeroes to the number we got from the first two digits to get the resistance in ohms. That gives us

20 000 Ohm, witch equals 20KOhm.

The fourth band tells us the tolerance, and in this case it’s gold. Using the table below, you’ll see that a gold band means that the resistor has

a tolerance of 5%.

The resistor pictured above is therefore a 20KOhm resistor with a 5% tolerance rating.

Decoding the colour codes:

Colour band

0 1 2 3 4 5 6 7 8 9

Tolerance 1% 2% 3% 4% 5% 10% 20% Note that the colour for 5% tolerance is supposed to be gold, and that the number for 10% is supposed to be silver.

Page 10: Drill measurements stompboxes

Reading capacitor values

Unipolar capacitors are normally labelled with a code, much like the

colour codes of resistors. Here is a guide to decode these codes.

The first three numbers in the code tells you the value of the capacitor in pF, while the letter tells you the tolerance in percentage. The first

two numbers tell you the capacitance, while the third number tells you how many zeros you should tack on to the two first digits.

Example1:

This capacitor is marked with 153J. As mentioned above, the two first digits give the value of capitance; witch in this case is 15 pF. The next number tells you how many zeroes you should add to the value from the first two digits to get the capacitance in pF. In this case it is 3, witch means you have to add 3 zeroes to the first two numbers. That means that the total capacitance of this capacitor is 15000pF. The letter at the end of the code gives you the tolerance of the capacitor, and is based on this table: Letter Value

B 0.1 pF C 0.25 pF D 0,5 pF F 1 % G 2 % H 3 % J 5 % K 10 % M 20 %

Page 11: Drill measurements stompboxes

15(Capacitance) 3(number of zeroes) J (tolerance) 15pF x 1000 5%

15000pF 5% = 15nF 5% = 0,015µF 5%

153J therefore means that the value of the capacitor is 0,015µF 5%.

Convert ion chart for capacitor codes and values.

pF - Picofarad nF - Nanofarad µF - Microfarad Code

1000 1.0 0.001 102 1500 1.5 0.0015 152 2200 2.2 0.0022 222 3300 3.3 0.0033 332 4700 4.7 0.0047 472 6800 6.8 0.0068 682

10000 10 0.01 103 15000 15 0.015 153 22000 22 0.022 223 33000 33 0.033 333 47000 47 0.047 473 68000 68 0.068 683 100000 100 0.1 104 150000 150 0.15 154 220000 220 0.22 224 330000 330 0.33 334 470000 470 0.47 474 680000 680 0.68 684

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