FuzzDog JenFuzz Manuale utente

J n Fuzz

Skanky 60s fuzz tones

No reproduction permitted without the express written

Important notes

If you’r using any of our footswitch daught rboards,

DOWNLOAD THE DAUGHTERBOARD DOCUMENT

•Download and read the appropriate build document for the daughterboard

as well as this one BEFORE you start.

•DONOT solder the supplied Current Limiting Resistor (CLR) to the main

circuit board even if there is a place for it. This should be soldered to the

footswitch daughterboard.

POWER SUPPLY

Unless otherwise stated in this document this circuit is designed to be

powered with 9V DC.

COMPONENT SPECS

Unless otherwise stated in this document:

•Resistors should be 0.25W. You can use those with higher ratings but

check the physical size of them.

•Electrolytics caps should be at least 25V for 9V circuits, 35V for 18V

circuits. Again, check physical size if using higher ratings.

LAYOUT CONVENTIONS

Unless otherwise stated in this document, the following are used:

•El ctrolytic capacitors:

Long leg (anode) to square pad.

•Diod s/LEDs:

Striped leg (cathode) to square pad. Short leg to square pad for LEDs.

•ICs:

Square pad indicates pin 1.

Schematic + BOM

R1 1M

R2 10

R3 33

R4 150

R5 4 7

R6 22R

R7 1

C1 10n‡

C2 10n‡

C3 Empty

C4 1n2

C5 22u elec

C6 15n

C7 100u elec

D1-2 BAT46*

D3 1N5817

Q1-3 Low gain NPN BJT**

BIAS 22 trimmer

FUZZ 1 B

VOL 50 A***

*Original diodes are SA815. Try what you like here - they’ll make a big difference to

the feel of the fuzz.

**Aim for 200-250 for Q1, 300-350 for Q2-3. Originals used BC238B and BC239C.

We’ve designed the PCB to take both TO-18 and TO-92 packages. See page 6 for

orientation information.

**100 A works much better - honestly.

‡If you want to beef up the sound, swap C1 and C2 for larger values, such as 47n.

The power and signal pads on the PCB conform

to the FuzzDog Direct Connection format, so can

be paired with the appropriate daughterboard for

quick and easy offboard wiring. Check the

separate daughterboard document for details.

Be very careful when soldering the diodes and

transistors. They’re very sensitive to heat. You

should use some kind of heat sink (crocodile clip

or reverse action tweezers) on each leg as you

solder them. eep exposure to heat to a

minimum (under 2 seconds).

Snap the small metal tag off the pots so they can

be mounted flush in the box.

You should solder all other board-mounted

components before you solder the pots. Once

they’re in place you’ll have no access to much of

the board. Make sure your pots all line up nicely.

The best way to do that is to solder

a single pin of each pot in place then melt and

adjust if necessary before soldering in the other

two pins. If your pots don’t have protective

plastic jackets ensure you leave a decent gap

between the pot body and the PCB otherwise

you risk shorting out the circuit.

There are extra pads on trimmers to allow

different package formats to be used. Pads are

connected via PCB traces as shown above, so

just fit your trimmer into whichever holes it fits

naturally into. As long as you have one pin each

in the top, middle and bottom sections.

No jumpers are required.

There’s no set voltage to aim for to bias this up.

Adjust it until it sounds good to you.

Transistor orientation

You can use transistors with any combination of pinouts.

TO-18 transistors should follow the screen print, with the emitter tab as shown.

Standard EBC transistors, such as 2N3904, 2N5088Standard EBC transistors, such as 2N3904, 2N5088Standard EBC transistors, such as 2N3904, 2N5088Standard EBC transistors, such as 2N3904, 2N5088Standard EBC transistors, such as 2N3904, 2N5088Standard EBC transistors, such as 2N3904, 2N5088

CBE transistors, such as BC238B, BC239C

E B C

Test the board!

Ch ck th r l vant daught rboard docum nt for mor

info b for you und rtak this stag .

UNDER NO CIRCUMSTANCES will troubl shooting h lp

b off r d if you hav skipp d this stag . No xc ptions.

Once you’ve finished the circuit it makes sense to test is before starting on the switch and LED

wiring. It’ll cut down troubleshooting time in the long run. If the circuit works at this stage, but it

doesn’t once you wire up the switch - guess what? You’ve probably made a mistake with the switch.

Solder some nice, long lengths of wire to the board connections for 9V, GND, IN and OUT. Connect

IN and OUT to the jacks as shown. Connect all the GNDs together (twist them up and add a small

amount of solder to tack it). Connect the battery + lead to the 9V wire, same method. Plug in. Go!

If you’re using a ribbon cable you can tack the wires to the ends of that. It’s a lot easier to take them

off there than it is do desolder wires from the PCB pads.

If it works, carry on and do your switch wiring. If not... aw man. At least you know the problem is

with the circuit. Find out why, get it working, THEN worry about the switch etc.

Your compl t d circuit board

including pots

Now’s the time

to refer to the

daughterboard

document for

your chosen

bypass method.

Enjoy your pedal!

This template is a rough guide only. You should ensure correct marking of your

enclosure before drilling. You use this template at your own risk.

Pedal Parts Ltd can accept no responsibility for incorrect drilling of enclosures.

FuzzDog.co.uk

Recommended drill sizes:

Pots 7mm

Jacks 10mm

Footswitch 12mm

DC Socket 12mm

Toggle switches 6mm

32mm

Drilling template

without battery

Hammond 1590B - 60 x 111 x 31mm

It’s a good idea to drill the pot and

toggle switch holes 1mm bigger i

you’re board-mounting them.

Wiggle room = good!

This template is a rough guide only. You should ensure correct marking of your

enclosure before drilling. You use this template at your own risk.

Pedal Parts Ltd can accept no responsibility for incorrect drilling of enclosures.

FuzzDog.co.uk

Recommended drill sizes:

Pots 7mm

Jacks 10mm

Footswitch 12mm

DC Socket 12mm

Toggle switches 6mm

32mm

Drilling template

with battery

Hammond 1590B - 60 x 111 x 31mm

It’s a good idea to drill the pot and

toggle switch holes 1mm bigger i

you’re board-mounting them.

Wiggle room = good!

Indice

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