FuzzDog The Gimp Manual de usuario

The Gimp

Germanium fuzz +++

No reproduction permitted without the express written

Schematic + BO

R1 220K

R2 470R

R3 5K1

R4 220K

R5 47K

R6 10K

CLR 2K2*

C1 10 elec

C2 100n

C3 2u2 elec**

C4 10u elec

C5 10u elec

Q1,2 PNP Ge***

Q3 2N3904

SANITY 5KC

GIRTH 500KC‡

CHOKE 10KB

GAG 10KB

THRUST 5KB

GRUNT 10KB

*2 x CLRs are required on the daughterboard. Use whatever you prefer as your

normal LED current limiter.

**Adjust to taste. Can be bigger or smaller.

***Typical Fuzz Face pair with hFE of ~70(Q1) / ~120(Q2). You can get good results

with a huge range of gains either side of those values. Normally AC128 or 2N404.

‡Can be 500KB, but the reverse log taper gives a better sweep.

Be very careful when soldering the diodes, LED 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. Keep

exposure to heat to a minimum (under 2 seconds).

The long leg (anode) of the electrolytic capacitors go into the square pads.

Snap the small metal tag off the pots so they can be mounted flush in the box.

Pot mounts on the back side of the board. You can use vertical-mount pots or just wire up ‘normal’ ones.

It’s a good idea to place the pots in their holes in the enclosure when you’re soldering them in place on the

PCB. That way you know they’re going to line up ok. Best way to do it is to solder a single pin of each pot in

place, then do a visual check to see that they’re all sitting at the same height. If not, melt the joints and re-

adjust any that are off.

If your pots don’t have protective plastic covers you should place a strip of thick card between them and the

board when soldering to keep them a good distance from the pcb to avoid shorting other components.

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 underside of the board.

ake sure your footswtich lugs are horizontal

as shown in red above when soldering into the

daugherboard. It’s a good idea to place them

in the holes in the enclosure when doing this

to ensure they line up ok.

Ensure you mount the footswitches on the right side of the daughterboard. It’s clearly marked. Otherwise

your ribbon cable connections won’t line up.

The boards are designed for a 6-way ribbon cable connection between them, but you can use any wire you

want. just make sure you connect the correct pads.

LEDs

You should leave these until you’re actually boxing up the circuit. They don’t need to be in place for the

circuit to work, so plug it in and test it before you add them.

Pull them up through the PCB (short leg to square pad), and slightly bend the legs out so they don’t fall

back through. Position your daughterboard into the enclosure and lightly secure the footswitches. You

should now push the LEDs down through the PCB and located them into their holes in the enclosure. Once

done, tighten the footswitches, check the LEDs are still in place, then solder them in.

WHY IS THERE AN EXTRA PAD FOR THE SANITY BYPASS FOOTSWITCH LED...?

Yes. You can use a bi-colour LED in there if you want, i.e. green for normal, red for ORE.

Use a common-anode LED.

IN OUT

WIRING

Couldn’t be much easier really. Once you have the daughterboard and main circuit connected (hopefully

you’ve used a 6-way ribbon cable for extra simplicity and neatness), there are only six wires to connect as

shown below.

Drilling template

Hammond 1590BB

91 x 116 x x 31mm

The Gimp

Recommended drill sizes:

Pots 7mm

Jacks 10mm

Footswitch 12mm

DC Socket 12mm

Toggle Switch 6-7mm

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

enclosure be ore drilling. You use this template at your own risk.

Pedal Parts Ltd can accept no responsibility or incorrect drilling o enclosures.

PedalParts.co.uk

30mm

60mm

30mm

It’s a good idea to

drill the holes or

the pots 8mm to

give yoursel some

wiggle room unless

you’re a drill ninja

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