FuzzDog Rodent Bedienungsanleitung

Rodent

Gnawingly-good distortion

with switchable clipping

No reproduction permitted without the express written

Schematic

BOM

R1 1M

R2 1K

R3 560R

R4 47R*

R5 1K

R6 1K5

R7 1M

R8 10K

R9 47R

R10 10K

R11 10K

R12 1M

C R 2K2

C1 22n

C2 1n

C3 100p

C4 33p

C5 4u7

C6 2u2

C7 4u7

C8 3n3

C9 22n

C10 1u

C11 100u

C12 47u

C13 47n

Q1 2N5458

IC M308N

or OP07

D1 1N4001

FI T 100KA

DIST 100KA

VO 100KA

RESP 1KB

D2,3 1N4148

D4,5 3mm Red ED

D6 1N4148**

* R4 goes in place of the RESPONSE pot if you’re going stock without the Ruetz mod.

See next page.

**C IPPING DIODES - see next page

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.

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, along with the toggle switch. You can use a

vertical-mount pot or just wire up ‘normal’ ones.

The striped leg (cathode) of the diode goes into the square pad.

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

the square pads.

RUETZ / RESPONSE MOD

The Ruetz mod flattens the frequency response of the circuit and gives you extended but

tight low end. You can simply leave out R4 and C6 if you want to have this non-adjustable

and permanent. However, its more rewarding to make it adjustable. To do this add either

the RESPONSE pot (1KB) or put a 1K trimmer in T1. Now twiddle until you get the result

you want.

To make a stock circuit without the mod,

place R4 (47R) across the RESPONSE

pads like this:

1 2 3

C IPPING DIODES

There are two sets of clipping diode pads on the board, along with pads for an optional

clipping selection switch.

Stock clipping:

Standard Rodent: D2-3 1N4148

Turbo Rodent: D4-5 3mm Red EDs

You Dirty Rodent: D2-3 1N34A

Notice there’s an extra spot - D6. You can add an extra diode along with

D2-3 to get asymetrical clipping. It doesn’t have to be 1N4148. Mix and match.

Experiment with different diode combinations in any of the spots and find your own

favourite.

NOTE: YOU MUST PUT A JUMPER WIRE ACROSS D6

IF YOU AREN’T USING IT FOR A DIODE.

If you’re using the diode selection switch, just put a

SPDT ON-ON switch in there. If you’re making a 3-

knob version you can’t put the switch directly into the

pads - you’ll have to wire it offboard and place it as

shown >>>

HARD WIRING A SING E C IPPING OPTION

If you want to dispense with the clipping switch you’ll have to place a jumper wire across

the switch pads, depending on which set of diode pads you’re using.

RED for D4-5

B UE for D2-3(-6)

POT CONFIGURATIONS

There are two spots for the FI TER pot. Use one or the other depending on

whether you’re making a 3 or 4 pot version.

The filter control works backwards

in the three-pot configuration,

with the tone becoming brighter

when turned clockwise (which actually

makes much more sense to us,

but whatever). If you want

it as per the original you’ll have

to wire the pot in reverse and

use a reverse log taper.

NOTE: The above onl applies if

our PCB has round holes fo

the toggle switch. This has

been fixed on boards with slots.

Test the board!

UNDER NO CIRCUMSTANCES will troubleshooting help

be offered if you have skipped this stage. No ex eptions.

On e you’ve finished the ir uit it makes sense to test is before

starting on the swit h and LED wiring. It’ll ut down

troubleshooting time in the long run. If the ir uit works at this

stage, but it doesn’t on e you wire up the swit h - guess what?

You’ve probably made a mistake with the swit h.

Solder some ni e, long lengths of wire to the board onne tions for

9V, GND, IN and OUT. Conne t IN and OUT to the ja ks as shown.

Conne t all the GNDs together (twist them up and add a small

amount of solder to ta k it). Conne t the battery + lead to the 9V

wire, same method. Plug in. Go!

If it works, ra k on and do your swit h wiring. If not... aw man.

At least you know the problem is with the ir uit. Find out why, get

it working, THEN worry about the swit h et .

BATTERY

IN OUT

Your nice, new circuit board

INCLUDING WIRED POTS!!!!

IN 9V GND OUT

(if using a daughterboard please refer to the relevant document)

Wire it up - DC only version

This circuit is stan ar , Negative GND. Your power supply shoul be

Tip Negative / Sleeve Positive. That’s the same as your stan ar pe als

(Boss etc), an you can safely aisy-chain your supply to this pe al.

The BOARD GND connections on’t all have to connect to one point.

They can be aisy-chaine aroun the circuit, using larger connection

points (such as jack socket lugs) for multiple connections. As long as

they all connect together in some way.

BOARD

OUT

BOARD

GND

BOARD

GND

BOARD

GND

BOARD

INPUT

OUT

BOARD

GND

BOARD

LED+

(if using a daughterboard please refer to the relevant document)

Wire it up - with battery

This circuit is stan ar , Negative GND. Your power supply shoul be

Tip Negative / Sleeve Positive. That’s the same as your stan ar pe als

(Boss etc), an you can safely aisy-chain your supply to this pe al.

The BOARD GND connections on’t all have to connect to one point.

They can be aisy-chaine aroun the circuit, using larger connection

points (such as jack socket lugs) for multiple connections. As long as

they all connect together in some way.

Pe alParts.co.uk

Just because my pre- rille

enclosure oesn’t

accommo ate a battery, it

oesn’t mean you can’t a

one yourself in a bigger box.

Follow this!

BOARD

OUT

BOARD

GND

BOARD

GND

BOARD

GND

BOARD

INPUT

BATTERY

OUT

BOARD

GND

BOARD

LED+

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