FuzzDog Rodent User manual

Rodent

Gnawingly-good distortion

with switchable clipping

PedalParts.co.uk

Schematic

B M

R1 1M

R2 1K

R3 560R

R4 47R

R5 1K

R6 1K5

R7 1M

R8 10K

R9 47R

R10 10K

R11 10K

R12 1M

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 LM308N

or P07

D1 1N4001

FILT 100KA

DIST 100KA

V L 100KA

D2,3 PAIR*

D4,5 PAIR*

*CLIPPING DI DES

There are lots of variations for these, but stock sets are:

Standard 1N4148

Turbo Red 3mm LEDs

Dirt Germanium (1N34A)

Switch selects between each pair, or you can hardwire a single pair by connecting

SW2 to either SW1 (D2,3) or SW3 (D4,5) with a jumper. Not a woolly one mind you.

Wiring shown overleaf will disconnect the battery when you

remove the jack plug from the input, and also when a DC

plug is inserted.

nap the little metal tag off the pot to mount it flush in

the box.

You MU T use some kind of heat sink on the legs of the

LEDs, diode and the transistors when soldering. Also be

very careful if you’re soldering the IC directly to the board

rather than using the socket. They aren’t keen on heat. Any

more than a couple of seconds of iron and they’re toast.

If you want to get really jiggy with it you can take a look at the Ruetz mods -

http://www.diyguitaramp.com/rat.html

Easy enough to implement and easily switchable too.

1 2 3

Diode selection

switch numbering

(viewed from bottom) >

Requires a PDT switch (ON-ON).

Test the board!

Once you’ve finished the circuit it makes sense to test it 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.

older some nice, long lengths of wire to the board connections

for 9V, GND, IN, 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 it works, crack 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.

Wire it up

The Board GND connections don’t all have to directly attach to

the board. You can run a couple of wires from the DC connector,

one to the board, another to the IN jack, then daisy chain that

over to the OUT jack.

It doesn’t matter how they all connect, as long as they do.

PedalParts.co.uk

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