FuzzDog ToxicMinx V2 User manual

Toxic Minx V2
Distortion+/OD250
with clipping mods
Contents of this document are ©2015 Pedal Parts Ltd.
No reproduction permitted without the express written
permission of Pedal Parts Ltd. All rights reserved.

mportant notes
I you’re using any o our ootswitch daughterboards,
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:
•Electrolytic capacitors:
Long leg (anode) to square pad.
•Diodes/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 10K
R3 1M (22K)
R4 1M (22K)
R5 1M (470K)
R6 1M
R7 4K7
R8 10K
C1 10p* (empty)
C2 10n
C3 47n
C4 10p (22p)
C5 1n
C6 10u elec
C7 1u elec (4u7)
D1 Jumper**
D2 1N4148
D4 1N4148
D5-6 3MM LED***
C1 LM741
GA N 500KC‡
VOL 50KA (100KA)
BOM shows Distortion+. Values in blue should be substituted for OD250.
*Lots of conflicting info on schematics out there for this value. A lot of them show 1n, but that’ll
suck a lot of top end. By all means do that, but we prefer to keep it small and retain the top.
We’ll supply 10p, 220p and 1n.
**You can add another 1N4148 in D1 if you want to see how the circuit sounds with asymetrical
clipping.
***Extra pads are provided for a second clipping option. See overleaf.
‡Originally 1MB, but the sweep is terrible. 500KC is much more useable.

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.
Be very careful when soldering the diodes. 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). You should use a socket for the C, or
be super careful not to overheat. Take your time.
The striped leg (cathode) of the diodes go into the square pads. Long leg (anode) of the LEDs
go into the round pads.
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.
CL PP NG
f you’re going for a single clipping option place a jumper across the appropriate pads. f you’re
utilising D1, 2 and 4 then connect pads 1 & 2. f you’re using D5-6 connect pads 2 & 3.
You can have two clipping options on the board at the same time, using a SPDT toggle switch
to select between them. Just wire it up with pad 2 going to the centre lug, 1 and 3 going to the
outer lugs.
The circuit can sound vastly different depending on your diode selection. Experiment.
Germaniums will typically give a much softer clip. LEDs will be harder. You don’t have to put
LEDs into D5 and D6 - you could put normal diodes in there positioned upright.
PCB Layout ©2015 Pedal Parts Ltd. All rights reserved.

Test the board!
Check the relevant daughterboard document or more
in o be ore you undertake this stage.
UNDER NO CIRCUMSTANCES will troubleshooting help
be o ered i you have skipped this stage. No exceptions.
Once you’ve finished the circuit it makes sense to test is before starting on the switch and LED
wiring. t’ll cut down troubleshooting time in the long run. f 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, N and OUT. Connect
N 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!
f you’re using a ribbon cable you can tack the wires to the ends of that. t’s a lot easier to take them
off there than it is do desolder wires from the PCB pads.
f it works, carry on and do your switch wiring. f 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 completed circuit board
including pots

(if using a daughterboard please refer to the relevant document)
Wire it up - with battery
This circuit is st nd rd, Neg tive GND. Your power supply should be
Tip Neg tive / Sleeve Positive. Th t’s the s me s your st nd rd ped ls
(Boss etc), nd you c n s fely d isy-ch in your supply to this ped l.
The BOARD GND connections don’t ll h ve to connect to one point.
They c n be d isy-ch ined round the circuit, using l rger connection
points (such s j ck socket lugs) for multiple connections. As long s
they ll connect together in some w y.
L
E
D
BOARD
OUT
BOARD
9V
BOARD
GND
BOARD
GND
BOARD
GND
BOARD
INPUT
BATTERY
+
IN
OUT
L
E
D
BOARD
GND
BOARD
9V
+

Drilling templ te
H mmond 1590B
60 x 111 x 31mm
Recommended drill sizes:
Pots 7mm
J cks 10mm
Footswitch 12mm
DC Socket 12mm
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.
32mm
t’s a good idea to drill
the holes for the board-
mounted parts 1mm
bigger to give yourself
some wiggle room,
unless you’re a drill ninja

Drilling templ te - with switch
H mmond 1590B
60 x 111 x 31mm
Recommended drill sizes:
Pots 7mm
J cks 10mm
Footswitch 12mm
DC Socket 12mm
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
32mm
t’s a good idea to drill
the holes for the board-
mounted parts 1mm
bigger to give yourself
some wiggle room,
unless you’re a drill ninja
6mm