FuzzDog DeathDrive User manual

De th Drive
Octave-up into Rat into
boost for doomy destruction
Contents of this document are ©2019 Pedal Parts td.
No reproduction permitted without the express written
permission of Pedal Parts td. All rights reserved.

Important notes
If you’re using ny of our footswitch d ughterbo rds,
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 imiting Resistor (C R) 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 c p citors:
ong leg (anode) to square pad.
•Diodes/LEDs:
Striped leg (cathode) to square pad. Short leg to square pad for EDs.
•ICs:
Square pad indicates pin 1.

R1 1M
R2 1K
R3 1M
R4 10K
R5 470K
R6 47K
R7 10K
R8 2K2
R9 22K
R10 10K
R11 100K
R12 100K
R13 47K
R14 47K
R15 10K
R16 1M
R17 1K
R18 470K
R19 470K
R20 470R
R21 10K
R22 1M
R23 10K
R24 10K
R25 1K
R26 560R
R27 47R
R28 1K
R29 1K5
R30 1M
R31 10K
C1 100p
C2 100n
C3 100n
C4 100n
C5 100n
C6 1u elec
C7 1u elec
C8 10u
C9 100p
C10 1u‡
C11 22n
C12 1n
C13 33p
C14 100n
C15 100p
C16 4u7 elec
C17 2u2 elec
C18 4u7 elec
C19 1u elec
C20 3n3
C21 22n
C22 10u elec
C23 100u elec
IC1 OP07*
Q1 2N5457**
Q2 2N5089
Q3 2N5087
Q4 2N5089
Q5 2N5457**
Q6 BS170
D1-2 Ge***
D3 1N4148
D4 3mm Red ED
D5-7 1N4148
D8 1N4001
VO 100KA
DIST 100KA
FI T 100KA
OCT 50KB
BOOS 100KA
S1 SPDT ON-OFF-ON
Schematic
+ BOM
*Original is M308. Other single op-amps will work.
**Original is PF5102. Other N-channel FETs work in these buffer sections, and will have
very little or no impact on tone. Pads are included for through-hole or SMT FETs.
***We supply D9K which have the stipes at the anode rather than cathode. These don’t even
need to be germanium - 1N4148 work fine. They need to be matched for forward voltage.
These need to be reversed when pl ced in the PCB, i.e. c thode to squ re p d.
‡C10 is 1u on the original. We haven’t allowed a large space for that on the PCB, so if you
want to use this value you’ll need a small format part, such as M CC. There’s really no need
to have such a big value in there. Use anything from 100n - 1u.
Bigger, legible version
on next page.
Based on the trace
by Bugg

Two of 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. The optional Octave-
Bypass pads need to be wired differently, but a
daughterboard can still be used.
Be very careful when soldering the transistors
and diodes. They’re very sensitive to heat. Keep
exposure to heat to a minimum (under 2
seconds) and leave a few seconds between
soldering each leg. Same goes for the IC if you
aren’t using a socket.
The BS170 is very sensitive to static - handle
with care.
The glass case on the Ge transistors is very
delicate. Take care when bending the legs. Hold
a the leg right up against the body with some
small needle-nosed pliers to take the strain,
and bend the leg with your finger.
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. Same for the toggle switch. 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.
Snap the small metal tag off the pots so they
can be mounted flush in the box.
PCB layout ©2019 Pedal Parts td.

Initial wiring
USE WIRES! Our ribbon c bles re unlikely to be of ny
use unless you’ve compromised your enclosure l yout to
line up the p ds to d ughterbo rds.
If you aren’t going to use a footswitch to engage/bypass the OCTAVE section of the
circuit, add a jumper as shown below.
...otherwise add wires to all five of those pads. OV is for +supply, OG is ground.
O1 is Octave Bypass
O2 is the input to the Distortion section
O3 is Octave Out
Add long wires to the other two sets of pads for offboard wiring.
BOOST OCTAVE DISTORTION

Testing
You c n test the Distortion nd Boost sections
individu lly, s if they’re sep r te bo rds. Do the test
wiring s shown below for e ch section.
UNDER NO CIRCUMSTANCES will troubleshooting help
be offered if you h ve skipped this st ge. No exceptions.
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!
You’ll have to connect the wire from pad O2 to either O1 or O3, or you’ll get no signal from the
Distortion section.
There’s no need to connect power to the OV and OG pads - these are purely to supply power to an
ED if you’re adding the Octave footswitch.
If you have a circuit tester (we sell a few!) just use that as normal.
Your completed circuit bo rd
including pots

Wire it all up
The im ge below ssumes you’re using n Oct ve Byp ss footswitch. If not
just le ve th t out, h ving dded the jumper shown e rlier in this document.
You should also connect OV and OG to V and G on the Octave daughterboard, we just
left them out of the image as it would get messy. The wiring shown will light up the
ED when Octave is engaged.
INOUT
Please refer to the separate daughterboard document for further info regarding the
current limiting resistors and EDs. The DC socket can connect to any of the three
daughterboards.
See next page for more info if you’re building a 1590BB, two switch version.

Keeping up appearances...
On the bigger box versions of this kit, the LEDs ll sit to the s me side of the
footswitches. However, th t would look decidedly weird on the two switch,
1590BB version.
To keep things sweet you’ll have to flip the Distortion side daughterboard over before
soldering in the footswitch and ED. That way the ED can still sit in the
daughterboard and line up with the hole.
Everything will function exactly the same, you’ll just have wires twisted around
between the boards. Keep them slack and you’ll have no issues.

On/Offboard wiring
We designed the bo rd to fit nicely in 1590BB with ll controls mounted on
the PCB. Using bigger enclosure me ns some pots need to be wired
offbo rd.
The images on the next two pages show which pots need to be wired. You may need
to bend the legs down to ensure they don’t touch the PCB in some places.