FuzzDog Amber Chuck V4 User manual

Amber Chuck V4
JTM45 in-a-box
Contents of this document are ©2018 Pedal Parts Ltd.
No reproduction permitted without the express written
permission of Pedal Parts Ltd. All rights reserved.

Important notes
If you’re usin any of our footswitch dau hterboards,
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.
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:
Striped leg (cathode) to square pad.
•ICs:
Square pad indicates pin 1.

Schematic + BOM
R1 1M
R2 100
R3 62
R4 10M
R5 2 7
R6 2 7
R7 470
R8 1M
R9 1M
R10 5 1
R11 180R
R12 1M
R13 1M
R14 5 1
R15 330R
R16 6 8
R17 2 2
R18 6 8
R19 68
R20 2 2
R21 15
R22 10
R23 47
R24 91
R25 10
R26 10
R27 22
R28 22
C1 22n
C2 100n
C3 470p
C4 22n
C5 47n
C6 10n
C7 2n2
C8 10n
C9 10n
C10 1n
C11 1n
C12 10u elec
C13 10u elec
C14 10u elec
C15 100n
C16 100u elec
C17 100u elec
C18 100u elec
IC1 TL072
Q1-3 BS170
D1 9.1V zener
D2 1N4001
DRV 10 C
VOL 100 A
BASS 25 B
MID 25 B
TREB 25 B

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.
Be very careful when soldering the diodes 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. eep exposure to heat to a
minimum (under 2 seconds). Same goes for the
IC if you aren’t using a socket.
Snap the small metal tag off the pots so they
can be mounted flush in the box.
Positive (anode) legs of the electrolytic caps go
to the square pads.
Negative (cathode) legs of the diode goes to the
square pad.
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. 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.
PCB layout ©2018 Pedal Parts Ltd.

Test the board!
UNDER NO CIRCUMSTANCES will troubleshootin help
be offered if you have skipped this sta e. No exceptions.
Once you’ve finished the circuit it makes sense to test is 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.
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!
If it works, carry 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.
BATTERY
IN OUT
Your nice, new circuit board
INCLUDING WIRED POTS!!!!
IN 9V GND OUT

Wiring shown above will disconnect the battery when you remove the jack plug
from the input, and also when a DC plug is inserted.
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.
This circuit is standard, Negative GND. Your power supply should be Tip
Negative / Sleeve Positive. That’s the same as your standard pedals (Boss etc),
and you can safely daisy-chain your supply to this pedal.
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
+
Wire it up (if using a daughterboard please refer to the relevant document)

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
Drillin template
Hammond 1590B
60 x 111 x 31mm
It’s a ood idea to drill the pot and
to le switch holes 1mm bi er if
you’re board-mountin them.
Wi le room = ood!
Recommended drill sizes:
Pots 7mm
Jacks 10mm
Footswitch 12mm
DC Socket 12mm
27mm
35mm
17.5mm