FuzzDog Big Skweez User manual

Big Skweez
Or nge Squeezer
Compressor Clone
PedalParts.co.uk

Schem tic
BOM
R1 4M7
R2 82K
R3 470K
R4 470K
R5 2K4
R6 470K
R7 390K
R8 220K (200K)
R9 10K
R10 1K5
R11 100K
R12 2K2
C1 47n
C2 47n
C3 2n2
C4 4u7
C5 4u7
C6 4u7 (1u)
C7 4u7 (10u)
C8 47u
D1 1N4148
D2 1N4001
Q1 2N5457
Q2 2N5457
IC 4558
SUST10K trim
VOL 10KA
P rts m rked in blue
re mods for b ss

**NO E: diodes in the cover image are switched - sorry about that!
Wiring shown overleaf will disconnect the battery when you remove
the jack plug from the input, and also when a DC plug is inserted.
Snap the little metal tag off the pot to mount it flush in the box.
You MUS use some kind of heat sink on the legs of the LED and
the transistors when soldering. Also be very
careful if you’re soldering the IC directly to the
board rather than using the socket. hey
aren’t keen on heat. Any more than a couple
of seconds of iron and they’re toast.
Recommended assembly order:
Resistors, IC Socket, Caps, Diodes,
ransistors, Pot, Wires
Adjust the sustain trimmer until you get a satisfactory balance
between compression and distortion.
1 2 3

Test the bo rd!
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.
Solder some nice, long lengths of wire to the board connections for
9V, GND, IN, OU . Connect IN and OU 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, HEN worry about the switch etc.
YRET
T
A
AT
B
NI UO TU

Wire it up
he 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 OU jack.
It doesn’t matter how they all connect, as long as they do.
PedalParts.co.uk
L
E
D
BOARD
OUT
BOARD
9V
BOARD
GND
BOARD
GND
BOARD
GND
BOARD
INPUT
BATTERY
+
IN
OUT
L
E
D
BOARD
GND
BOARD
LED+
+