FuzzDog FY2 User manual

FY2
Shin-ei FY2 Companion Fuzz
with LPB post-boost
PedalParts.co.uk

Schematic
BOM
R1 2M2
R2 22K
R3 1M2
R4 47K
R5 10K
R6 15K
R7 100K
R8 1M
R9 470K
R10 47K
R11 10K
R12 390R
R13 100K
R14 CLR (2K2)
C1 47n
C2 1n
C3 47n
C4 2n2
C5 3n3
C6 1n
C7 100n
C8 47n
C9 10u
C10 10u
C11 100u
Q1,2 Low gain
silicon NPN
(2N3904,
2N2222 etc)
Q3 2N3904
VOL 50KB
FUZZ 50KB
Components shown in blue on the schematic are the LPB
post-boost circuit. Feel free to leave them out and take your
OU wire from pin 2 of the VOL pot rather than wire it to the
board. Warning: your output will be low.

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 should use some kind of heat sink on the
legs of the transistors and diodes when
soldering. hey aren’t keen on heat. Any
more than 3-4 seconds of iron and they’re toast.
Recommended assembly order:
Resistors, Caps, ransistors, , Wires, Pots
I’ve incorporated the Current Limiting Resistor for the
LED into the board for your pleasure.
Post Boost..??
he board incoporates a LPB circuit as a post-boost to
raise the signal level. he FY2 has a very low output, and
this makes it much more friendly without colouring the
sound at all.
1 2 3

Test the board!
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 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

ire 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.
his circuit is standard, Negative GND. Your power supply should be ip
Negative / Sleeve Positive. hat’s the same as your standard pedals
(Boss etc), and you can safely daisy-chain your supply to this pedal.
Now... FFFUUUUUZZZZZZZZZ!
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+
+