FuzzDog Harmonic Percolator V3 User manual

Harmonic Percolator V3
Your very own clone
of the Interfax H -1
Contents of this document are ©2015 edal arts Ltd.
No reproduction permitted without the express written
permission of edal arts Ltd. All rights reserved.

Schematic + BOM
BOM
R1 750K
R2 220K
R3 91K
R4 91K
R5 4K7
C1 100p silver mica
C2 47n greencap
C3 100n ceramic
C4 47u tantalum
C5 100n ceramic
Q1 2N404
Q2 2N3565
D1,2 Germanium
(1N695, 1N60 , 1N34A etc)
1 100KA (Harmonics)
2 50KA (Balance)
SW1 is an optional S DT toggle switch to take the diode clipping section in or out of the
circuit. Taking them out gives a crunchier sound and much louder output. To build the
circuit stock without the switch, just leave it out and put a jumper wire between pads S1
and S2. Ignore the two holes above S1 and S3 - these are locator holes if you’re using a
micro-toggle.

The power and signal pads on the CB 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, transistors and LED 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).
The glass case on the germanium diodes is very delicate and can be easily cracked. Use some
needle-nosed pliers to hold the leg, right up against the glass casing. Now bend the leg to 90° with
your fingers. The pliers will prevent strain where the leg meets the case.
If you have a 2N3565 in a TO-106 case (which looks like a small black pill with a rounded
top - see left), the emitter is the leg next to the small flattened edge. This should go into
the pad marked in red above. A standard TO-92 case version should mount with the flat
edge as shown on the CB.
The striped leg (cathode) of the diode go into
the square pad.
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.
The toggle switch can mount on either side of
the board, depending how far you want it to be
from the pots. If you’re using a normal, wired
toggle switch, connect pad S2 to the centre
lug, S1 and S3 to the outer lugs.
CB Layout ©2015 edal arts Ltd.

Test the board!
UNDER NO CIRCUMS ANCES will troubleshooting help
be offered if 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. 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.
UO
YRET
T
A
AT
B
NI
TU
GND
9V
IN
S
T
UDING WIRED PO
INCL
cuit boa
w cir
e, ne
our nic
Y
o
NI
OUT
!!!!
d
ar
TUO

(if using a daughterboard please refer to the relevant document)
Wire it up - DC only version
This circuit is standard, Negative GND. Your power supply should be
Tip Negative / leeve Positive. That’s the same as your standard pedals
(Boss etc), and you can safely daisy-chain your supply to this pedal.
The BOARD GND connections don’t all have to connect to one point.
They can be daisy-chained around the circuit, using larger connection
points (such as jack socket lugs) for multiple connections. As long as
they all connect together in some way.
L
E
D
BOARD
OUT
BOARD
9V
BOARD
GND
BOARD
GND
BOARD
GND
BOARD
INPUT
+
IN
OUT
L
E
D
BOARD
GND
BOARD
LED+

(if using a daughterboard please refer to the relevant document)
Wire it up - with battery
This circuit is standard, Negative GND. Your power supply should be
Tip Negative / leeve Positive. That’s the same as your standard pedals
(Boss etc), and you can safely daisy-chain your supply to this pedal.
The BOARD GND connections don’t all have to connect to one point.
They can be daisy-chained around the circuit, using larger connection
points (such as jack socket lugs) for multiple connections. As long as
they all connect together in some way.
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+
+
Just because the
FuzzDog enclosure
won’t take a battery,
there’s nothing
stopping you using a
bigger box.

Drilling template
Hammond 1590B
60 x 111 x 31mm
Harmonic ercolator
Micro Toggle Switch
Recommended drill sizes:
Pots 7mm
Jacks 10mm
Footswitch 12mm
DC ocket 12mm
witch 5mm
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.
PedalParts.co.uk
It’s a good idea to drill the holes for the pots 8mm to give
yourself some wiggle room unless you’re a drill ninja
Top hole is for switch
mounted on same side of
the PCB as the pots.
Bottom one if mounting
on the other side.
32mm
8mm
19mm

Drilling template
Hammond 1590B
60 x 111 x 31mm
Harmonic ercolator
Standard Toggle Below
Recommended drill sizes:
Pots 7mm
Jacks 10mm
Footswitch 12mm
DC ocket 12mm
witch 6mm
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.
PedalParts.co.uk
It’s a good idea to drill the holes for the pots 8mm to give
yourself some wiggle room unless you’re a drill ninja
witch needs to be that low
to avoid touching
components on the PCB.
ee next page if that’s
too low for you.
32mm
25mm

Drilling template
Hammond 1590B
60 x 111 x 31mm
Harmonic ercolator
Standard Toggle Above
Recommended drill sizes:
Pots 7mm
Jacks 10mm
Footswitch 12mm
DC ocket 12mm
witch 6mm
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.
PedalParts.co.uk
It’s a good idea to drill the holes for the pots 8mm to give
yourself some wiggle room unless you’re a drill ninja
witch can be mounted
above the pots to avoid
contact with other
components
32mm
6mm