NP Electronics Fuzz Face User manual

Fuzz Face
Original Version (PNP) Components
To use a PNP Fuzz Face with a normal 9V power supply, you need to include the power inverter
section which is C1, C8, C9, D1 and IC1 which is generates the -9V required. Unless you know
what you're doing and have a positive ground PSU, you should use all these components,
otherwise omit them and solder a jumper between J1 and J2. (Do NOT connect the jumper if
using the power inverter or you will get a short circuit). !
Adjust Q2 BIAS until you get the sound you like. You can use a multimeter to measure the voltage
between the collector on Q2 and GND and it should be around 4.5V!
NPN Version Components
C4 and C5 cut out some high frequency noise, you can use different value ceramic capacitors
here and higher ones will cut out more of the high end but might affect your tone. 100pF is
considered a good value to start with. Solder a jumper between J1 and J2!
Adjust Q2 BIAS until you get the sound you like. You can use a multimeter to measure the voltage
between the collector on Q2 and GND and it should be around 4.5V!
CHECK ELECTROLYTIC CAPACITORS!
If you are building the NPN version, the polarity of C6 and C7 need to be reversed from what is
printed on the board, so put the negative leg in the hole with a +!
C1
10uF Electrolytic
R1
470 OHM
FUZZ
1K Linear
C3
10nF
R2
33K
VOLUME
500K Log
C4
Empty
R3
100K
C5
Empty
R4
Jumper
Q1, Q2
PNP Germanium Transistor
C6
22uF Electrolytic
C7
2u2 Electrolytic
Q1 BIAS
Connect pins 2
and 3
D1
1N4148
C8
10uF Electrolytic
Q2 BIAS
20K Trimmer
D2
1N4001
C9
100uF Electrolytic
IC1
7660S
C1
Empty
R1
470 OHM
FUZZ
1K Linear
C3
10nF
R2
33K
VOLUME
500K Log
C4
47pF – 470pF
R3
100K
C5
47pF – 470pF
R4
Jumper
Q1, Q2
BC108 (or experiment with
NPN transistors)
C6
22uF Electrolytic
C7
2u2 Electrolytic
Q1 BIAS
Connect pins
2 and 3
D1
Empty
C8
Empty
Q2 BIAS
20K Trimmer
D2
1N4001
C9
Empty
J1 + J2
Jumper
IC1
Empty

Fuzz Face
Transistor Pinouts
Looking at the top of the board, the pinout for the transistors is:!
C: Collector!
B: Base!
E: Emitter!
Trimmers and Jumpers
Where a component is listed as jumper, solder a piece of wire between the pads to make a
connection. Where Q1 BIAS is not used, you should put a jumper between pins 2 and 3 like the
diagram below:!
Where a trimmer is used, as for biasing Q2, the PCB is
designed to fit this style of trimmer: !
Board Connections
The PCB connections are labelled as the following:!
I - Input, O - Output, V - 9V DC in, G - Ground!
Potentiometers are connected from pin 1 to the square pad on the PCB. This board was designed
so you can use right-angle board mount potentiometers on it if desired, otherwise you will need to
solder wired from the pads to the correct pin/lug. Jack sleeves and DC centre pin should be
connected to ground. V, LED + should be connected to the positive pin of the DC connector.
1 #2# # 3
Board GND!
Board In!
Input Jack Tip!
LED –
Output Jack Tip!
Board Out!
3PDT Footswitch
B
C
E