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5

BIG MUFF PI / HALO FUZZ

Schematic

Besides the pots, no part 

values are shown on this 

schematic as every variant is 

vastly different.

See variant parts lists above 

for values.

GN

D

GND

GND

GND

GN

D

GND

GND

GND

D

N

G

D

N

G

GND

GND

100

R

100u

F

1N4001

100kB

100kB

25k

B

100kA

+9V

GND

4k7

IN

+9V

OUT

RPD

R2

R3

R4

6 R

5 R

R7

R8

R9

R10

2 1 R

1 1 R

R13

R14

R15

7 1 R

6 1 R

R18

R19

R20

R21

R22

R23

R24

C1

C2

C3

C4

C7

D1

D2

C5

C6

C8

C9

D4

D3

C10

C

11

C12

C13

C14

D5

C15

3

Q

2

Q

1

Q

Q4

SUS

1

2

3

TON

E

1

2

3

MI

D

1

2

3

VO

L

1

2

3

C10

1

R101

LE

DR

LE

D

SW

Summary of Contents for Halo Fuzz

Page 1: ...the standard bipolar transistor gain stage I don t know how big of a difference this makes in the overall sound but it can be fun to play around with and can be added to any variant To use this inclu...

Page 2: ...0pF C6 100n C7 100n C8 470pF C9 100n C10 4n C11 10n C12 100n C13 100n C14 100uF C15 100n Resistors cont R18 39k R19 39k R20 390k R21 100k R22 12k R23 2k7 R24 100R Semiconductors Q1 Q4 2N5088 D1 D4 1N9...

Page 3: ...C2 430pF C3 100n C4 100n C5 430pF C6 47n C7 100n C8 430pF C9 47n C10 3n9 C11 10n C12 100n C13 100n C14 100uF C15 100n Capacitors C1 1uF C2 470pF C3 47n C4 1uF C5 470pF C6 1uF C7 1uF C8 470pF C9 1uF C...

Page 4: ...0n C13 1uF C14 100uF C15 100n C101 10uF Resistors cont R18 22k R19 22k R20 omit R21 68k R22 14k7 R23 6k8 R24 100R R101 2k Semiconductors Q1 Q3 BC550C Q4 2N5485 D1 D2 2N3819 D3 D4 1N914 Resistors R2 33...

Page 5: ...e for values GND GND GND GND GND GND GND GND D N G D N G GND GND 100R 100uF 1N4001 100kB 100kB 25kB 100kA 9V GND 4k7 IN 9V OUT RPD R2 R3 R4 6R 5R R7 R8 R9 R10 21R 11R R13 R14 R15 71R 61R R18 R19 R20 R...

Page 6: ...ut now the PCB is custom fit to that particular enclosure 6 Wire everything according to the wiring diagram on the last page 1 For the LED You can use a bezel if you d like but generally it s easier j...

Page 7: ...ut the holes as shown and then step up until they are the correct size for the components Note that the TONE pot has two possible orientations depending on whether you use the Midrange pot or not The...

Page 8: ...e PCB for your particular project they are not always in the order shown here IN GND OUT SW 9V SLEEVE TIP TIP License Usage No direct support is offered for these PCBs beyond the provided documentatio...

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