BOSS CE 2

Corrrral Chorus
Rev.1.Oct.12.2005
Build the Boss CE2 circuit on this layout. The FET switching has been removed to use true bypass
switching. Off board components except for the potentiometers are not shown on the layout.
Trademarks are property of their owners.
VR1
VR2
+
C5
R8
R15
R20
R22
C17
R6
Layout and presentation by Francisco Peña 2001-2005®.
All rights reserved. Authorization for personal use only,
any commercial use is forbidden.
Permission for posting/serving limited to
http://www.tonepad.com
Permission refused for posting from other sites.
OUT
R23
½
MOC.DAPENOT
R24
C16
R26
C15
C3
R4
R7
C2
LARROC
1
+
R21
IC1
R1
R3
C13
R25
R27
R28
C18
+
R2
1½
Q3
Q2
C4
R5
Q1
Rin
C1
GND
IN
R33
D7
R12
C7
C6
C8
R11
R10
R9
R13
Q5
2
R17
R16
C14
C12
R18
D2
R40
R37
R52
R14
C10
C11
R19
C29
C22
R38
D1
+
IC3
C9
+
R39
IC4
C30
R29
Q4
C21
+
2½
C20
R31
DEPTH
R34
R35
+9V
C19
IC2
RATE
R32
R36
R30
3
5002PF
0
LAYOUT
R52
0
½
1
1½
2
READY TO TRANSFER
AC
+
ADAPTOR
9v
D7
C29
C30
C16
C4
R24
INPUT
R4
R6
R21
C1 R1
C15
R23
Q1
C2
C3
R5
2
R22
8
IC1a
6
1
IC1b
3
R
R2
R3
5
R7
R25
7
C17
4
OUTPUT
R26
Vb
R14
Vb
Vb
C5
R9
R10
R11
3
1
7
8
IC3 - MN3007
5
2
6
4
Q2
R13
R8
C6
C7
C8
C10
R16
R17
R18
Q3
R15
Vb
C11
C12
C14
C13
Vb
R12
R19
3
4
2
8
IC4 - MN3101
1
7
5
R20
C9
Vb
C22
R38
R29
R40
D2
C19
R30
R27
3
R33
8
IC2a
2
R34
C20
R32
D1
6
1
IC2b
3
VR1
1
RATE
R31
5
2
R39
Q5
7
Q4
3
4
VR2
1
DEPTH
2
3
VR3
trim.1
R35
Vb
2
R36
C21
R37
R28
C18
Corrrral Chorus
Rev.1.Oct.12.2005
Parts list and some mods, these mods will require soldering to flying component leads and
components directly soldered to switches. Off board components except for the potentiometers are
not shown on the layout. Trademarks are property of their owners.
THE VIBRATO MOD
EFFECT LEVEL MOD
Lift one side of R21 and add a SPST switch like this:
Effect level can be made adjustable by adding a 250k
rev. Log. potentiometer in series with R22, this mod
along with the Wet Bass mod are needed to convert
to CE2B (for bass) specs.:
C16
R24
R21
C16
C15
R23
SPST
R24
R22
R21
6
IC1b
5
7
R25
C15
R22
4
Vb
3
250K-C
E.LEVEL
R23
6
IC1b
2
5
1
7
R25
4
Vb
WET BASS SWITCHING MOD
This mod modifies bass response on the modulated
signal. This mod along with the Effect Level Mod are
needed to convert the pedal to CE2B (for bass) specs. It
also can be used on its own. Change C14 to 0.012µF,
then add another another capacitor as shown:
CHORUS INTENSITY CAP SWITCH MOD
This mod is for altering the value of the C22 in order to
get a deeper chorus intensiy. Use a SPST switch and a
47pF (or other value, experiment!) capacitor wired like
this:
C14 (changed to 0.012µF)
C22
0.022
Capacitor
SPST
Resistors
R1 - 1K
R2 - 470K
R3 - 10K
R4 - 47K
R5 - 10K
R6 - 47K
R7 - 10K
R8 - 100K
R9 - 10K
R10 - 10K
R11 - 10K
R12 - 10K
R13 - 4.7K
R14 - 56K
R15 - 330K
R16 - 10K
R17 - 10k
R18 - 10K
R19 - 10K
R20 - 1Meg
R21 - 47K
R22 - 47K
SPST
Parts List
R23 - 10k
R24 - 47k
R25 - 470 ohm
R26 - 100k
R27 - 4.7k
R28 - 4.7k
R29 - 33k
R30 - 47k
Transistors
Q1 - 2N5088
Q2 - 2N5088
Q3 - 2N5088
Q4 - 2N5088
Q5 - 2N5088
Potentiometers
VR1 - 100k Lin.
VR2 - 100k Lin.
R31 - 10k
R32 - 1Meg
R33 - 10k
R34 - 10k
R35 - 220K
R36 - 4.7K
R37 - 4.7K
R38 - 150K
R39 - 33K
R40 - 2.7K
R52 - 33 ohm
ICs
IC1 - 4558
IC2 - TL022
IC3 - MN3007
IC4 - MN3101
Trim Pots
VR3 - 10k
Capacitors
C1 - 0.047µF
C2 - 0.47µF
C3 - 0.0068µF
C4 - 100pF
C5 - 0.033µF
C6 - 0.0033µF
C7 - 0.0082µF
C8 - 470pF
C9 - 1µF
C10 - 0.033µF
C11 - 0.0033µF
C12 - 0.0082µF
C13 - 470pF
C14 - 0.033µF
C15 - 0.0068µF
C16 - 100pF
C17 - 1µF
C18 - 47µF
C19 - 0.1µF
C20 - 47µF
C21 - 0.01µF
C22 - 47pF
C29 - 100µF
C30 - 220µF
Diodes
D1 - 1N914
D2 - 1N914
D7 - RD11EB