wah.pdf

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Wah Wah
Rev.2.Nov.26.2004

VOL/WAH
VOL/WAH
VOL/WAH
VOL/WAH
GND
POT 3 (CCW)
POT 2 (WIPER)
POT 1 (CW)
GND
+9v
+9v

DPDT

A variety of wah circuits can be built on this board, component values are for the Cry Baby. Parts
outlined orange are for vol/wah mod, taken from the "Jen Wah-Vol Pedal" schematic. Input and output
FET buffers are added for flexibility and can be bypassed if desired. The board also provides pads for
different inductors. Some offboard components are not shown on the layout. Trademarks remain
property of their owners.

220k*
4u7
+

0.22

1
1uFNP

0.22

0.01
470k

G

1M
1k5
6k8
22k
470

0.22

220k

Q4

G

10k
4k7
470k

0.05
Q2

HAWHAW

1 1/2

GND
OUT

Q1

3002 PF

1k5
Q3

47uF

0.01
1M
68k
33k
82k

+
+

GND
IN

1/2

1M
4k7
1k

MOC.DAPENOT.WWW

0

0

1/2

1

1 1/2

2

Layout and presentation by Francisco Pe?a 2001 - 2004(R).
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.

2
1k
D1

READY TO TRANSFER
NOTES:
* use a jumper if not implementing the
vol/wah switch
** Jumper if not adding "Q" control

1k
AC
ADAPTOR

D1

.05
Q4

47uF
1uF

9v

+

1M

4k7

100k

22k
1k

.22
6k8
.01

68k
Q1

INPUT

470k

470k

1
100k
3

2 .22
Q2

1

Q3

1M

1k5

470

550mH

33k

82k

4.7uF

10k

4k7

2
1k5
.22
100k**
1M

5k
220k*

220k

.01

OUTPUT

Wah Wah
Rev.2.Nov.26.2004

Parts list for stock cry baby wah and mods for volume pedal (Jen Wah) and input/output buffers. Use
the schematic as a guide and perform the desired mods or leave stock. All trimpots can be regular
pots. Trademarks remain property of their owners.

Aditional parts
for Volume mod.
Resistors
2 - 220k
1 - 4k7 (4.7k)

Parts List for regular wah
Resistors
Capacitors Transistors
1 - 470 ohm
2 - 0,01uF
Q1 - MPSA18
2 - 1k
2 - 0.22uF
Q2 - MPSA18
1 - 1K5 (1.5k) 1 - 4.7uF
Transistors can be
1 - 10k
1 - 47uF
any low noise NPN
1 - 22k
Pots
1 - 33k
1 - Wah pot (2N5088, etc)
1 - 68k
Diodes
1 - 82k
1 - 1N914
2 - 470k

Other
DPDT switch

Aditional parts for Output buffer
Resistors
Transistors
1 - 4k7 (4.7k)
Q4 - 2N5457
1 - 1Meg
Other fets will work
Capacitors
1 - 1uF

Pots
1 - 100k Trimpot
OUTPUT BUFFER

NOTES:
* use a jumper if not implementing the
vol/wah switch
** Jumper if not adding "Q" control

1k
AC
ADAPTOR

Capacitors
1 - 0.22uF

D1

.05
Q4

47uF
1uF

9v

+

1M

4k7

100k

22k
1k

.22
6k8
.01

68k
Q1

INPUT

470k

470k

1
100k
3

2 .22
Q2

1

Q3

1M

1k5

470

550mH

33k

82k

4.7uF

10k

4k7

2
1k5
.22
100k**
1M

Layout and presentation by Francisco Pe?a 2001 - 2004(R).
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.

Aditional parts for input buffer
Resistors
Transistors
1 - 1K5 (1.5k)
Q3 - 2N5457
1 - 6k8 (6.8k)
Other fets will work
2 - 1Meg
Pots
1 - 5k Trimpot

" Q " Mod.
1 - 100k Trimpot

5k

INPUT BUFFER/BOOST

" Q "
CONTROL

220k*

220k

VOLUME SWITCH MOD

.01

OUTPUT


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