Madbeanpedals presents
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(Based on the Klon Centaur)
PCB artwork m2010 madbeanpedals
Ver.3 10.15.10
R1 10k C1 100n D1, D2 GE
R2 1M C2 100n D3 1n4742
R3 100k C3 4u7 D4, D5 1N4001
R4 560R C4 68n
R5 5k1 C5 390n
R6 1k5 C6 68n IC1, IC2 TL072
R7 1k C7 82n IC3 ICL7660SCPA
R8 10k C8 390pF
R9 2k C9 1uF
R10 15k C10 1uF GAIN1 100kB
R11 422k C11 1uF GAIN2 100kB
R12 1k C12 2n2 TONE 10kB
R13 1k5 C13 27n VOL 10kB
R14 15k C14 820pF
R15 47k C15 3n9
R16 22k C16 4u7
R17 27k C17 47uF
R18 12k C18 1uF
R19 392k C19 1uF
R20 1k8 C20 1uF
R21 100k C21 1uF
R22 100k C22 47uF
R23 4k7
R24 560R
R25 27k
R26 27k
R27 3k9
R28 68k
R29 68k
R30 100k
RTB 1M
Dual-Ganged
100kB Pot
Pots
Resistors Caps Diodes
IC
Notes
The newest version of the Sunking offers a slightly reduced PCB footprint for easier fitting in a 1590B
enclosure. Corrections were also made to the output section. Ver.2 had three resistors placed on the
PCB that should have been wired directly to the bypass switch in a slightly different configuration.
This has been fixed for ver.3 (instructions on how to make the correction on ver.2 are contained in the
archived documents for the Sunking at www.madbeanpedals.com/projects/index.html).
The schematic has also been re-drawn in an attempt to simplify it for analysis. The component values
between all versions are identical, but the numbering is not. Ver.3 components are labeled in a
slightly different order, so you do not want to use the bill of materials in this document to build any of
the previous versions.
Lastly, an extra spot for a pull-down resistor was included should you want to build the Sunking as
true-bypass.
A MAX1044 or TC1044 may be substituted for IC3.
The exact germanium diodes used for D1 and D2 is unknown. The designer claims that the use of
these diodes is critical to fully realizing the tone of the Klon. In practice, there are a number of diodes
that can be used that produce excellent results. These are 1n34a, 1n270, 1n60, BAT41 and 1n914.
Its a good idea to socket these two and experiment to find your favorites. My personal favorite is
BAT41.
If using a 3PDT, wire the two outside columns of lugs, leaving the middle column completely
unconnected.
To make the Sunking true-bypass
Remove C3, R3, R4, R28, R29, R30
Add RTB (1M resistor)
Wiring True-Bypass
The IN pad is wired to the FX input
9v is wired to your DC jack
S2 is wired to ground
S3 is wired for toggling the LED indicator
S6 is wired to FX output
S1 and S4 are left unconnected
Parts
Xicon General or Hi-Temp radial electrolytic caps, 25v
Panasonic ECQ-B or ECQ-V film caps
Xicon carbon or metal film resistors, W
Ceramic, Silver Mica or film for the 390pF and 820pF (stock unit uses film).
Single Sided Version For Etching
R1 10k R16 47k C1 100n C16 1uF
R2 1M R17 27k C2 4u7 C17 47uF
R3 100k R18 12k C3 100n C18 47uF
R4 560R R19 15k C4 68n C19 1uF
R5 5k1 R20 392k C5 68n C20 1uF
R6 10k R21 1k8 C6 390n C21 1uF
R7 1k5 R22 100k C7 82n C22 1uF
R8 1k5 R23 4k7 C8 390pF
R9 1k R24 100k C9 1uF D1/D2 1n4001
R10 2k R25 560R C10 1uF D4/D5 1n270
R11 15k R26 68k C11 2n2 Z1 1n4742
R12 422k R27 68k C12 27n
R13 1k R28 100k C13 820pF IC1/IC2 TL072
R14 3k9 R29 27k C14 3n9 IC3 ICL7660SCPA
R15 22k R30 27k C15 4u7
GAIN1/2 100kB Dual
TONE 10kB
VOL 10kB
2.13 x 2.27 (w / borders)
\
The PCB here is labeled ver.2 but it is exactly the same as ver.3 (i.e. the output
section is correct).
If you want to simplify the wiring, connect R28 on the 3PDT/DPDT switch
(between the middle lugs -purple and brown on the wiring diagram). If you do
this, you do not need a wire from the OUT pad on the board to the tip of the
output jack.
Note the jumper between R8 and R9.
Visit http://www.madbeanpedals.com/learn/index.html for helpful wiring diagrams and drilling templates!
This product is intended for DIY use. Commercial use is prohibited.
Voltages (off DC supply @ 8.89v)
Pins IC1 IC2 IC3
1 4.45 4.52 8.88
2 4.47 4.47 4.55
3 3.43 4.46 0
4 0 -8.46 -4.15
5 4.45 4.45 -8.47
6 4.46 4.46 3.99
7 4.45 4.41 5.33
8 8.88 16.03 8.88
