Mad Bean Pedals Rabbit Hole Manual de usuario
Rabbit Hole
FX TYPE: Distortion
Based on the EHX® Big Muff™
© 2016 madbeanpedals
1.3” W x 2.2” H
Terms of Use: You are free to use purchased Rabbit Hole circuit boards for both DIY and small commercial operations.
You may not offer Rabbit Hole PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is, of
course, okay.
2
R1 1M C1 100n D1 - D4 1n914
R2 3K3 C2 omit D5 1N4001
R3 82K C3 100n
R4 390K C4 100n Q1 - Q4 2n5088
R5 820R C5 560p
R6 22K C6 50n SUS 100kB
R7 1K C7 100n TONE 100kB
R8 8K2 C8 560p VOL 100kA
R9 omit C9 50n
R10 390K C10 4n
R11 150R C11 10n
R12 12K C12 100n
R13 8K2 C13 100n
R14 82K C14 47uF
R15 390K C15 100n
R16 820R
R17 22K
R18 39K
R19 39K
R20 390K
R21 100K
R22 12K
R23 2K7
R24 100R
Pots
Transistors
Triangle
Resistors Caps Diodes
R1 1M C1 100n D1 - D4 1n914
R2 39K C2 470p D5 1N4001
R3 100K C3 100n
R4 470K C4 100n Q1 - Q4 2n5088
R5 100R C5 470p
R6 15K C6 100n SUS 100kB
R7 1K C7 100n TONE 100kB
R8 8K2 C8 470p VOL 100kA
R9 100K C9 100n
R10 470K C10 4n
R11 100R C11 10n
R12 10K C12 100n
R13 8K2 C13 100n
R14 100K C14 47uF
R15 470K C15 100n
R16 100R
R17 15K
R18 39K
R19 39K
R20 390K
R21 100K
R22 10K
R23 2K7
R24 100R
Transistors
Pots
Violet Ram's Head
Resistors Caps Diodes
3
R1 1M C1 100n D1 - D4 1n914
R2 39K C2 470p D5 1N4001
R3 100K C3 100n
R4 470K C4 100n Q1 - Q4 2n5088
R5 390R C5 470p
R6 12K C6 47n SUS 100kB
R7 1K C7 100n TONE 100kB
R8 10K C8 470p VOL 100kA
R9 100K C9 47n
R10 470K C10 3n9
R11 390R C11 10n
R12 12K C12 100n
R13 10K C13 100n
R14 100K C14 47uF
R15 470K C15 100n
R16 390R
R17 12K
R18 22K
R19 20K
R20 470K
R21 100K
R22 10K
R23 2K
R24 100R
Transistors
Pots
Green Russian
Resistors Caps Diodes
R1 1M C1 100n D1 - D4 1n914
R2 39K C2 430p D5 1N4001
R3 100K C3 100n
R4 470K C4 100n Q1 - Q4 2n5088
R5 390R C5 430p
R6 12K C6 47n SUS 100kB
R7 1K C7 100n TONE 100kB
R8 10K C8 430p VOL 100kA
R9 100K C9 47n
R10 470K C10 3n9
R11 390R C11 10n
R12 12K C12 100n
R13 10K C13 100n
R14 100K C14 47uF
R15 470K C15 100n
R16 390R
R17 12K
R18 22K
R19 20K
R20 470K
R21 100K
R22 10K
R23 2K7
R24 100R
Caps Diodes
Transistors
Pots
Civil War
Resistors
4
R1 1M C1 100n D1 - D4 1n914
R2 33k C2 500pF D5 1N4001
R3 100k C3 100n
R4 470k C4 100n Q1 - Q4 BC550
R5 100R C5 500pF
R6 18k C6 100n SUS 100kB
R7 820R C7 100n TONE 100kB
R8 8k2 C8 500pF VOL 100kA
R9 100k C9 100n
R10 470k C10 4n
R11 100R C11 10n
R12 10k C12 100n
R13 8k2 C13 100n
R14 100k C14 47uF
R15 470k C15 100n
R16 100R
R17 18k
R18 33k
R19 33k
R20 390k
R21 100k
R22 10k
R23 2k7
R24 100R
Transistors
Pots
Mayo
Resistors Caps Diodes
R1 1M C1 100n D1 - D4 1n914
R2 33k C2 560pF D5 1N4001
R3 82k C3 100n
R4 470k C4 100n Q1 - Q4 2n5088
R5 jumper C5 560pF
R6 22k C6 50n SUS 100kB
R7 1k C7 100n TONE 100kB
R8 15k C8 560pF VOL 100kA
R9 82k C9 50n
R10 470k C10 4n
R11 jumper C11 10n
R12 22k C12 100n
R13 15k C13 100n
R14 82k C14 47uF
R15 470k C15 100n
R16 jumper
R17 22k
R18 39k
R19 39k
R20 470k
R21 100k
R22 22k
R23 2k2
R24 100R
Transistors
Pots
Creamy Dreamer
Resistors Caps Diodes
5
1590A Drill Guide
3.64”W x 5.63”H
6
Overview
The Rabbit Hole is an open-ended project in which you can create numerous versions of the hugely popular Electro-
Harmonix® Big Muff™. The Big Muff™ is a staple of modern rock and has been used and popularized by innumerable
players in the last three decades. A components list has been included covering some of the many variations of this
effect. The Rabbit Hole is the same project as the Mudbunny but is designed to fit in the 1590A enclosure.
Notes
There are many transistors you can use in the Rabbit Hole. Alternatives to the 2n5088 include BC549C, BC550,
BC182L, 2n5089, and MPSA18, as well as many more. Using different transistors will create unique variations in
tone. Be careful to use the correct pin-outs, however. Some transistors, such as the BC549C will need to be
rotated 180° from the silk screen drawing on the PCB due to its reversed pin-out. Always check the appropriate
datasheet for your transistor BEFORE soldering.
You can also create unique tones by using different diodes in place of the 1n914 (or the equivalent 1n4148).
Different diodes such as germanium, LED, and mosfets (wired as diodes) offer the opportunity to customize the
Rabbit Hole to your personal taste. Typical alternatives include 1n34a, 1n270, BAT41, red or green diffused 3mm
or 5mm LEDs, and 2n7000 mosfets.
Using germanium diodes in the D3/D4 position will sometimes create a very light octave effect. If you use them for
both D1/D2 and D3/D4 you may get a slight “bloom” in the note decay (a VERY COOL effect). If using a mosfet
for clipping, simply solder the gate and drain pins together on each mosfet and use the two leads (source and
gate/drain) as the diode in a back to back configuration on the D1/D2 and/or D3/D4 positions. Keep in mind space
is very limited on this PCB so it may be difficult to fit some diode types.
Resistors
Use 1/8W, if possible. 1/4W will also work but you will need to stand them up and bend the leads over (see my build pic at
the end of this doc).
Caps
Film: 16v box-type film or similar. MLCC (multi-layer ceramic capacitors) will also work well.
Use low-profile 47uF electrolytic for C14:
http://www.mouser.com/ProductDetail/Lelon/SS470M1EBK-
0605P/?qs=%2fha2pyFaduiyAAvSlfMpbODw%252bnxU4%2fmF%2f7sbuj8QXWHZy94xWJbRVg%3d%3d
Pots
Alpha 9mm PCB Mount: http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-pc-mount/
Jacks
I use these for 1590A builds
http://www.mouser.com/Search/ProductDetail.aspx?R=NRJ4HFvirtualkey56810000virtualkey550-10284
Which require these nuts: http://www.mouser.com/ProductDetail/Neutrik/NRJ-NUT-
B/?qs=S12Y1JoqO2B/J8w/0QDEXxm4CRfxKYczbewAXgkjeBc=
Both of these types should also work but may require adjusting the provided drilling template somewhat
http://smallbear-electronics.mybigcommerce.com/lumberg-1-4-compact-shrouded-mono-jack/
http://smallbear-electronics.mybigcommerce.com/1-4-in-mono-enclosed-111/
DC
Any of these will be fine
http://smallbear-electronics.mybigcommerce.com/dc-power-jack-all-plastic-unswitched/
http://smallbear-electronics.mybigcommerce.com/2-1-mm-plastic-round-external-nut/
http://smallbear-electronics.mybigcommerce.com/2-1-mm-all-plastic-round/
Knobs
Use ½” diamter knobs!
7
Build Guide
The Rabbit Hole is comprised of two PCBs – the main board and the pots board. Before you start
populating, gently break the two boards apart at their bridge point.
Use your wire cutter to clean up edges/leftover PCB material so they are flush. These two PCBs will
be wired together later on.
Populate the main board and solder all your parts in. You should avoid the use of sockets as they will
make components too tall to fit in the 1590A enclosure; solder all components directly to the PCB.
The pots are directly soldered to the second board. The SUS and VOL pots are soldered to the top
and the Tone pot is soldered to the bottom to form the typical triangle knob arrangement. Finally,
solder wires to connect the two boards together (wires 1-9). These wires should be about 1 – 1.5”
long each to allow the pot board to bend at a 90° angle to the main board. When assembling the final
pedal, the main board will rest on top of the input and output jacks while the pots board will bend over
and attached with nuts to the enclosure.
8
Wiring Guide
9
10
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