Mad Bean Pedals Edgelord User manual

Edgelord
FX TYPE: Envelope Filter
Based on the Ibanez® SB-7™
Enclosure Size: 1590BB
“Softie” compatibility: none
© 2020 madbeanpedals
Overview
The Edgelord is a clone of the Ibanez SB-7 Bass Synthesizer. This circuit has largely been
overlooked by the DIY community and it’s a shame because it is very fun to play with on bass and
guitar. It’s not really a synthesizer, though. More accurate to call it an envelope lter with optional
distortion. But, certainly it’s different enough than other lter projects out there to command your
attention.
Changes from the stock circuit: true bypass instead of FET bypass, toggle and rotary switches in
place of slide switches, output gain trimmer, and optional LEDs that light up according to which
“synth” mode you are in.
Controls
• FREQ - Sets the frequency sweep of the envelope.
• SENSE - Adjusts the sensitivity of the envelope detector.
• REZ - Adjusts the resonant peak of the envelope frequency.
• LEVEL - Sets the output volume of the effect.
• DECAY - This switch toggles between short and long envelope decay times.
• MODE - This rotary selects three modes for the effect: Autowah, Synth1 and Synth2. Autowah
is clean envelope. Synth1 and Synth2 add different amounts of distortion to the envelope for a
pseudo synthesizer effect.
• T1 - This trimmer sets the output voltage of the LM317TZ regulator. It should be adjusted for 7v
(see Notes).
• VOL - This trimmer sets the output gain (see Notes).
Terms of Use: You are free to use purchased Edgelord circuit boards for both DIY and small commercial operations. You may not
offer Edgelord PCBs for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is ne, though.
Technical assistance for your build(s) is available via the madbeanpedals forum. Please go there rather than emailing me for
assistance on builds. This is because (1) I’m not always available to respond via email in a timely and continuous manner, and (2)
posting technical problems and solutions in the forum creates a record from which other members may benet.

Parts Edgelord
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Values Edgelord
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Traces Edgelord
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B.O.M. Edgelord
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Resistors Resistors Caps Diodes
R1 1M R30 510k C1 22n D1 1n914
R2 1k R31 4k7 C2 1uF D2 1n914
R3 510k R32 100k C3 68pF D3 1n914
R4 10k R33 470R C4 100n D4 1n914
R5 510k R34 20k C5 1uF D5 1n914
R6 100k R35 1k C6 1uF D6 1N4001
R7 1k R36 2k2 C7 82n LED1-3 3mm
R8 56k R37 27k C8 820pF ICs
R9 6k8 R38 330k C9 820pF IC1 4558
R10 1k R39 150k C10 56n IC2 4558
R11 10k R40 22k C11 1uF IC3 4558
R12 510k R41 68k C12 470pF IC4 LM13700
R13 5k6 R42 5k6 C13 10uF Transistors
R14 47k R43 39k C14 1uF Q1 2N5088
R15 7k5 R44 18k C15 2u2 Q2 2N5088
R16 10k R45 47k C16 68pF Q3 2N5088
R17 10k R46 6k8 C17 220n Regulator
R18 10k R47 12k C18 470n REG LM317LZ
R19 1k R48 4k7 C19 10uF Switches
R20 1k R49 10k C20 100uF MODE 4P3T
R21 20k R50 10k C21 100n DECAY DPDT
R22 4k7 R51 9k1 C22 100uF Trimmers
R23 20k R52 22k C23 10uF T1 500R
R24 1k R53 1k C24 100uF VOL 10k
R25 1k R54 270R C25 100n Pots
R26 20k R55 10k C26 47uF FREQ 10kA
R27 4k7 R56 10k REZ 10kC
R28 10k R57 4k7 LEVEL 100kB
R29 13k SENSE 100kB

Shopping List Edgelord
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Value QTY Type Rating Value QTY Type Rating
270R 1 Metal / Carbon Film 1/4W 1uF 3 Electrolytic 16v min.
470R 1 Metal / Carbon Film 1/4W 2u2 1 Electrolytic 16v min.
1k 9 Metal / Carbon Film 1/4W 10uF 3 Electrolytic 16v min.
2k2 1 Metal / Carbon Film 1/4W 47uF 1 Electrolytic 16v min.
4k7 5 Metal / Carbon Film 1/4W 100uF 3 Electrolytic 16v min.
5k6 2 Metal / Carbon Film 1/4W 1n914 5
6k8 2 Metal / Carbon Film 1/4W 1N4001 1
7k5 1 Metal / Carbon Film 1/4W LED 3 *optional, any color 3mm
9k1 1 Metal / Carbon Film 1/4W 4558 3
10k 10 Metal / Carbon Film 1/4W LM13700 1
12k 1 Metal / Carbon Film 1/4W 2N5088 1
13k 1 Metal / Carbon Film 1/4W LM317LZ 1 TO-92
18k 1 Metal / Carbon Film 1/4W 4P3T 1 Pin Mount
20k 4 Metal / Carbon Film 1/4W DPDT 1 On/On, Solder Lug
22k 2 Metal / Carbon Film 1/4W 500R 1 Bourns 3362p
27k 1 Metal / Carbon Film 1/4W 10k 1 Bourns 3362p
39k 1 Metal / Carbon Film 1/4W 10kA 1 PCB Right Angle, Metal Shaft 9mm
47k 2 Metal / Carbon Film 1/4W 10kC 1 PCB Right Angle, Metal Shaft 9mm
56k 1 Metal / Carbon Film 1/4W 100kB 2 PCB Right Angle, Metal Shaft 9mm
68k 1 Metal / Carbon Film 1/4W
100k 2 Metal / Carbon Film 1/4W
150k 1 Metal / Carbon Film 1/4W
330k 1 Metal / Carbon Film 1/4W
510k 4 Metal / Carbon Film 1/4W
1M 1 Metal / Carbon Film 1/4W
68pF 2 Ceramic/MLCC 16v min.
470pF 1 Ceramic/MLCC 16v min.
820pF 2 Ceramic/MLCC 16v min.
22n 1 Film 16v min.
56n 1 Film 16v min.
82n 1 Film 16v min.
100n 3 Film 16v min.
220n 1 Film 16v min.
470n 1 Film 16v min.
1uF 2 Film 16v min.

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Parts Guide Edgelord
LM13700:
https://www.mouser.com/ProductDetail/926-LM13700N-NOPB/
LM13600 (sub):
http://smallbear-electronics.mybigcommerce.com/ic-njm13600d/
LM317LZ:
https://www.mouser.com/ProductDetail/511-LM317LZ/
LM317 (220 style sub):
http://smallbear-electronics.mybigcommerce.com/ic-lm317t/
4P3T:
http://smallbear-electronics.mybigcommerce.com/26mm-enclosed-4p2-3t/
DPDT (On/On):
http://smallbear-electronics.mybigcommerce.com/dpdt-on-on-solder-term/
Bourns 3362p (500R, 10k):
https://www.mouser.com/ProductDetail/652-3362P-1-501LF/
https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3362p/500-
ohm-trimmer-potentiometer-cermet-1-turn-3362p.html
https://www.mouser.com/ProductDetail/652-3362P-1-103LF/
https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3362p/10k-
ohm-trimmer-potentiometer-cermet-1-turn-3362p.html
9mm pots (10kA, 10kC, 100kB):
http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-right-angle-pc-mount/
Thinline DC Jack:
http://smallbear-electronics.mybigcommerce.com/dc-power-jack-all-plastic-unswitched-2-1-mm/
Enclosed Mono:
http://smallbear-electronics.mybigcommerce.com/1-4-in-mono-enclosed-jack/
http://smallbear-electronics.mybigcommerce.com/1-4-in-mono-enclosed-switchcraft-111x/
Lumberg Mono:
http://smallbear-electronics.mybigcommerce.com/lumberg-1-4-compact-shrouded-mono-jack/

Notes Edgelord
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• Be sure to break apart the two PCBs before you start to populate. You can trim the edges of each
with a wire cutter, if you like.
• The rotary switch should be soldered directly to the smaller PCB. Be sure you solder R57 rst
before you solder the rotary switch to the breakout board.
• The two PCBs are designed so you can use either straight pin headers or wires to connect them.
Straight pin headers will save time, however if you go this route you need to make sure both PCBs
are co-planar. IOW, make sure the rotary switch PCB is parallel with the main PCB so you do not
have to apply pressure or bend the pins when the entire thing is mounted in an enclosure.
• I used these pins and simply cut them to the number needed (10): https://www.taydaelectronics.
com/connectors-sockets/pin-headers/40-pin-2-00-mm-single-row-pin-header-strip.html
• You can just opt for wires to connect the boards if you don’t want to mess with the headers.
• Use your multimeter to adjust the T1 trimmer. Place the negative lead to ground and positive lead
to the “7V” pad next to C24. Adjust T1 until you read 7vDC.
• For the VOL trimmer, set the LEVEL pot to around 60-70% up and adjust the trimmer until you
have unity gain. This part was a mod I added to ensure all the bass dudes would be able to get
the output they desired depending on whether they use active or passive pickups.
• If you use the 3mm LEDs (LED1-3) they will light up depending on where the MODE switch is set.
You can omit them if you like - it won’t alter the effect in any way.
• The LM317LZ is the recommended regulator due to the smaller size and low current demand. But,
you can use the 220-style LM317 (this is what I used in my build). It will require you to bend the
tab on the regulator to 90 deg. FYI: both regulators have the same pinout.

Wiring Diagram Edgelord
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1590BB Drill Guide Edgelord
Note: Drill Guides are approximate and may require tweaking depending on the types of jacks, switches and pots you use.
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• You can use any jack style except for the Marshall type (they may be a bit too wide).
• The LEDs for the mode switch are optional.
• The drill location for the Mode rotary switch is for direct connection with pin headers. If you are
using wires instead of pin headers, move the drill location up a few millimeters to allow space for
the wires.

Voltages Edgelord
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• 9.42vDC One Spot
• Current Draw: ~19mA
IC1 4558 IC2 4558 IC3 4558 IC3 LM13700
1 4.7 1 2.75 1 4.7 1 1.12
2 4.7 2 3.45 2 4.7 2 ignore
3 4.68 3 3.45 3 4.43 3 4.7
4 0 4 0 4 0 4 4.7
5 4.7 5 3.5 5 4.47 5 5.9
6 4.7 6 3.51 6 4.7 6 0
7 4.74 7 3.51 7 4.7 7 5.9
8 9.39 8 7 8 9.39 8 4.72
9 4.66
Q1 Q2 REG LM317 10 5.82
C 9.39 C 7 I 9.39 11 9.4
B 6.08 B ~2 G 0 12 5.83
E 5.8 E ~1.4 O 7 13 4.69
14 4.7
15 ignore
16 1.15

Build Pic Edgelord
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If you use the LM317 (220 style regulator) gently bend the tab to a right angle to
allow for clearance on the bottom lid.

Schematic Edgelord
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