Mad Bean Pedals Glitchee User manual

Glitchee
FX TYPE: SubOctave-Filter
Enclosure Size: 125B
“Softie” compatibility: none
© 2020 madbeanpedals
Overview
tl,dr: The Glitchee is what you get when you combine an EQD® Bit Commander® with a Seamoon Funk Machine. It does
distortion, octave down, and sub-octave tones with the ability to dial in a dynamic lter over the whole thing.
Story: I liked the simplicity of the Bit Commander and wanted to do something with it, but not a straight up clone. It
occurred to me that adding a dynamically driven lter could produce some synth-style tones and that was the genesis of
the idea. What came after was a bit a slog. The Glitchee ended up being the most breadboarded project I’ve ever done. I
think it was four or ve teardowns and re-dos.
Anyway, it took a while to nd the right lter and envelope control. I ended up with a modded Seamoon Funk Machine
then used a little trick to make the LM386 double as the distortion generator and envelope detector. Like most solutions,
they become obvious after you nd them. Sometimes it takes a while to nd the right path to “optimal topology” (that’s
fancy speak for ‘making shit work good’). As the name implies the effect is rather glitchey. Octave generation is not too
smooth in its decay but that is part of the charm of all analog octave down. Mostly, it’s just a lot of fun to play!
Controls
• DRIVE: Sets the volume of the distorted tones.
• LOW, SUB: Volume of one and two octaves down, resp.
• BLEND: After the DRIVE, LOW and SUB summing stage the audio splits into two paths, clean and
dynamic lter. The Blend control sets the mix between those.
• VOL: Total output volume.
• SENSE: Sets the envelope response (IOW, the sensitivity to pick attack).
• FREQ: Sets the lter response (really, it’s a gain control for the lter). The SENSE and FREQ are used
together to set the overall shape and response of the lter.
• DECAY: This was intended to set different decay responses in the envelope lter but I later changed my
mind. It might be more accurate to call this switch “TRIM” as it cuts off a bit of low end from the lter in the
Up position. Down position is normal response. Please see the Notes section for further explanation.
• OCT: This secondary footswitch allows you to toggle the octaves down on and off.
Terms of Use: You are free to use purchased Glitchee circuit boards for both DIY and small commercial operations. You may not
offer Glitchee 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 Glitchee
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Values Glitchee
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Traces Glitchee
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B.O.M. Glitchee
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Resistors Caps Diodes
R1 1M C1 100n D1 1n914
R2 2k2 C2 10uF D2 1n914
R3 470R C3 4u7 D3 1N4001
R4 22k C5 1uF C4 1n914
R5 100k C6 10n Transistors
R6 220k C7 22n Q1 2n3904
R7 220k C8 22n IC
R8 220k C9 22n IC1 LM386
R9 220k C10 1uF IC2 CD4024
R10 220k C11 1uF IC3 TL074
R11 22k C12 1uF OPTO1
R12 100R C13 22pF OPTO1 NSL32R1
R13 220k C14 4n7 Switch
R14 470k C15 4n7 DECAY On/On
R15 10k C16 1n Pots
R16 10k C17 1uF BLEND 10kA
R17 10k C18 1uF SENSE 10kB
R18 22k C19 150pF VOL 50kA
R19 10k C20 4u7 FREQ 1MB
R20 22k C21 100uF DRIVE 100kA
R21 100k C22 100n LOW 100kA
R22 1k C23 10uF SUB 100kA
R23 100R
R24 4k7
R25 4k7
R26 10k
R27 10k

Shopping List Glitchee
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Value QTY Type Rating
100R 2 Carbon / Metal Film 1/4W
470R 1 Carbon / Metal Film 1/4W
1k 1 Carbon / Metal Film 1/4W
2k2 1 Carbon / Metal Film 1/4W
4k7 2 Carbon / Metal Film 1/4W
10k 6 Carbon / Metal Film 1/4W
22k 4 Carbon / Metal Film 1/4W
100k 2 Carbon / Metal Film 1/4W
220k 6 Carbon / Metal Film 1/4W
470k 1 Carbon / Metal Film 1/4W
1M 1 Carbon / Metal Film 1/4W
22pF 1 Ceramic / MLCC 16v min.
150pF 1 Ceramic / MLCC 16v min.
1n 1 Film 16v min.
4n7 2 Film 16v min.
10n 1 Film 16v min.
22n 3 Film 16v min.
100n 2 Film 16v min.
1uF 2 Film 16v min.
1uF 4 Electrolytic 16v min.
4u7 2 Electrolytic 16v min.
10uF 2 Electrolytic 16v min.
100uF 1 Electrolytic 16v min.
1n914 3
1N4001 1
2n3904 1
LM386 1
CD4024 1
TL074 1
NSL32R1 1
SPDT 1 On/On Solder or Pin Mount
10kA 1 PCB Right Angle - Plastic Shaft 9mm
10kB 1 PCB Right Angle - Plastic Shaft 9mm
50kA 1 PCB Right Angle - Plastic Shaft 9mm
1MB1 PCB Right Angle - Plastic Shaft 9mm
100kA 3 PCB Right Angle 16mm

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Parts Guide Glitchee
TL074:
http://smallbear-electronics.mybigcommerce.com/ic-tl074/
CD4024:
http://smallbear-electronics.mybigcommerce.com/ic-cd4024be/
LM386:
http://smallbear-electronics.mybigcommerce.com/ic-lm386-n3/
NSL32R1:
http://smallbear-electronics.mybigcommerce.com/photocoupler-silonex-nsl-32/
On/On:
http://smallbear-electronics.mybigcommerce.com/spdt-on-on-short-lever/
16mm PC Mount pots:
http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-16mm-right-angle-pc-mount/
9mm PCB Right Angle - Plastic Shaft:
http://smallbear-electronics.mybigcommerce.com/alpha-single-gang-9mm-right-angle-pc-mount-w-
knurled-plastic-shaft/
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 Glitchee
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• As shown on the Values layout pic on page 3, C4 is replaced with a 1n914. The anode goes to the
square pad, and cathode to the round one. Or, use this pic as a reference.
The reason for this change: throughout the development I had been testing different size electrolytic
caps on the envelope follower to try and get some variation on the note decay. While it does have
an effect on the LED that drives the optocoupler, in the end I just felt like it wasn’t enough to warrant
the toggle switch (and it was too late since the boards were done). So, in trying alternatives I found
putting a small signal diode in parallel with C3 actually did make a cool variation. It seems to lop
off a little more low end of the lter section when the Sense knob is in the rst half of its rotation.
It becomes more apparent when the low octaves are on. So, a mistake turns into a win. The
madbeanpedals motto.
•I don’t have much in the way of mod recommendations. You can alter the lter by changing C14
and C15 (use equal values). So, for a bass maybe socket those and try 10n. Or you could go
smaller if you like really sharp pointy lters.
• A 10kC for the Sense knob is actually preferred but they seem to be hard to get right now. 10kB is
ne enough.
•Be sure you install your NSL32 in the correct way! Cream dots, and so forth.

Wiring Diagram Glitchee
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125B Drill Guide Glitchee
Note: Drill Guides are approximate and may require tweaking depending on the types of jacks, switches and pots you use.
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Voltages Glitchee
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• 9.42vDC One Spot
• Current Draw: ~ 17mA
IC1 LM386 IC2 CD4024 IC3 TL074
1 1.26 1 ignore 1 3.94
2 0 2 0 2 4.02
3 7mV 3 7.96 3 3.97
4 0 4 7.96 4 7.96
5 3.93 5 7.96 5 3.98
6 7.96 6 0 6 3.98
7 3.99 7 0 7 3.98
8 1.23 8 ignore 8 3.98
9 0 9 3.98
Q1 2n3904 10 0 10 0
C 6.35 11 7.89 11 3.98
B 0.55 12 7.89 12 3.98
E 39mV 13 ignore 13 3.98
14 7.96 14 3.98
The 100R current limiting resistor on the power supply drops
the supply voltage quite a bit. However, this effect does not
seem to need a lot of headroom. You can always jumper it or
use 47R in its place. I went with 100R for heavier noise ltering
on the supply line, JIC.

Build Pic Glitchee
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See how expertly I removed C4 and replaced it with that diode? Perfect
desoldering technique. Yep.
LOOK AWAY!

Schematic Glitchee
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The FREQ. pot is B type (linear)