Akashic Guitar effects PCB lookup
BASSGAINLEVELMIDSOD-GAINOD-LEVELPRECENSETREBLE

Enclosure not stated · 8 knobs

PCB Guitar Mania

Humble Overdrive

Based on the Dumble Overdrive Special 124

Category
Overdrive· Classic Overdrive
Controls
Bass · Gain · Level · Mids · Od-Gain · Od-Level · Precense · Treble
Difficulty
Advanced
Price
€14.90out of stock
Tags
diy-originals

Heads up Builders widely report inconsistent quality from PCB Guitar Mania boards, and whether a given board works is a gamble. Read recent forum reports before ordering.

From the vendor

Project overview

Someone once asked Gandhi – what is the secret to a great tone? He replied with a single word ‘humble’. After years of trying to decode his cryptic message, we came up with the Humble Overdrive, and boy, oh boy, it’s a secret we want to share with you!

Introduction

The Humble Overdrive is a circuit designed by Bajaman at the Free Stompboxes forum. To add to the mystery of this special unit, it is a DIY only preamp that you won’t find on any of the mass production lines. It comes equipped with 3 switches – BRIGHT, MID BOOST and JAZZ/ROCK. The BRIGHT switch turns up the high frequencies a little bit, adding some sparkle to your sound. MID BOOST works the same way as the BRIGHT switch, but it affects the midrange, so it’s a very useful tool in dense mixes, when you want to cut through. With JAZZ/ROCK selector you can choose what gets emphasised – the lower frequencies that work well in jazz style, or the upper part of the frequency spectrum that is useful in more popular genres.

If there is something contrary to Humble Overdrive’s name, it’s the knob selection. Humble Overdrive comes with 8 potentiometers allowing for the ultimate tone shaping experience. On-board we have: LEVEL, OD-LEVEL, OD-GAIN, GAIN, PRESENCE, TREBLE, MIDS and BASS. Since the pedal has 2 channels, there are 2 volume controls for each channel – LEVEL and OD-LEVEL. The same goes with the saturation control – GAIN and OD-GAIN for their respective channels. As for the EQ section, we have a separate knob for each frequency section and the TREBLE, MIDS, and BASS naming is pretty self-explanatory. What is worth mentioning here is that this part of the EQ section comes uniquely before the overdrive section, so the changes done to it will also affect the character of the drive. Last, but not least is the PRESENCE pot. This is a filter placed right after the overdrive section and it affects the mids and high frequencies. Many people like to think of PRESENCE as a blanket-over-the-cab control – you can decide if you like your tone a little warmer (hence the blanket) or with more in your face character.

Have you ever caught yourself listening to legends like John Mayer or Robben Ford and wishing you could achieve their fantastic tones? We all did at one point, so stop hesitating and give this pedal a chance because you won’t be disappointed. It doesn’t matter if you play a strat or a les paul – it goes extremely well with everything, just like the classic amp it’s based on. Reme

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 99 rows

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RefValueNormalizedTypeNotes
Resistors 42
R382K22.2k
R391M1M
R11M51.5M
R401K1k
R21M1M
R4110K10k
R3100K100k
R4210K10k
R41M1M
R53K33.3k
R62K22.2k
R712K12k
R8470r470
R9100K100k
R1015K15k
R11470K470k
R121K1k
R1312K12k
R1422K22k
R15470R470
R16100K100k
R172K22.2k
R18100K100k
R196K86.8k
R2012K12k
R211K1k
R221K1k
R2310K10k
R2418K18k
R2512K12k
R261K1k
R271K1k
R282K22.2k
R2915K15k
R30100K100k
R31100K100k
R321K21.2k
R331K1k
R34150R150
R352K72.7k
R361K1k
R3722K22k
Capacitors 34
C11u1u
C21u1u
C3330p330p
C43n93.9n
C6100n100n
C722n22n
C81u1u
C910n10n
C103n33.3n
C1147n47n
C123n33.3n
C134n74.7n
C151n81.8n
C16220p220p
C17150p150p
C182n22.2n
C20100n100n
C21150p150p
C222n22.2n
C2447n47n
C25220n220n
C261n1n
C271u1u
C281u1u
C29220p220p
C301u1u
C311u1u
C32100n100n
C341u1u
C522u22u
C1447u47u
C192u22.2u
C232u22.2u
C3347u47u
Diodes 8
D01n58171N5817
D13mm3MM
D23mm3MM
D31N41481N4148
D41N41481N4148
D51N41481N4148
D61N41481N4148
D71N41481N4148
Transistors 1
Q1J201J201
ICs 4
IC1TL072TL072
IC2TL072TL072
IC3TL072TL072
IC4TL062TL062
Potentiometers 8
BASS50KBB50kPotentiometer
GAIN100KBB100kPotentiometer
LEVEL100KBB100kPotentiometer
MIDS25KBB25kPotentiometer
OD-GAIN25KBB25kPotentiometer
OD-LEVEL10KBB10kPotentiometer
PRECENSE1KBB1kPotentiometer
TREBLE25KBB25kPotentiometer
Trimmers 1
TRIM500K500kTrimmer
Jacks & sockets 1
J201Q1Q1