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BASSGAINMASTERMIDSPRE-VOLTREBLEVOL

125B · 7 knobs

PCB Guitar Mania

Lemon Bass

Based on the BAJA Orange AD200B MkII bass

Category
Overdrive· Bass Pre-amp
Controls
Bass · Gain · Master · Mids · Pre-Vol · Treble · Vol
Difficulty
Advanced
Price
€11.90out of stock

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

Bass pre-amp based on Orange AD200B Mkll, replacing the original unit tubes for more convenient dual opamps that make it more friendly to your pedal board while keeping a great tone with deep, dynamic low-end and a creamy yet focused mid-range.

Introduction

The Lemon Bass is an original circuit developed by Bajaman for FreeStompboxes, inspired by the now-iconic Orange AD200B MkII bass amplifier, emulating its gain structure by replacing the tubes from the original head for more convenient OpAmps, making it pedal-friendly while keeping its wide spectrum of vintage and modern tones.

This modern classic can cover every tonal spectrum you need, from Vintage Soul to Classic Rock, high-fidelity Funk to grinding Metal.

In this model, you can place Q1* as an SMD transistor or the classic through-hole version. Choose just one of both. Remember, the SMD J201 are more consistent quality-wise than its through-hole counterpart, which is plagued by fake Chinese counterfeits.

Controls

• Volume

• Gain

• Pre-amp

• Bass

• Mids

• Treble

For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum.

For any technical questions regarding this build don’t forget to check out our Facebook Group and our forum at Free Stomp Boxes.

Lemon Bass – Building Docs

Lemon Bass – Drilling Template

Schematic

The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 63 rows

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RefValueNormalizedTypeNotes
Resistors 29
R11M51.5M
R21M1M
R3100K100k
R41M1M
R53K33.3k
R64K74.7k
R7820R820
R8100K100k
R922K22k
R1047K47k
R114K74.7k
R12820R820
R13100K100k
R148K28.2k
R151M1M
R1647K47k
R172K22.2k
R184K74.7k
R1915K15k
R202K22.2k
R212K22.2k
R2215K15k
R231M1M
R241M1M
R254K74.7k
R264K74.7k
R271K1k
R2810K10k
R2910K10k
Capacitors 18
C4560p560p
C6220n220n
C756p56p
C81n21.2n
C102n22.2n
C11470n470n
C12220n220n
C1347p47p
C1422n22n
C151u1u
C171u1u
C181u1u
C5100U100u
C9220u220u
C16220u220u
C11u1u
C21u1u
C333p33p
Diodes 5
D01N58171N5817
D11n41481N4148
D21n41481N4148
D31n41481N4148
D41n41481N4148
ICs 3
IC1TL072TL072
IC2TL072TL072
IC3TL062TL062
Potentiometers 7
BASS50KBB50kPotentiometer
GAIN50KBB50kPotentiometer
MASTER100KBB100kPotentiometer
MIDS1KBB1kPotentiometer
PRE-VOL1MBB1MPotentiometer
TREBLE25KBB25kPotentiometer
VOL1M1MPotentiometer
Jacks & sockets 1
J201Q1*Q1*