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BASSGAINTREBLEVOLUME

125B · 4 knobs

PCB Guitar Mania

Forestal Device

Based on the Earthquaker devices Westwood

Category
Overdrive· Translucent overdrive
Controls
Bass · Gain · Treble · Volume
Difficulty
Average
Price
€9.90out 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

Inspired by the Earthquaker devices Westwood, this translucent overdrive pedal tool excels at pulling the most harmonically rich drive from any amplifier.

Introduction

The founder of EarthQuaker Devices, Jamie Stillman, in his own words, states that the pedal was “kind of an experiment I did for myself.” Somehow related to Paul Cochrane’s Timmy features an active bass and treble control and up to 20db level boost. For this pedal, we included the possibility of adding a diode selector toggle to choose in between two different sets of diodes.

Inspired by the sonic clarity and definition imparted by a BBE Sonic Stomp Sonic Maximizer in a Music Man HD -130 amp, Jamie set out to build an overdrive that would similarly restore the signal definition and harmonic content lost to amplitude and phase distortion in guitar amps.

Achieving clarity and crunch at the same time can seem counter-intuitive; there is often some drawback in terms of note separation and definition. However, it’s immediately apparent that Westwood achieves its goal of signal transparency extremely well. When you hit a full, open E, each string’s unique timbre comes through easily, followed by an interesting dynamic sustain as the sparkling high end fades into a nasty low-end growl.

The overdrive’s essential flavor is incredibly natural and amp-like when using flat bass and treble settings, with pleasant tube-like quality. Boosting the treble level adds presence and midrange, which is useful for compensating for muddy humbuckers, such as lowering the level tones down slightly enough to tame a particularly peaky amp.

Raising the bass level to more extreme ranges evolved the sound from slightly assertive to a noticeable drone reminiscent of the low-end jolt heard in Metallica’s infamous. And Justice For All guitar mix, while extreme treble settings created an interesting lo-fi AM radio sound.

For this pedal, we included a diode selector toggle that switches in between the stock 4148 and our hybrid combination of silicon diodes + red LEDs for a more open sound. You can bypass this toggle and build the stock version by placing a jumper in between the 2 circular pads of the toggle and leaving D7-D10 unpopulated.

Controls

• Gain

• Level

• Bass

• Treble

• Diode Switch

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

Forestal Device – Building Docs

Forestal Device – 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 52 rows

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RefValueNormalizedTypeNotes
Resistors 17
R11M1M
R21K1k
R3470K470k
R44K74.7k
R54K74.7k
R61K1k
R733K33k
R86K26.2k
R9150K150k
R106K26.2k
R121K1k
R136K26.2k
R146K26.2k
R15150K150k
R1647K47k
R1747K47k
R1833K33k
Capacitors 15
C4100n100n
C5100p100p
C6220n220n
C8100n100n
C9100p100p
C10100n100n
C114n74.7n
C124n74.7n
C15100n100n
C161u1u
C1100u100u
C210u10u
C7100u100u
C131u1u
C141u1u
Diodes 7
D10unpopulated.UNPOPULATED.
D21N41481N4148
D31N41481N4148
D41n58171N5817
D51N41481N4148
D61N41481N4148
D91N41481N4148
Transistors 2
Q12N50892N5089
Q22N50892N5089
ICs 1
IC1OPA2134PAOPA2134PA
Potentiometers 4
BASSB100KB100kPotentiometer
GAINA1MA1MPotentiometer
TREBLEB100KB100kPotentiometer
VOLUMEA100KA100kPotentiometer
Switches 1
SW1on-off-onON-OFF-ON
LEDs 5
R11RLEDRLED
C3IN LEDIN LED
D13mm LED3MM LED
D7LED.REDLED.RED
D8LED.REDLED.RED