Akashic Guitar effects PCB lookup
DRIVEMIDTREBBASS

125B · 4 knobs

PCB Guitar Mania

Calvin Vai

Based on the Carvin Vai preamp

Category
Overdrive
Controls
Drive · Mid · Treb · Bass
Difficulty
Intermediate
Price
€9.90out 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

For the love of god! Get your double-neck guitar and your animal print yoga pants ready because the audience is waiting. Forget Calvin Klein; it’s time for Calvin Vai!

Try this Jfet Emulation of the masterpiece designed by The Carvin’s engineers and Steve Vai, featuring the best of Legacy 1 and 2!

Introduction

Yes! The legendary tones of Steve Vai’s Carvin Legacy amps are now available in a compact version. Since we wanted to keep the size of this pedal as small as possible, the preamp tubes have been replaced with JFET transistors to make sure there are no compromises made to the sound. This circuit is so outstanding that you can easily skip your amp’s preamp and connect this bad horsie right to the effects loop.

The Calvin Vai board comes with 6 knobs – VOLUME, DRIVE, PRESENCE, BASS, MID, and TREBLE. With the VOLUME control you can set the loudness of the effect from barely audible, through unity gain, right to a full stadium blast. DRIVE is how you operate the saturation of the distortion – from delicate crunch to endless leads; it’s all here. The EQ section contains 4 pots – BASS, MID, TREBLE and also PRESENCE. With the first three you control the amount of low, mid and high frequencies coming out of the speaker, while PRESENCE is a fantastic tool when you want to make sure your guitar is heard in a dense mix.

You have your tone in your fingers and now you also have the tone on your pedalboard, so there are no more excuses, but to practice those sweeps until you experience erotic nightmares… and trust us, you will!

Controls

• Bass

• Drive

• Mid

• Presence

• Treb

• Volume

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

Calvin Vai – Building Docs

Calvin Vai – 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
R1220k220k
R2910r910
R34m70.0047
R51k51.5k
R7470k470k
R81m1M
R968k68k
R103k33.3k
R12470k470k
R13220k220k
R14470k470k
R152k22.2k
R17100k100k
R18100k100k
R1947k47k
R204k74.7k
R212m20.0022
Capacitors 26
C10560p560p
C114n74.7n
C12560p560p
C13560p560p
C14560p560p
C152n22.2n
C17560p560p
C1810n10n
C19250pF250p
C2010n10n
C2110n10n
C22560p560p
C23560p560p
C242n22.2n
C2533n33n
C262n22.2n
C21u1u
C547u47u
C110pF10p
C7220u220u
C347n47n
C161u1u
C42n22.2n
C6560pF560p
C8560pF560p
C92n22.2n
Diodes 1
D11n58171N5817
Transistors 4
Q12N54572N5457
Q22N54572N5457
Q32N54572N5457
Q42N54572N5457
Potentiometers 4
DRIVE500KAA500kPotentiometer
MID25KAA25kPotentiometer
TREB1MBB1MPotentiometer
BASS1MBB1MPotentiometer