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DEPTHRATETONEBIAS

Enclosure not stated · 4 knobs

PCB Guitar Mania

Zephyr Stereo Chorus

Based on the Arion SCH-1 Stereo Chorus

Category
Vibrato / Chorus· Stereo Analog Chorus
Controls
Depth · Rate · Tone · Bias
Difficulty
Advanced
Price
€14.90out 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 Arion SCH-1 Stereo Chorus Effect, a powerful chorus pedal from the 80s considered one of the most important pedals of history. Designed to provide you with a high-quality experience, this classic and intuitive board is ready to deliver that gratifying chorus effect that made it so famous in its days.

Introduction

Zephyr Stereo Chorus is a classic so intuitive and organic that it allows you to jump right into using it without previous knowledge. You can change your waves’ rate, depth, and tone till you reach the exact effect you need. Capable of running it into mono or splitting in a really nice stereo, the pleasing Leslie-type sounds will wrap you and your audience like a gentle breeze from all directions.

If you search for the original pedal, you will notice that it’s difficult to find and is even more challenging to convince an owner to sell it. Therefore, we decided to add this circuit to our collection so any pedal creator can have his own.

The Tone knob is unusual for a typical chorus pedal, and it will give you a beautiful and unique chorus sound while interacting with the treble frequencies. You can start by setting all the knobs at noon for a nice sixties Leslie chorus type sound or try a widest more eighties-like effect by putting Rate at 9 o’clock, Depth at max, and Tone at 2 o’clock. We recommend trying as many knobs positions as possible because each of them is a breath of fresh air that will inspire your playing.

Controls

• Depth

• Rate

• Tone

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.

Zephyr Stereo Chorus 1v3 – Building Docs

Zephyr Stereo Chorus – Building Docs

Zephyr Stereo Chorus – Drilling template

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 109 rows

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Resistors 53
R40390k390k
R41470k470k
R425k65.6k
R11m1M
R431m1M
R21k1k
R44470k470k
R3470k470k
R4510k10k
R410k10k
R4610k10k
R547k47k
R478k28.2k
R610k10k
R4810k10k
R747k47k
R4947k47k
R81k1k
R5047k47k
R933k33k
R5110k10k
R1033k33k
R521k1k
R111m1M
R53100k100k
R1251k51k
R1347k47k
R1447k47k
R1510k10k
R161k1k
R17100k100k
R18100k100k
R1910k10k
R2010k10k
R2110k10k
R2210k10k
R23220r220
R24100k100k
R2556k56k
R261m1M
R2710k10k
R2810k10k
R2910k10k
R3010k10k
R3110k10k
R3210k10k
R3339k39k
R3410k10k
R351k51.5k
R36160k160k
R373k33.3k
R3833k33k
R3910k10k
Capacitors 36
C11u1u
C21u1u
C36n86.8n
C4100p100p
C52n22.2n
C615n15n
C710n10n
C810n10n
C9100p100p
C106n86.8n
C11470n470n
C1233n33n
C133n33.3n
C148n28.2n
C15470p470p
C161u1u
C1922n22n
C204n74.7n
C218n28.2n
C22470p470p
C2322n22n
C2647p47p
C2722n22n
C28100n100n
C31100n100n
C33100n100n
C34100p100p
C356n86.8n
C36470n470n
C1710u10u
C184u74.7u
C2410u10u
C25220u220u
C2922u22u
C30100u100u
C3210u10u
Diodes 4
D11n9141N914
D21n9141N914
D31n9141N914
D41n58171N5817
Transistors 6
Q5BC550BC550
Q6BC550BC550
Q1BC550BC550
Q2BC550BC550
Q3BC550BC550
Q4BC550BC550
ICs 5
IC1TL072TL072
IC2TL072TL072
IC3MN3207MN3207
IC4TL072TL072
IC5MN3102MN3102
Potentiometers 4
DEPTH100KBB100kPotentiometer
RATE100KBB100kPotentiometer
TONE100KBB100kPotentiometer
BIAS100K100kPotentiometer
Switches 1
SW2SPDTSPDT