Akashic Guitar effects PCB lookup
LEVELSPEEDTIMEDEPTHFDBKGAIN

125B · 6 knobs

PCB Guitar Mania

Magnetic Delay

Based on the Keeley´s Magnetic Echo

Category
Delay· Modulated Delay
Controls
Level · Speed · Time · Depth · Fdbk · Gain
Difficulty
Advanced
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 Keeley’s Magnetic Echo. Featuring the delay circuit PT-2399 and LFO modulation, this pedal simulates tape echo sounds, delivering a warm and guitar and user-friendly type of delay.

Introduction

Magnetic Delay has a resourceful yet straightforward set of controls that are the key to this pedal’s uniqueness. Time, FDBK, and Level regulate the delay, and Depth and Speed give you access to some very vintage or rather distinct tones.

Now let us make a deeper analysis of what each knob has to offer:

With Time control, you will be able to set the repeat length between 40ms and 600ms. This range is perfect for a classic, vintage delay sounds; excellent for slap-back or medium-length delay times.

FDBK, this knob lets you set the number of those repeats. Adjust this for a single slapback echo or turn it up for a runaway, self-oscillating, or self-regenerating echoes. You can now go back and play with the Time control to achieve unprecedented results!

The Level control is your mix; establish how loud you want to hear those echoes.

Now let’s check the even crazier ones:

Depth gives you access to deeper and deeper chorusing and pitch shifting on your echoes. As you raise the control, the Depth and Rate LED will start to glow, giving you a visual indication of the amount of modulation you are applying to the repeats.

Speed is a slight pitch modulation on your echo! As simple as that, and a good knob to play and have fun with.

Has you can see, Magnetic Delay offers you an excellent way to create unique and very musical delays. If you are into experimental sounds, Rockabilly slap-back echoes, or just want a superior classic rock-sounding echo, this pedal is for you.

Controls

• Depth

• FDBK

• Level

• Speed

• Time

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

Magnetic Delay 1.1v – Building Docs

Magnetic Delay 1.0v – Building Docs

Magnetic Delay – 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 65 rows

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Resistors 28
R11M1M
R2100K100k
R347K47k
R410K10k
R510K10k
R61K1k
R710K10k
R810K10k
R910K10k
R1012K12k
R111K1k
R12100K100k
R1310K10k
R1510K10k
R1610K10k
R171K1k
R184K74.7k
R19220K220k
R204K74.7k
R21220K220k
R22100K100k
R23120K120k
R24120K120k
R25220K220k
R2647K47k
R2747K47k
R3010K10k
R3115K15k
Capacitors 23
C62n22.2n
C922n22n
C112n22.2n
C1222n22n
C13100n100n
C15330n330n
C16100n100n
C17100n100n
C2010n10n
C23100n100n
C21u1u
C31u1u
C51u1u
C71u1u
C81u1u
C1847u47u
C194u74.7u
C2110u10u
C22100u100u
C2447u47u
C25100u100u
C1100n100n
C447n47n
Diodes 5
D11n41481N4148
D21n41481N4148
D51N58171N5817
D6StatusSTATUS
D7RATERATE
ICs 3
IC1OPA2134OPA2134
IC2PT2399PT2399
IC3LM358NLM358N
Potentiometers 6
LEVELB100KB100kPotentiometer
SPEEDB50KB50kPotentiometer
TIMEB50KB50kPotentiometer
DEPTHB100KB100kPotentiometer
FDBKA100KA100kPotentiometer
GAIN100K100kPotentiometer