Akashic Guitar effects circuit lookup
ATTACKSUSTAINVOLUMECLIP

125B · 4 knobs

PCB Guitar Mania

Keepressor

Based on the Keelley compresor

Category
Compressor
Controls
Attack · Sustain · Volume · Clip
Difficulty
Intermediate
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

We all know that the Keeley Compressor is the most acclaimed boutique compressor in the world. The reason is simple; the pedal can make an instrument sound like it’s been professionally recorded assuring you that whether you’re a beginner or a pro, it will take your sound to the next level.

Introduction

Keepressor is a compressor with an expander/sustainer. This means that besides acting as a regular compressor that limits the peaks in your playing, it also adds more and more gain as notes fade out, giving your notes life beyond their natural lifespan. Isn’t that great? A pedal that offers the right amount of sustain and expressive bloom your notes need.

Also, the four knobs version gives you lots of easy-to-reach compression options, so it won’t take you all day trying to find the perfect sound. Let’s check them:

Sustain: Sets the amount of sustain. A good starting point is at about 9 o’clock. At 12 o’clock, you will get a full sound that is a great fit for funk or lead playing, compressing the loudest notes and raising up softer ones. At 3-5 o’clock, you will get a singing sound that feeds back easily. The noise level rises slightly from 3 o’clock onwards.

Volume: Sets output volume level.

Attack: this pedal has an Internal Attack control, designed for bass players with high-output active pickups or active pedal boards with buffers.

Clip: it also has an Input Sensitivity Control, meaning you can use this in your studio to run keyboards, drum machines, drum mics, even master recordings, and other line-level uses. You’ll raise your signal to a new level of sonic awesomeness.

Controls

Potentiometers

• Attack

• Clip

• Sustain

• Volume

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

Keepressor 1v1 – Building Docs

Keepressor – Building Docs

Keepressor – 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 54 rows

Report a wrong parse

Got parts in a drawer? See what you can build with them.

RefValueNormalizedTypeNotes
Resistors 24
R210K10k
R510K10k
R610K10k
R1710K10k
R1810K10k
R15150K150k
R1415K15k
R91K1k
R121K1k
R81M1M
R131M1M
R191M1M
R201M1M
R10220K220k
R1627K27k
R2527K27k
R7390K390k
R22390K390k
R3470K470k
R4470K470k
RLED4K74.7k
R14M74.7M
R1156K56k
R2456K56k
Capacitors 16
C16100n100n
C210n10n
C810n10n
C1110n10n
C1210n10n
C1150p150p
C101n1n
C62n22.2n
C1347n47n
C15100u100u
C1410u10u
C1710u10u
C31u1u
C41u1u
C71u1u
C91u1u
Diodes 3
D11N58171N5817
D31n9141N914
D41n9141N914
Transistors 5
Q12N39042N3904
Q22N39042N3904
Q32N39042N3904
Q42N39042N3904
Q52N39042N3904
ICs 1
IC2LM13700NLM13700N
Potentiometers 4
ATTACK250K CC250k
SUSTAIN500K CC500k
VOLUME50K BB50k
CLIP100K CC100k
LEDs 1
D23mm red LED3MM RED LED