Akashic Guitar effects circuit lookup
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Sheepylove· PCB006

Celestial Screamer

Based on the Ibanez Tube Screamer· 34 other boards clone it

Category
Overdrive· OD
Price
€10.00in stock
Buy the PCB at Sheepylove Build document2026-02-21

From the vendor

A great design by Celestial Engineering, aka Chuck D Bones. It takes all that is good with a Tube Screamer, and adds some great tone shaping abilities.

The main circuit is pretty flexible. There’s a boost upfront, followed by a low cut which lets you take out some of that bass when you slam the next gain stages. In between those is a hi-cut which lets you stop the high end from going wild. I look at these as the gain EQ.

After all that, there’s a Baxandall EQ stack! Adjust to your amp and go!

It’s a lot of knobs, but they all do the right things in the right places. It’s my choice when I want to tailor a TS tone.

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 22
R2100100
R3200k200k
R4220k220k
R53M33.3M
R61M1M
R7100k100k
R23100k100k
R8560560
R94k74.7k
R103k93.9k
R1127k27k
R122k22.2k
R222k22.2k
R131k51.5k
R14470470
R1547k47k
R1647k47k
R176k86.8k
R186k86.8k
R206k86.8k
R216k86.8k
R1939k39k
Capacitors 13
C1100u100u
C210u10u
C1310u10u
C322n22n
C42u22.2u
C72u22.2u
C53n93.9n
C647p47p
C847n47n
C939n39n
C1039n39n
C112n22.2n
C12330p330p
Diodes 5
D11N58171N5817
D31N40071N4007
D51N40071N4007
D41N41481N4148
D61N41481N4148
Transistors 1
Q1MMBF4393MMBF4393
ICs 2
IC1TL072TL072Usual dual
IC2TL072TL072Usual dual op-amp suspects can be used. 4558, etc.
Potentiometers 8
POT1A100kA100k
POT2C10kC10k
POT3A500kA500k
POT7A500kA500k
POT4B50kB50k
POT6B100kB100k
POT8B10kB10k
RV15k5k
LEDs 1
D2LEDLED

Other boards based on the Ibanez Tube Screamer