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125B · 3 knobs

Aion FX

CeleritasOrganic Overdrive

Based on the Greer Lightspeed· 2 other boards clone it

Category
Overdrive
Controls
Drive · Tone · Volume
Difficulty
Beginner
Price
$12.50in stock
Buy the PCB at Aion FX Build document1.0.0 (2024-11-29) Mouser parts spreadsheet google

From the vendor

A high-end transparent overdrive with low parts count inspired by the Timmy and Zendrive.

The Celeritas Organic Overdrive is based on the Greer Lightspeed, first released in 2013.

The Lightspeed is a stripped-down transparent overdrive inspired by circuits like the Timmy and Zendrive. The input clipping stage is the same topology as the Tube Screamer, with soft clipping diodes in the feedback loop of the op-amp. This is followed by gain recovery and passive tone shaping that has some resemblance to the OCD, including a treble cut control at the end of the circuit.

While not terribly innovative, the Lightspeed circuit is very carefully tuned and has earned its spot on the pedalboards of many A-list musicians.

The Celeritas is a straightforward adaptation with no modifications other than some tweaks to the power supply for consistency with other Aion FX projects.

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 41 rows

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RefValueNormalizedTypeNotes
Resistors 13
R1430k430kMetal film resistor, 1/4W
R25k65.6kMetal film resistor, 1/4W
R33k33.3kMetal film resistor, 1/4W
R412k12kMetal film resistor, 1/4W
R55k65.6kMetal film resistor, 1/4W
R64k74.7kMetal film resistor, 1/4W
R73k93.9kMetal film resistor, 1/4W
R83k33.3kMetal film resistor, 1/4W
R94k74.7kMetal film resistor, 1/4W
R105k65.6kMetal film resistor, 1/4W
R1147R47Metal film resistor, 1/4WPower supply filter resistor.
RPD2M22.2MMetal film resistor, 1/4WInput pulldown resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 10
C147n47nFilm capacitor, 7.2 x 2.5mm
C2100pF100pMLCC capacitor, NP0/C0G
C3470n470nFilm capacitor, 7.2 x 3mm
C447n47nFilm capacitor, 7.2 x 2.5mm
C510n10nFilm capacitor, 7.2 x 2.5mm
C61uF1uFilm capacitor, 7.2 x 3.5mm
C7220n220nFilm capacitor, 7.2 x 2.5mm
C847uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C9100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C10100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 6
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
D41N9141N914Fast-switching diode, DO-35
D51N9141N914Fast-switching diode, DO-35
D61N9141N914Fast-switching diode, DO-35
ICs 1
IC1OPA2134OPA2134Operational amplifier, dual, DIP8
Potentiometers 3
DRIVE500kAA500k16mm right-angle PCB mount potAudio (log) taper.
TREBLE10kAA10k16mm right-angle PCB mount potAudio (log) taper.
VOLUME100kAA100k16mm right-angle PCB mount potAudio (log) taper.
Switches 1
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 4
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountLumberg NEB/J 21 C or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Greer Lightspeed