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DRIVETONEVOLUME

125B · 3 knobs

Aion FX

TitanDynamic Drive

Based on the Fulltone OCD· 2 other boards clone it

Category
Distortion· Overdrive / Distortion
Controls
Drive · Tone · Volume
Difficulty
Easy
Price
$12.50in stock

From the vendor

A legendary hard-clipping overdrive pedal that makes almost any rig sound better.

Fulltone and OCD are registered trademarks of Fulltone Musical Products LLC. Any use of these trademarks is for comparative purposes only. Aion FX has no affiliation with Fulltone Musical Products and this DIY project is not endorsed by them.

Project overview

The Titan Dynamic Drive is an adaptation of the legendary Fulltone OCD. The Obsessive Compulsive Drive was first released in 2005, itself a modified version of the Voodoo Labs Overdrive with several added features and tweaks.

There were seven different official versions of V1 from its initial release until it was replaced by the V2 in 2017. Prior to the release of the “true” V2, these versions were referred to by the gear community as V1, V2, V3, etc., but they’ve always been labeled V1.1, V1.2, V1.3, etc. inside the enclosure.

For this project, we’ve brought in the most noticeable circuit tweaks from V1.1 through V1.7 and using DIP switches to make them configurable. The result is a tonal workstation, allowing you to tailor your own perfect version of the circuit.

We’ve included extensive documentation on the major differences between the versions and the switch combinations that correspond most closely to each. The default parts list corresponds to v1.7, which is the version that was in production the longest with around ~75,000 units manufactured.

Schematic

The schematic is in the vendor's build document, page 8. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 54 rows

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RefValueNormalizedTypeNotes
Resistors 16
R110k10kMetal film resistor, 1/4W
R2470k470kMetal film resistor, 1/4W
R318k18kMetal film resistor, 1/4W
R42k22.2kMetal film resistor, 1/4W
R510k10kMetal film resistor, 1/4W
R610k10kMetal film resistor, 1/4W
R7150k150kMetal film resistor, 1/4W
R839k39kMetal film resistor, 1/4W
R933k33kMetal film resistor, 1/4W
R1022k22kMetal film resistor, 1/4W
R111k1kMetal film resistor, 1/4W
R1210k10kMetal film resistor, 1/4W
R1310k10kMetal film resistor, 1/4W
R14100R100Metal film resistor, 1/4WPower supply filter resistor.
RPD1M1MMetal film resistor, 1/4WInput pull-down resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 15
C122n22nFilm capacitor, 7.2 x 2.5mm
C2220pF220pMLCC capacitor, NP0/C0G
C368n68nFilm capacitor, 7.2 x 2.5mm
C41n1nFilm capacitor, 7.2 x 2.5mm
C5220pF220pMLCC capacitor, NP0/C0G
C6100n100nFilm capacitor, 7.2 x 2.5mm
C71uF1uFilm capacitor, 7.2 x 3.5mm
C847n47nFilm capacitor, 7.2 x 2.5mm
C947n47nFilm capacitor, 7.2 x 2.5mm
C1047n47nFilm capacitor, 7.2 x 2.5mm
C1110n10nFilm capacitor, 7.2 x 2.5mm
C1233n33nFilm capacitor, 7.2 x 2.5mm
C1347uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C14100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C15100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 3
D11N58171N5817Schottky diode, DO-41
D2GeGEGermanium diode, DO-7Any germanium diode should work about the same in this circuit, so use
D3GeGEGermanium diode, DO-7whatever you can find. See build notes for precautions about polarity.
Transistors 2
Q12N70002N7000MOSFET, N-channel, TO-92Can also use BS170 (rotate 180 degrees).
Q22N70002N7000MOSFET, N-channel, TO-92Can also use BS170 (rotate 180 degrees).
ICs 1
IC1TL082TL082Operational amplifier, DIP8
Potentiometers 3
DRIVE1MAA1M16mm right-angle PCB mount pot
TONE10kBB10k16mm right-angle PCB mount pot
VOL.100kBB100k16mm right-angle PCB mount pot
Switches 5
SW13-pos. DIP3-POS. DIPDIP switch, 3-positionSee build notes for switch settings.
SW23-pos. DIP3-POS. DIPDIP switch, 3-positionSee build notes for switch settings.
CLIPSPDT on-onSPDT ON-ONToggle switch, SPDT on-on
HP/LPSPDT on-onSPDT ON-ONToggle switch, SPDT on-on
FSW3PDT3PDTStomp switch, 3PDT
LEDs 3
D43mm LED3MM LEDLED, 3mm, red diffusedCan also use 5mm.
D53mm LED3MM LEDLED, 3mm, red diffusedCan also use 5mm.
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 mountMouser 163-4302-E or equivalent.
Hardware 2
BATT.9V9V9V battery snapSoft vinyl type. The hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Fulltone OCD