125B · 3 knobs
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
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| R1 | 10k | 10k | Metal film resistor, 1/4W | |
| R2 | 470k | 470k | Metal film resistor, 1/4W | |
| R3 | 18k | 18k | Metal film resistor, 1/4W | |
| R4 | 2k2 | 2.2k | Metal film resistor, 1/4W | |
| R5 | 10k | 10k | Metal film resistor, 1/4W | |
| R6 | 10k | 10k | Metal film resistor, 1/4W | |
| R7 | 150k | 150k | Metal film resistor, 1/4W | |
| R8 | 39k | 39k | Metal film resistor, 1/4W | |
| R9 | 33k | 33k | Metal film resistor, 1/4W | |
| R10 | 22k | 22k | Metal film resistor, 1/4W | |
| R11 | 1k | 1k | Metal film resistor, 1/4W | |
| R12 | 10k | 10k | Metal film resistor, 1/4W | |
| R13 | 10k | 10k | Metal film resistor, 1/4W | |
| R14 | 100R | 100 | Metal film resistor, 1/4W | Power supply filter resistor. |
| RPD | 1M | 1M | Metal film resistor, 1/4W | Input pull-down resistor. |
| LEDR | 10k | 10k | Metal film resistor, 1/4W | LED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 15 | ||||
| C1 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 220pF | 220p | MLCC capacitor, NP0/C0G | |
| C3 | 68n | 68n | Film capacitor, 7.2 x 2.5mm | |
| C4 | 1n | 1n | Film capacitor, 7.2 x 2.5mm | |
| C5 | 220pF | 220p | MLCC capacitor, NP0/C0G | |
| C6 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C7 | 1uF | 1u | Film capacitor, 7.2 x 3.5mm | |
| C8 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C9 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 47n | 47n | Film capacitor, 7.2 x 2.5mm | |
| C11 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 47uF | 47u | Electrolytic capacitor, 5mm | Reference voltage filter capacitor. |
| C14 | 100uF | 100u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C15 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| D2 | Ge | GE | Germanium diode, DO-7 | Any germanium diode should work about the same in this circuit, so use |
| D3 | Ge | GE | Germanium diode, DO-7 | whatever you can find. See build notes for precautions about polarity. |
| Transistors 2 | ||||
| Q1 | 2N7000 | 2N7000 | MOSFET, N-channel, TO-92 | Can also use BS170 (rotate 180 degrees). |
| Q2 | 2N7000 | 2N7000 | MOSFET, N-channel, TO-92 | Can also use BS170 (rotate 180 degrees). |
| ICs 1 | ||||
| IC1 | TL082 | TL082 | Operational amplifier, DIP8 | |
| Potentiometers 3 | ||||
| DRIVE | 1MA | A1M | 16mm right-angle PCB mount pot | |
| TONE | 10kB | B10k | 16mm right-angle PCB mount pot | |
| VOL. | 100kB | B100k | 16mm right-angle PCB mount pot | |
| Switches 5 | ||||
| SW1 | 3-pos. DIP | 3-POS. DIP | DIP switch, 3-position | See build notes for switch settings. |
| SW2 | 3-pos. DIP | 3-POS. DIP | DIP switch, 3-position | See build notes for switch settings. |
| CLIP | SPDT on-on | SPDT ON-ON | Toggle switch, SPDT on-on | |
| HP/LP | SPDT on-on | SPDT ON-ON | Toggle switch, SPDT on-on | |
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| LEDs 3 | ||||
| D4 | 3mm LED | 3MM LED | LED, 3mm, red diffused | Can also use 5mm. |
| D5 | 3mm LED | 3MM LED | LED, 3mm, red diffused | Can also use 5mm. |
| LED | 5mm | 5MM | LED, 5mm, red diffused | |
| Jacks & sockets 4 | ||||
| IC1-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IN | 1/4" stereo | 1/4" STEREO | 1/4" phone jack, closed frame | Switchcraft 112BX or equivalent. |
| OUT | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| DC | 2.1mm | 2.1MM | DC jack, 2.1mm panel mount | Mouser 163-4302-E or equivalent. |
| Hardware 2 | ||||
| BATT. | 9V | 9V | 9V battery snap | Soft vinyl type. The hard-shell type will not fit. |
| ENC | 125B | 125B | Enclosure, die-cast aluminum | Can also use a Hammond 1590N1. |
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