125B · 3 knobs
TitanDynamic Drive
Based on the Fulltone OCD· 12 other boards clone it
- Category
- Distortion· Overdrive / Distortion
- 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 63 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| 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. |
| Other 9 | ||||
| several | of these chang | OF THESE CHANG | es selectable so you can capture | the main sonic characterics of any version. With one OFF and one ON, it’s equivalent to v1.4. With both OFF, it’s equivalent to the V2 Custom Shop Germanium. e. Default position for v1.7 specs. e clipping stage. position for v1.7 specs. is ON. v1.7 specs. FF, the total is 68n, which does but is a useful in-between value. tion for v1.7 specs. tone cap value to ~22n (v2.0). |
| options, | but if you’re | BUT IF YOU’RE | curious about the other differe | nces then here are the full details for each. |
| 1.1 | Drive | DRIVE | 500kA; Tone 25kA; Volume 100kB; | op-amp capacitor 100n (+BASS set to “ON”); tone capacitor 100n (both +MIDS E set to “ON”) |
| 1.2 | Same | SAME | as v1.1, but Volume 500kB | |
| 1.3 | Drive | DRIVE | 1MA; Tone 10kB; Volume 500kB; o | p-amp capacitor 100n (+BASS set to “ON”); tone capacitor 47n (left +MIDS set o GE clipping (both +GE set to “ON”); C2 and C5 are 330pF (these are 220pf in all |
| 1.4 | Drive | DRIVE | 1MA; Tone 10kB; Volume 500kB; o | p-amp capacitor 68n (+BASS set to “OFF”); tone capacitor 47n (left +MIDS set to metric GE clipping (one +GE set to “OFF” and one set to “ON”) |
| 1.5 | Drive | DRIVE | 1MA; Tone 10kB; Volume 100kA; o | p-amp capacitor 68n (+BASS set to “OFF”); tone capacitor 47n (left +MIDS set to hi-cut capacitor (HI CUT set to “ON”); no GE clipping (both +GE set to “ON”) |
| 1.6 | Drive | DRIVE | 1MA; Tone 10kB; Volume 100kB; o | p-amp capacitor 68n (+BASS set to “OFF”); tone capacitor 47n (left +MIDS set to ve hi-cut capacitor (HI CUT set to “OFF”); no GE clipping (both +GE set to “ON”) |
| 1.7 | Same | SAME | as v1.6 (the version increment w | as due to upgraded filter capacitors). This is the version that is specified in the parts duction the longest. |
Other boards based on the Fulltone OCD
- OCDE Coda Effects · 1590B · €9.00
- Fulltone OCD EfektPol
- Grizzled Grime Effects Layouts · 125B · $9.00
- Fulltone OCD Effects Layouts (blog)
- OCD Guitar-Electronics.eu · €6.25
- Mental Health Drive Moonn Electronics · €5.50
- OCD OP Electronics · 125B · €2.00
- T.O.C. (OCD) PCB Guitar Mania · 125B · €8.90
- T.O.C. (OCD) SMD PCB Guitar Mania · 125B · €18.90
- Fulltone OCD V4 (Stratotrasto) Revolution Deux
- Fulltone OCD - All versions Tagboard Effects
- OCD overdrive Tayda Electronics (DHEA) · $8.00