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DRIVETONEVOLUME

125B · 3 knobs

Aion FX

TellurionDynamic Drive

Based on the Fulltone Full-Drive 1

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

From the vendor

An adaptation of one of the original boutique pedals dating back to 1995, based on the classic Tube Screamer but with several hot-rodded additions.

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 Tellurion Dynamic Drive is an adaptation of the Fulltone Full-Drive 1, often abbreviated as the FD1. It was released in 2018 and traced by Aion FX in 2026.[1]

The original Full-Drive was one of the first hand-made boutique pedals going all the way back to 1995. It was based on the classic Tube Screamer circuit, but with modified clipping diodes and a footswitch that engages a fixed gain boost.

The Full-Drive 1 is not actually a reissue of the original Full-Drive, but instead a new product that is essentially a single-channel FD2 with some tweaks to make it sound more like the late ‘90s units. It leaves off the Boost footswitch, but incorporates the 3-way Mode switch to get two extra settings in addition to the vintage Tube Screamer circuit.

The Tellurion project is an adaptation of the traced Full-Drive 1 with a few additions. The Mode switch is the same as the original, but we’ve added a Clipping switch to select between three different sets of clipping diodes. See build notes in the PDF documentation for options.

Note that while the initial product announcement makes reference to “Enhanced Bypass”, the JFET bypass system first used in the OCD V2, the unit we traced was standard true bypass via a 3PDT switch. The user manual only mentions to true bypass, so it seems there was a last-minute change between the announcement and when it went into production.

Notes & references • No tracing journal for this one since it’s almost identical to the FD2. The schematic in the build doc has an added clipping switch not in the original, but everything else is the same as our trace except for standardizing the power filtering with our other projects. ↩

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 60 rows

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RefValueNormalizedTypeNotes
Resistors 21
R11k1kMetal film resistor, 1/4W
R2510k510kMetal film resistor, 1/4W
R310k10kMetal film resistor, 1/4W
R410k10kMetal film resistor, 1/4W
R518k18kMetal film resistor, 1/4W
R64k74.7kMetal film resistor, 1/4W
R71k1kMetal film resistor, 1/4W
R810k10kMetal film resistor, 1/4W
R9220R220Metal film resistor, 1/4W
R101k1kMetal film resistor, 1/4W
R11150k150kMetal film resistor, 1/4W
R121k1kMetal film resistor, 1/4W
R13510k510kMetal film resistor, 1/4W
R1410k10kMetal film resistor, 1/4W
R15100R100Metal film resistor, 1/4W
R1610k10kMetal film resistor, 1/4W
R1710k10kMetal film resistor, 1/4W
R1810k10kMetal film resistor, 1/4W
R1947R47Metal 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 14
C222n22nFilm capacitor, 7.2 x 2.5mm
C31uF1uFilm capacitor, 7.2 x 5mm
C447pF47pMLCC capacitor, NP0/C0G
C568n68nFilm capacitor, 7.2 x 2.5mm
C6220n220nFilm capacitor, 7.2 x 3mm
C7220n220nFilm capacitor, 7.2 x 3mm
C810n10nFilm capacitor, 7.2 x 2.5mm
C91uF1uFilm capacitor, 7.2 x 5mm
C10100n100nFilm capacitor, 7.2 x 2.5mm
C111uF1uFilm capacitor, 7.2 x 5mm
C1210uF10uElectrolytic capacitor, 5mm
C1347uF47uElectrolytic capacitor, 5mmReference voltage filter resistor.
C14100uF100uElectrolytic capacitor, 6.3mmPower supply filter resistor.
C15100n100nMLCC capacitor, X7RPower supply filter resistor.
Diodes 7
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N40071N4007Rectifier diode, DO-41
D41N34A1N34AGermanium diode, DO-7Any germanium diode should work the same in this circuit, so use
D51N34A1N34AGermanium diode, DO-7whatever you can find. See build notes for precautions about polarity.
D73mm red3MM REDLED, 3mm, red diffused
D83mm red3MM REDLED, 3mm, red diffused
Transistors 4
Q12N50882N5088BJT transistor, NPN, TO-92Can also use BC549C (rotate 180 degrees from silkscreen).
Q22N70002N7000MOSFET, N-channel, TO-92Can also use BS170 (rotate 180 degrees from silkscreen).
Q32N70002N7000MOSFET, N-channel, TO-92Can also use BS170 (rotate 180 degrees from silkscreen).
Q42N50882N5088BJT transistor, NPN, TO-92Can also use BC549C (rotate 180 degrees from silkscreen).
ICs 1
IC1JRC4558DJRC4558DOperational amplifier, DIP8
Potentiometers 3
DRIVE500kAA500k16mm right-angle PCB mount pot
TONE20kWW20k16mm right-angle PCB mount potOriginal uses 25kW, which is not available in small quantities from DIY suppliers. 20kW will perform the same.
VOL.100kAA100k16mm right-angle PCB mount pot
Switches 3
CLIPSPDT cntr offSPDT CNTR OFFToggle switch, SPDT on-off-on
MODEDPDT on-on-on ToDPDT ON-ON-ON TOggle switch, DPDT on-on-onMust be Type 2 configuration See build notes for a diagram.
FSW3PDT3PDTStomp switch, 3PDT
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 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.